Audio gradually becomes out of sync with video on YouTube HTML5 videos after 5–8 minutes

RESOLVED DUPLICATE of bug 1136360

Status

()

Core
Audio/Video
P2
normal
RESOLVED DUPLICATE of bug 1136360
3 years ago
3 years ago

People

(Reporter: Jim, Unassigned)

Tracking

({regression})

38 Branch
x86
Windows 7
regression
Points:
---
Dependency tree / graph

Firefox Tracking Flags

(firefox38 affected, firefox40 affected, firefox41 affected, firefox42 affected, firefox43 affected)

Details

Attachments

(1 attachment)

(Reporter)

Description

3 years ago
Created attachment 8605934 [details]
YouTube HTML5 Player Info

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0
Build ID: 20150508094354

Steps to reproduce:

After Firefox updated to version 38 I began to notice YouTube videos becoming out of sync with the audio after about 8 minutes.  Pausing and resuming the video did not resolve the problem.  Refreshing the page and skipping to the forward to where I left off puts the audio and video back in sync.  Skipping back 10 seconds with the J key also re-syncs the audio and video.


Actual results:

The audio and video become noticeably out of sync after about 8 minutes of playback on long videos.  If a video is very long, after re-syncing the audio in the steps above, it will become out of sync again after another 8 minutes passes.


Expected results:

The audio and video shouldn't get out of sync.  This problem did not occur prior to updating to Firefox 38.
Please post your about:support info. Is this any video or a specific one?
OS: Unspecified → Windows 8.1
Hardware: Unspecified → x86
(Reporter)

Comment 2

3 years ago
It only seems to do it with HTML5 videos.  I installed a plugin called YouTube Flash Video Player, which lets you switch YouTube back to using the Flash player and it doesn't lose sync while using the Flash player.

My about:support:

Application Basics
------------------

Name: Firefox
Version: 38.0.1
Build ID: 20150513174244
Update Channel: release
User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0
Multiprocess Windows: 0/1 (default: false)

Crash Reports for the Last 3 Days
---------------------------------

All Crash Reports

Extensions
----------

Name: Adblock Plus
Version: 2.6.9
Enabled: true
ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}

Name: BetterPrivacy
Version: 1.68
Enabled: true
ID: {d40f5e7b-d2cf-4856-b441-cc613eeffbe3}

Name: ChatZilla
Version: 0.9.91.1
Enabled: true
ID: {59c81df5-4b7a-477b-912d-4e0fdf64e5f2}

Name: DownThemAll!
Version: 2.0.18
Enabled: true
ID: {DDC359D1-844A-42a7-9AA1-88A850A938A8}

Name: Enhanced Steam
Version: 7.3
Enabled: true
ID: jid1-YdiFiTEkQgInxA@jetpack

Name: FoxBleed
Version: 0.1
Enabled: true
ID: jid1-Ni8A2ixlGmYBiw@jetpack

Name: Ghostery
Version: 5.4.5
Enabled: true
ID: firefox@ghostery.com

Name: Greasemonkey
Version: 3.1
Enabled: true
ID: {e4a8a97b-f2ed-450b-b12d-ee082ba24781}

Name: Hover Hound
Version: 1.4.3
Enabled: true
ID: jid0-PEBvWWKP6g5gzvk2gsdrh097hv0@jetpack

Name: HTTPS-Everywhere
Version: 5.0.4
Enabled: true
ID: https-everywhere@eff.org

Name: Self-Destructing Cookies
Version: 0.4.7
Enabled: true
ID: jid0-9XfBwUWnvPx4wWsfBWMCm4Jj69E@jetpack

Name: YouTube Flash Video Player
Version: 37.0
Enabled: false
ID: {f3bd3dd2-2888-44c5-91a2-2caeb33fb898}

Graphics
--------

Adapter Description: NVIDIA GeForce GTX 970
Adapter Drivers: nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
Adapter RAM: 4095
ClearType Parameters: D [ Gamma: 2200 Pixel Structure: R ClearType Level: 50 Enhanced Contrast: 0 ] D [ Gamma: 2200 Pixel Structure: R ClearType Level: 100 Enhanced Contrast: 100 ]
Device ID: 0x13c2
Direct2D Enabled: true
DirectWrite Enabled: true (6.1.7601.18834)
Driver Date: 4-8-2015
Driver Version: 9.18.13.5012
GPU #2 Active: false
GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC)
Subsys ID: 29783842
Vendor ID: 0x10de
WebGL Renderer: Google Inc. -- ANGLE (NVIDIA GeForce GTX 970 Direct3D9Ex vs_3_0 ps_3_0)
windowLayerManagerRemote: true
AzureCanvasBackend: direct2d
AzureContentBackend: direct2d
AzureFallbackCanvasBackend: cairo
AzureSkiaAccelerated: 0

Important Modified Preferences
------------------------------

accessibility.typeaheadfind.flashBar: 0
browser.cache.disk.capacity: 51200
browser.cache.disk.smart_size_cached_value: 1048576
browser.cache.disk.smart_size.enabled: false
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.cache.frecency_experiment: 2
browser.download.importedFromSqlite: true
browser.places.smartBookmarksVersion: 7
browser.search.useDBForOrder: true
browser.sessionstore.upgradeBackup.latestBuildID: 20150513174244
browser.startup.homepage: https://www.google.com/
browser.startup.homepage_override.buildID: 20150513174244
browser.startup.homepage_override.mstone: 38.0.1
browser.tabs.closeButtons: 0
browser.tabs.drawInTitlebar: false
dom.mozApps.used: true
dom.w3c_touch_events.expose: false
extensions.lastAppVersion: 38.0.1
font.internaluseonly.changed: false
gfx.direct3d.last_used_feature_level_idx: 0
gfx.direct3d.prefer_10_1: true
javascript.options.showInConsole: false
media.eme.enabled: false
media.gmp-gmpopenh264.lastUpdate: 1431499907
media.gmp-gmpopenh264.version: 1.4
media.gmp-manager.buildID: 20150513174244
media.gmp-manager.lastCheck: 1431918225
network.cookie.prefsMigrated: true
network.predictor.cleaned-up: true
places.database.lastMaintenance: 1431932171
places.history.expiration.transient_current_max_pages: 104858
places.history.expiration.transient_optimal_database_size: 167772160
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
plugin.state.flash: 1
plugin.state.np32dsw: 1
plugin.state.npunity3d: 1
print.print_printer: Samsung SCX-4100 Series
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print.printer_Microsoft_XPS_Document_Writer.print_headerright:
print.printer_Microsoft_XPS_Document_Writer.print_in_color: true
print.printer_Microsoft_XPS_Document_Writer.print_margin_bottom: 0.5
print.printer_Microsoft_XPS_Document_Writer.print_margin_left: 0.5
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print.printer_Microsoft_XPS_Document_Writer.print_oddpages: true
print.printer_Microsoft_XPS_Document_Writer.print_orientation: 0
print.printer_Microsoft_XPS_Document_Writer.print_page_delay: 50
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print.printer_Microsoft_XPS_Document_Writer.print_paper_name:
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print.printer_Microsoft_XPS_Document_Writer.print_paper_width: 8.50
print.printer_Microsoft_XPS_Document_Writer.print_plex_name:
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print.printer_Microsoft_XPS_Document_Writer.print_resolution_name:
print.printer_Microsoft_XPS_Document_Writer.print_reversed: false
print.printer_Microsoft_XPS_Document_Writer.print_scaling: 1.00
print.printer_Microsoft_XPS_Document_Writer.print_shrink_to_fit: true
print.printer_Microsoft_XPS_Document_Writer.print_to_file: false
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print.printer_Samsung_SCX-4100_Series.print_bgcolor: false
print.printer_Samsung_SCX-4100_Series.print_bgimages: false
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print.printer_Samsung_SCX-4100_Series.print_headerright:
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print.printer_Samsung_SCX-4100_Series.print_paper_size_type: 0
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print.printer_Samsung_SCX-4100_Series.print_paper_width: 8.50
print.printer_Samsung_SCX-4100_Series.print_reversed: false
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print.printer_Samsung_SCX-4100_Series.print_shrink_to_fit: true
print.printer_Samsung_SCX-4100_Series.print_to_file: false
print.printer_Samsung_SCX-4100_Series.print_unwriteable_margin_bottom: 0
print.printer_Samsung_SCX-4100_Series.print_unwriteable_margin_left: 0
print.printer_Samsung_SCX-4100_Series.print_unwriteable_margin_right: 0
print.printer_Samsung_SCX-4100_Series.print_unwriteable_margin_top: 0
privacy.cpd.extensions-betterprivacy: true
privacy.cpd.extensions-dta: true
privacy.cpd.offlineApps: true
privacy.cpd.siteSettings: true
privacy.donottrackheader.enabled: true
privacy.donottrackheader.value: 1
privacy.sanitize.migrateFx3Prefs: true
privacy.sanitize.timeSpan: 0
security.tls.version.max: 1
security.warn_viewing_mixed: false
storage.vacuum.last.index: 1
storage.vacuum.last.places.sqlite: 1431506845

Important Locked Preferences
----------------------------

JavaScript
----------

Incremental GC: true

Accessibility
-------------

Activated: false
Prevent Accessibility: 0

Library Versions
----------------

NSPR
Expected minimum version: 4.10.8
Version in use: 4.10.8

NSS
Expected minimum version: 3.18.1 Basic ECC
Version in use: 3.18.1 Basic ECC

NSSSMIME
Expected minimum version: 3.18.1 Basic ECC
Version in use: 3.18.1 Basic ECC

NSSSSL
Expected minimum version: 3.18.1 Basic ECC
Version in use: 3.18.1 Basic ECC

NSSUTIL
Expected minimum version: 3.18.1
Version in use: 3.18.1

Experimental Features
---------------------
OS: Windows 8.1 → Windows 10
(Reporter)

Updated

3 years ago
OS: Windows 10 → Windows 7
Chris any ideas?
Flags: needinfo?(cpeterson)
Jim: does this audio problem happen for all videos over 8 minutes? If it happens for specific videos, can you share a link?

You might try flipping your "media.hardware-video-decoding.enabled" or ("media.windows-media-foundation.use-dxva" about:config prefs to false. Maybe Firefox's software audio decoding is out of sync with the GPU video decoding.

This sounds like an MSE bug. MSE was enabled intermittently during Firefox 37, but Firefox 38 was when YouTube turned it on for all Windows Vista+ users.

Anthony: do you know of any MSE audio sync bugs in Firefox 38?
Blocks: 1083588
status-firefox38: --- → affected
Flags: needinfo?(cpeterson) → needinfo?(ajones)
Keywords: regression
It may be related to bug 1136360.
Flags: needinfo?(ajones)
(Reporter)

Comment 6

3 years ago
Yes it happens on all long videos.  The audio doesn't suddenly go out of sync at 8 minutes, it gradually goes out of sync and becomes noticeable around 8 minutes, though now that I'm aware of it I notice it as early as 5-6 minutes.  I've only noticed it on YouTube, though I don't think I've watched any videos recently on other video services that use HTML5 video players.

I looked in about:config and I didn't have a "media.hardware-video-decoding.enabled" option, but I did have "media.windows-media-foundation.use-dxva" which I toggled to false.  It didn't have any effect though.

I tried starting in safe mode, which didn't work, so I created a new clean profile and that also didn't work.  Here is the about:support from the new, clean profile:

Application Basics
------------------

Name: Firefox
Version: 38.0.1
Build ID: 20150513174244
Update Channel: release
User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0
Multiprocess Windows: 0/1 (default: false)

Crash Reports for the Last 3 Days
---------------------------------

All Crash Reports

Extensions
----------

Graphics
--------

Adapter Description: NVIDIA GeForce GTX 970
Adapter Drivers: nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
Adapter RAM: 4095
ClearType Parameters: D [ Gamma: 2200 Pixel Structure: R ClearType Level: 50 Enhanced Contrast: 0 ] D [ Gamma: 2200 Pixel Structure: R ClearType Level: 100 Enhanced Contrast: 100 ]
Device ID: 0x13c2
Direct2D Enabled: true
DirectWrite Enabled: true (6.1.7601.18834)
Driver Date: 4-8-2015
Driver Version: 9.18.13.5012
GPU #2 Active: false
GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC)
Subsys ID: 29783842
Vendor ID: 0x10de
WebGL Renderer: Google Inc. -- ANGLE (NVIDIA GeForce GTX 970 Direct3D9Ex vs_3_0 ps_3_0)
windowLayerManagerRemote: true
AzureCanvasBackend: direct2d
AzureContentBackend: direct2d
AzureFallbackCanvasBackend: cairo
AzureSkiaAccelerated: 0

Important Modified Preferences
------------------------------

browser.cache.disk.capacity: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.frecency_experiment: 3
browser.download.importedFromSqlite: true
browser.places.smartBookmarksVersion: 7
browser.startup.homepage_override.buildID: 20150513174244
browser.startup.homepage_override.mstone: 38.0.1
extensions.lastAppVersion: 38.0.1
gfx.direct3d.last_used_feature_level_idx: 0
media.gmp-eme-adobe.lastUpdate: 1432032646
media.gmp-eme-adobe.version: 9
media.gmp-gmpopenh264.lastUpdate: 1432032646
media.gmp-gmpopenh264.version: 1.4
media.gmp-manager.buildID: 20150513174244
media.gmp-manager.lastCheck: 1432032643
network.cookie.prefsMigrated: true
network.predictor.cleaned-up: true
places.database.lastMaintenance: 1432033008
places.history.expiration.transient_current_max_pages: 104858
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
plugin.state.flash: 1
plugin.state.npunity3d: 1
privacy.sanitize.migrateFx3Prefs: true
storage.vacuum.last.index: 0
storage.vacuum.last.places.sqlite: 1432033008

Important Locked Preferences
----------------------------

JavaScript
----------

Incremental GC: true

Accessibility
-------------

Activated: false
Prevent Accessibility: 0

Library Versions
----------------

NSPR
Expected minimum version: 4.10.8
Version in use: 4.10.8

NSS
Expected minimum version: 3.18.1 Basic ECC
Version in use: 3.18.1 Basic ECC

NSSSMIME
Expected minimum version: 3.18.1 Basic ECC
Version in use: 3.18.1 Basic ECC

NSSSSL
Expected minimum version: 3.18.1 Basic ECC
Version in use: 3.18.1 Basic ECC

NSSUTIL
Expected minimum version: 3.18.1
Version in use: 3.18.1

Experimental Features
---------------------

Comment 7

3 years ago
I have exactly the same problem. It started to happen with Firefox 38.0, 38.0.1 didn't fix it. Using the HTML5 YouTube player on Firefox 37 did NOT show that bug. Contary to Jim I am using Windows 8.1 x64, but I also have an Nvidia card (although a different one) with the newest driver. I am using a Creative card for audio, if that information also helps.

Here is my about:support (it's in German, I hope that's not a problem):
Allgemeine Informationen
------------------------

Name: Firefox
Version: 38.0.1
Build-ID: 20150513174244
Update-Kanal: release
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0
Fenster mit mehreren Prozessen: 0/1 (Standard: false)

Absturzberichte der letzten 3 Tage
----------------------------------

Alle Absturzberichte

Erweiterungen
-------------

Name: Adblock Plus
Version: 2.6.9
Aktiviert: true
ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}

Name: Flagfox
Version: 5.0.15
Aktiviert: true
ID: {1018e4d6-728f-4b20-ad56-37578a4de76b}

Name: Greasemonkey
Version: 3.1
Aktiviert: true
ID: {e4a8a97b-f2ed-450b-b12d-ee082ba24781}

Name: HTTPS-Everywhere
Version: 5.0.4
Aktiviert: true
ID: https-everywhere@eff.org

Name: RefControl
Version: 0.8.17
Aktiviert: true
ID: {455D905A-D37C-4643-A9E2-F6FEFAA0424A}

Name: Smartest Bookmarks Bar
Version: 1.11
Aktiviert: true
ID: {b442f4c0-c292-4998-aabe-48608a73ba75}

Name: Tab Wheel Scroll
Version: 20140723
Aktiviert: true
ID: tabscroll@mthamil

Name: YouTube High Definition
Version: 37.1
Aktiviert: true
ID: {7b1bf0b6-a1b9-42b0-b75d-252036438bdc}

Name: Video DownloadHelper
Version: 5.2.0
Aktiviert: false
ID: {b9db16a4-6edc-47ec-a1f4-b86292ed211d}

Grafik
------

Direct2D aktiviert: true
DirectWrite aktiviert: true (6.3.9600.17795)
Geräte-ID: 0x1183
GPU #2 aktiv: false
GPU-beschleunigte Fenster: 1/1 Direct3D 11 (OMTC)
Karten-Beschreibung: NVIDIA GeForce GTX 660 Ti
Karten-RAM: 2048
Karten-Treiber: nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
Subsys-ID: 00000000
Treiber-Datum: 5-11-2015
Treiber-Version: 9.18.13.5286
Vendor-ID: 0x10de
WebGL-Renderer: Google Inc. -- ANGLE (NVIDIA GeForce GTX 660 Ti Direct3D11 vs_5_0 ps_5_0)
windowLayerManagerRemote: true
AzureCanvasBackend: direct2d 1.1
AzureContentBackend: direct2d 1.1
AzureFallbackCanvasBackend: cairo
AzureSkiaAccelerated: 0

Wichtige modifizierte Einstellungen
-----------------------------------

accessibility.blockautorefresh: true
accessibility.typeaheadfind.flashBar: 0
browser.cache.disk.capacity: 358400
browser.cache.disk.smart_size_cached_value: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.cache.frecency_experiment: 2
browser.download.folderList: 2
browser.download.importedFromSqlite: true
browser.places.smartBookmarksVersion: 7
browser.search.useDBForOrder: true
browser.sessionstore.upgradeBackup.latestBuildID: 20150513174244
browser.startup.homepage: **REMOVED**
browser.startup.homepage_override.buildID: 20150513174244
browser.startup.homepage_override.mstone: 38.0.1
browser.tabs.warnOnClose: false
dom.mozApps.used: true
dom.w3c_touch_events.expose: false
extensions.lastAppVersion: 38.0.1
font.internaluseonly.changed: true
gfx.direct3d.checkDX10: true
gfx.direct3d.last_used_feature_level_idx: 0
gfx.direct3d.prefer_10_1: true
media.eme.enabled: false
media.gmp-gmpopenh264.lastUpdate: 1431462094
media.gmp-gmpopenh264.version: 1.4
media.gmp-manager.buildID: 20150513174244
media.gmp-manager.lastCheck: 1431955849
network.cookie.cookieBehavior: 1
network.cookie.lifetimePolicy: 2
network.cookie.prefsMigrated: true
network.dns.disablePrefetch: true
network.predictor.cleaned-up: true
network.prefetch-next: false
places.database.lastMaintenance: 1431982044
places.history.expiration.transient_current_max_pages: 104858
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
plugin.state.npadobeaamdetect: 0
plugin.state.npmeetingjoinpluginoc: 0
plugin.state.nppdf: 0
plugin.state.npspwrap: 0
privacy.clearOnShutdown.cookies: false
privacy.clearOnShutdown.downloads: false
privacy.clearOnShutdown.history: false
privacy.clearOnShutdown.offlineApps: true
privacy.clearOnShutdown.passwords: true
privacy.donottrackheader.enabled: true
privacy.sanitize.migrateFx3Prefs: true
privacy.sanitize.sanitizeOnShutdown: true
security.disable_button.openCertManager: false
security.disable_button.openDeviceManager: false
storage.vacuum.last.index: 1
storage.vacuum.last.places.sqlite: 1431462453

Wichtige nicht veränderbare Einstellungen
-----------------------------------------

JavaScript
----------

Inkrementelle GC: true

Barrierefreiheit
----------------

Aktiviert: false
Barrierefreiheit verhindern: 0

Bibliotheken-Versionen
----------------------

NSPR
Minimal vorausgesetzte Version: 4.10.8
Verwendete Version: 4.10.8

NSS
Minimal vorausgesetzte Version: 3.18.1 Basic ECC
Verwendete Version: 3.18.1 Basic ECC

NSSSMIME
Minimal vorausgesetzte Version: 3.18.1 Basic ECC
Verwendete Version: 3.18.1 Basic ECC

NSSSSL
Minimal vorausgesetzte Version: 3.18.1 Basic ECC
Verwendete Version: 3.18.1 Basic ECC

NSSUTIL
Minimal vorausgesetzte Version: 3.18.1
Verwendete Version: 3.18.1

Experimentelle Funktionen
-------------------------

Comment 8

3 years ago
Can confirm, v37 was perfect, 38 broke something. Seems to only happen to sub 60fps videos though. Have yes to see out of sync 60fps one. As for example video it happens and easy to see http://www.youtube.com/watch?v=xrsUMEbLtOs

Support info (Browser is Waterfox 38):
Application Basics
------------------

Name: Firefox
Version: 38.0
Build ID: 20150512005755
Update Channel: release
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:38.0) Gecko/20100101 Firefox/38.0
Multiprocess Windows: 0/1 (default: false)

Crash Reports for the Last 3 Days
---------------------------------

All Crash Reports

Extensions
----------

Name: Add to Search Bar
Version: 2.8
Enabled: true
ID: add-to-searchbox@maltekraus.de

Name: All-in-One Sidebar
Version: 0.7.25
Enabled: true
ID: {097d3191-e6fa-4728-9826-b533d755359d}

Name: Classic Theme Restorer
Version: 1.3.2
Enabled: true
ID: ClassicThemeRestorer@ArisT2Noia4dev

Name: Context Search
Version: 0.6.3
Enabled: true
ID: {902D2C4A-457A-4EF9-AD43-7014562929FF}

Name: Custom Buttons
Version: 0.0.5.8
Enabled: true
ID: custombuttons@xsms.org

Name: Enhanced Steam
Version: 5.9.1
Enabled: true
ID: jid0-SmvlvxGpvCyG252KbVMqIKR79Uc@jetpack

Name: Fast Dial
Version: 4.12
Enabled: true
ID: fastdial@telega.phpnet.us

Name: Feed Sidebar
Version: 8.0.4
Enabled: true
ID: feedbar@efinke.com

Name: Google Image Search
Version: 1.15
Enabled: true
ID: {73007fef-a6e0-47d3-b4e7-dfc116ed6f65}

Name: GPU Accelerated Flash Player
Version: 1.32
Enabled: true
ID: gpuacceleratedflashplayer@stas

Name: Greasemonkey
Version: 3.1
Enabled: true
ID: {e4a8a97b-f2ed-450b-b12d-ee082ba24781}

Name: HDS Link Detector
Version: 0.6
Enabled: true
ID: jid0-HFFmJoceGjTSKDBEWPpzfX9By7I@jetpack

Name: Mozilla Archive Format
Version: 3.1.0
Enabled: true
ID: {7f57cf46-4467-4c2d-adfa-0cba7c507e54}

Name: Nimbus Screen Capture - editable screenshots.
Version: 6.4.1
Enabled: true
ID: nimbusscreencaptureff@everhelper.me

Name: Reddit Enhancement Suite
Version: 4.5.4.1-signed
Enabled: true
ID: jid1-xUfzOsOFlzSOXg@jetpack

Name: Tab Mix Plus
Version: 0.4.1.7
Enabled: true
ID: {dc572301-7619-498c-a57d-39143191b318}

Name: uBlock₀
Version: 0.9.3.1
Enabled: true
ID: {2b10c1c8-a11f-4bad-fe9c-1c11e82cac42}

Name: YouTube Center Developer Build
Version: 525
Enabled: true
ID: jid1-cwbvBTE216jjpg@jetpack

Name: Adblock Edge
Version: 2.1.9
Enabled: false
ID: {fe272bd1-5f76-4ea4-8501-a05d35d823fc}

Name: Awesome screenshot: Capture and Annotate
Version: 2.4.9
Enabled: false
ID: jid0-GXjLLfbCoAx0LcltEdFrEkQdQPI@jetpack

Name: Exif Viewer
Version: 2.00
Enabled: false
ID: exif_viewer@mozilla.doslash.org

Name: h264ify
Version: 1.0.0
Enabled: false
ID: jid1-TSgSxBhncsPBWQ@jetpack

Name: Hola Better Internet
Version: 1.7.824
Enabled: false
ID: jid1-4P0kohSJxU1qGg@jetpack

Name: OmniSidebar
Version: 1.5.4
Enabled: false
ID: osb@quicksaver

Name: Reddited
Version: 2.0
Enabled: false
ID: jid1-o6Fu4SiUcHDCsw@jetpack

Name: RuCrash Extension
Version: 1.0
Enabled: false
ID: {54A49BCD-E2F2-4E06-B165-D29BF3E8BE00}

Name: Transmogrify for Plex
Version: 1.3.4
Enabled: false
ID: transmogrifyforplex@moussekateer

Name: YouTube Enhancer Plus
Version: 3.3.6
Enabled: false
ID: firefoxaddon@youtubeenhancer.com

Graphics
--------

Adapter Description: NVIDIA GeForce GTX 780
Adapter Drivers: nvd3dumx,nvwgf2umx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um,nvwgf2um
Adapter RAM: 3072
Device ID: 0x1004
Direct2D Enabled: true
DirectWrite Enabled: true (10.0.10074.0)
Driver Date: 5-10-2015
Driver Version: 9.18.13.5284
GPU #2 Active: false
GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC)
Subsys ID: 10041569
Vendor ID: 0x10de
WebGL Renderer: Google Inc. -- ANGLE (NVIDIA GeForce GTX 780 Direct3D11 vs_5_0 ps_5_0)
windowLayerManagerRemote: true
AzureCanvasBackend: direct2d 1.1
AzureContentBackend: direct2d 1.1
AzureFallbackCanvasBackend: cairo
AzureSkiaAccelerated: 0

Important Modified Preferences
------------------------------

accessibility.typeaheadfind.flashBar: 0
browser.cache.disk.capacity: 358400
browser.cache.disk.smart_size_cached_value: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.cache.frecency_experiment: 4
browser.download.folderList: 2
browser.download.importedFromSqlite: true
browser.download.manager.alertOnEXEOpen: false
browser.download.manager.showWhenStarting: false
browser.download.useDownloadDir: false
browser.link.open_newwindow.override.external: 3
browser.places.smartBookmarksVersion: 7
browser.search.useDBForOrder: true
browser.sessionstore.max_tabs_undo: 20
browser.sessionstore.upgradeBackup.latestBuildID: 20150511212419
browser.startup.homepage_override.buildID: 20150511212419
browser.startup.homepage_override.mstone: 38.0
browser.tabs.closeWindowWithLastTab: false
browser.tabs.selectOwnerOnClose: false
browser.tabs.tabMaxWidth: 176
browser.tabs.tabMinWidth: 30
browser.tabs.warnOnClose: false
dom.mozApps.used: true
extensions.lastAppVersion: 38.0
font.internaluseonly.changed: true
gfx.direct3d.last_used_feature_level_idx: 0
media.gmp-gmpopenh264.lastUpdate: 1431620393
media.gmp-gmpopenh264.version: 1.4
media.gmp-manager.buildID: 20150511212419
media.gmp-manager.lastCheck: 1432042962
media.mediasource.webm.enabled: false
mousewheel.default.delta_multiplier_y: 300
network.cookie.prefsMigrated: true
network.predictor.cleaned-up: true
places.database.lastMaintenance: 1431688323
places.history.expiration.transient_current_max_pages: 104858
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
print.printer_Canon_MG3500_series_Printer.print_bgcolor: false
print.printer_Canon_MG3500_series_Printer.print_bgimages: false
print.printer_Canon_MG3500_series_Printer.print_colorspace:
print.printer_Canon_MG3500_series_Printer.print_command:
print.printer_Canon_MG3500_series_Printer.print_downloadfonts: false
print.printer_Canon_MG3500_series_Printer.print_duplex: 1515870810
print.printer_Canon_MG3500_series_Printer.print_edge_bottom: 0
print.printer_Canon_MG3500_series_Printer.print_edge_left: 0
print.printer_Canon_MG3500_series_Printer.print_edge_right: 0
print.printer_Canon_MG3500_series_Printer.print_edge_top: 0
print.printer_Canon_MG3500_series_Printer.print_evenpages: true
print.printer_Canon_MG3500_series_Printer.print_footercenter:
print.printer_Canon_MG3500_series_Printer.print_footerleft: &PT
print.printer_Canon_MG3500_series_Printer.print_footerright: &D
print.printer_Canon_MG3500_series_Printer.print_headercenter:
print.printer_Canon_MG3500_series_Printer.print_headerleft: &T
print.printer_Canon_MG3500_series_Printer.print_headerright: &U
print.printer_Canon_MG3500_series_Printer.print_in_color: true
print.printer_Canon_MG3500_series_Printer.print_margin_bottom: 0.5
print.printer_Canon_MG3500_series_Printer.print_margin_left: 0.5
print.printer_Canon_MG3500_series_Printer.print_margin_right: 0.5
print.printer_Canon_MG3500_series_Printer.print_margin_top: 0.5
print.printer_Canon_MG3500_series_Printer.print_oddpages: true
print.printer_Canon_MG3500_series_Printer.print_orientation: 0
print.printer_Canon_MG3500_series_Printer.print_page_delay: 50
print.printer_Canon_MG3500_series_Printer.print_paper_data: 9
print.printer_Canon_MG3500_series_Printer.print_paper_height: 11,00
print.printer_Canon_MG3500_series_Printer.print_paper_name:
print.printer_Canon_MG3500_series_Printer.print_paper_size_type: 0
print.printer_Canon_MG3500_series_Printer.print_paper_size_unit: 1
print.printer_Canon_MG3500_series_Printer.print_paper_width: 8,50
print.printer_Canon_MG3500_series_Printer.print_plex_name:
print.printer_Canon_MG3500_series_Printer.print_resolution: 1515870810
print.printer_Canon_MG3500_series_Printer.print_resolution_name:
print.printer_Canon_MG3500_series_Printer.print_reversed: false
print.printer_Canon_MG3500_series_Printer.print_scaling: 1,00
print.printer_Canon_MG3500_series_Printer.print_shrink_to_fit: true
print.printer_Canon_MG3500_series_Printer.print_to_file: false
print.printer_Canon_MG3500_series_Printer.print_unwriteable_margin_bottom: 0
print.printer_Canon_MG3500_series_Printer.print_unwriteable_margin_left: 0
print.printer_Canon_MG3500_series_Printer.print_unwriteable_margin_right: 0
print.printer_Canon_MG3500_series_Printer.print_unwriteable_margin_top: 0
privacy.sanitize.migrateFx3Prefs: true
storage.vacuum.last.index: 1
storage.vacuum.last.places.sqlite: 1431011155
webgl.force-enabled: true

Important Locked Preferences
----------------------------

JavaScript
----------

Incremental GC: true

Accessibility
-------------

Activated: false
Prevent Accessibility: 0

Library Versions
----------------

NSPR
Expected minimum version: 4.10.8
Version in use: 4.10.8

NSS
Expected minimum version: 3.18.1 Basic ECC
Version in use: 3.18.1 Basic ECC

NSSSMIME
Expected minimum version: 3.18.1 Basic ECC
Version in use: 3.18.1 Basic ECC

NSSSSL
Expected minimum version: 3.18.1 Basic ECC
Version in use: 3.18.1 Basic ECC

NSSUTIL
Expected minimum version: 3.18.1
Version in use: 3.18.1

Experimental Features
---------------------

Comment 9

3 years ago
This still happens with Firefox 38.0.5 released today.

Comment 10

3 years ago
Can confirm, this happens on 38.0.5.

Comment 11

3 years ago
Confirming what the other two comments are saying. Still happens for long videos. Here's an additional about:support for 38.0.5

Application Basics
------------------

Name: Firefox
Version: 38.0.5
Build ID: 20150525141253
Update Channel: release
User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0
Multiprocess Windows: 0/1 (default: false)

Crash Reports for the Last 3 Days
---------------------------------

All Crash Reports     Extensions
--------------------------------

Name: Adblock Plus
Version: 2.6.9.1-signed
Enabled: true
ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}

Name: Adobe Acrobat - Create PDF
Version: 1.2
Enabled: true
ID: web2pdfextension@web2pdf.adobedotcom

Name: BetterTTV
Version: 6.6
Enabled: true
ID: jid0-OeCFXKAPh2tC0bN3Li9ajRAZx6c@jetpack

Name: Brief
Version: 2.0b3
Enabled: true
ID: brief@mozdev.org

Name: Flagfox
Version: 5.1.0
Enabled: true
ID: {1018e4d6-728f-4b20-ad56-37578a4de76b}

Name: Google Similar Images
Version: 0.5.1-signed
Enabled: true
ID: nishan.naseer.googimagesearch@gmail.com

Name: Greasemonkey
Version: 3.2
Enabled: true
ID: {e4a8a97b-f2ed-450b-b12d-ee082ba24781}

Name: IDM CC
Version: 7.3.100
Enabled: true
ID: mozilla_cc@internetdownloadmanager.com

Name: LastPass
Version: 3.1.95
Enabled: true
ID: support@lastpass.com

Name: MEGA
Version: 2.0.223
Enabled: true
ID: firefox@mega.co.nz

Name: NoScript
Version: 2.6.9.26
Enabled: true
ID: {73a6fe31-595d-460b-a920-fcc0f8843232}

Name: Reddit Enhancement Suite
Version: 4.5.4.1-signed
Enabled: true
ID: jid1-xUfzOsOFlzSOXg@jetpack

Name: Rikaichan
Version: 2.09.1-signed
Enabled: true
ID: {0AA9101C-D3C1-4129-A9B7-D778C6A17F82}

Name: Rikaichan Japanese Names Dictionary File
Version: 2.01.150401
Enabled: true
ID: rikaichan-jpnames@polarcloud.com

Name: Rikaichan Japanese-English Dictionary File
Version: 2.01.150401
Enabled: true
ID: rikaichan-jpen@polarcloud.com

Name: Save Image in Folder
Version: 1.3.16.1-signed
Enabled: true
ID: {5e594888-3e8e-47da-b2c6-b0b545112f84}

Name: Twitter App
Version: 38.0-signed
Enabled: true
ID: {12b6fdcd-4423-4276-82a3-73fdbff5f7e4}

Name: Xmarks
Version: 4.3.7
Enabled: true
ID: foxmarks@kei.com

Graphics
--------

Adapter Description: NVIDIA GeForce GTX 770
Adapter Drivers: nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
Adapter RAM: 2048
Device ID: 0x1184
Direct2D Enabled: true
DirectWrite Enabled: true (6.2.9200.17292)
Driver Date: 5-11-2015
Driver Version: 9.18.13.5286
GPU #2 Active: false
GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC)
Subsys ID: 36031458
Vendor ID: 0x10de
WebGL Renderer: Google Inc. -- ANGLE (NVIDIA GeForce GTX 770 Direct3D11 vs_5_0 ps_5_0)
windowLayerManagerRemote: true
AzureCanvasBackend: direct2d 1.1
AzureContentBackend: direct2d 1.1
AzureFallbackCanvasBackend: cairo
AzureSkiaAccelerated: 0
(#0) Error: [D2D1.1] 4CreateBitmap failure Size(32,24914) Code: 0x80070057
(#8) Error: [D2D1.1] 4CreateBitmap failure Size(32,24914) Code: 0x80070057
(#9) Error: [D2D1.1] 4CreateBitmap failure Size(32,24914) Code: 0x80070057
(#10) Error: [D2D1.1] 4CreateBitmap failure Size(32,24914) Code: 0x80070057
(#11) Error: [D2D1.1] 4CreateBitmap failure Size(32,24914) Code: 0x80070057
(#12) Error: [D2D1.1] 4CreateBitmap failure Size(32,24914) Code: 0x80070057

Important Modified Preferences
------------------------------

accessibility.typeaheadfind.flashBar: 0
browser.cache.disk.capacity: 358400
browser.cache.disk.smart_size_cached_value: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.cache.frecency_experiment: 4
browser.download.importedFromSqlite: true
browser.newtab.url: about:blank
browser.places.smartBookmarksVersion: 7
browser.search.useDBForOrder: true
browser.sessionstore.upgradeBackup.latestBuildID: 20150525141253
browser.startup.homepage_override.buildID: 20150525141253
browser.startup.homepage_override.mstone: 38.0.5
browser.tabs.onTop: false
browser.tabs.warnOnClose: false
dom.disable_open_during_load: false
dom.max_chrome_script_run_time: 40
dom.max_script_run_time: 40
dom.mozApps.used: true
extensions.lastAppVersion: 38.0.5
font.internaluseonly.changed: true
gfx.direct3d.last_used_feature_level_idx: 0
media.gmp-eme-adobe.lastUpdate: 1433166577
media.gmp-eme-adobe.version: 10
media.gmp-gmpopenh264.lastUpdate: 1431823873
media.gmp-gmpopenh264.version: 1.4
media.gmp-manager.buildID: 20150525141253
media.gmp-manager.lastCheck: 1433995205
network.cookie.prefsMigrated: true
network.predictor.cleaned-up: true
places.database.lastMaintenance: 1433944315
places.history.expiration.transient_current_max_pages: 104858
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
plugin.state.npvlc: 2
print.printer_EPSONA93529_(XP-410_Series).print_bgcolor: false
print.printer_EPSONA93529_(XP-410_Series).print_bgimages: false
print.printer_EPSONA93529_(XP-410_Series).print_colorspace:
print.printer_EPSONA93529_(XP-410_Series).print_command:
print.printer_EPSONA93529_(XP-410_Series).print_downloadfonts: false
print.printer_EPSONA93529_(XP-410_Series).print_duplex: 4259908
print.printer_EPSONA93529_(XP-410_Series).print_edge_bottom: 0
print.printer_EPSONA93529_(XP-410_Series).print_edge_left: 0
print.printer_EPSONA93529_(XP-410_Series).print_edge_right: 0
print.printer_EPSONA93529_(XP-410_Series).print_edge_top: 0
print.printer_EPSONA93529_(XP-410_Series).print_evenpages: true
print.printer_EPSONA93529_(XP-410_Series).print_footercenter:
print.printer_EPSONA93529_(XP-410_Series).print_footerleft: &PT
print.printer_EPSONA93529_(XP-410_Series).print_footerright: &D
print.printer_EPSONA93529_(XP-410_Series).print_headercenter:
print.printer_EPSONA93529_(XP-410_Series).print_headerleft: &T
print.printer_EPSONA93529_(XP-410_Series).print_headerright: &U
print.printer_EPSONA93529_(XP-410_Series).print_in_color: true
print.printer_EPSONA93529_(XP-410_Series).print_margin_bottom: 0.5
print.printer_EPSONA93529_(XP-410_Series).print_margin_left: 0.5
print.printer_EPSONA93529_(XP-410_Series).print_margin_right: 0.5
print.printer_EPSONA93529_(XP-410_Series).print_margin_top: 0.5
print.printer_EPSONA93529_(XP-410_Series).print_oddpages: true
print.printer_EPSONA93529_(XP-410_Series).print_orientation: 0
print.printer_EPSONA93529_(XP-410_Series).print_page_delay: 50
print.printer_EPSONA93529_(XP-410_Series).print_paper_data: 9
print.printer_EPSONA93529_(XP-410_Series).print_paper_height: 11.00
print.printer_EPSONA93529_(XP-410_Series).print_paper_name:
print.printer_EPSONA93529_(XP-410_Series).print_paper_size_type: 0
print.printer_EPSONA93529_(XP-410_Series).print_paper_size_unit: 1
print.printer_EPSONA93529_(XP-410_Series).print_paper_width: 8.50
print.printer_EPSONA93529_(XP-410_Series).print_plex_name:
print.printer_EPSONA93529_(XP-410_Series).print_resolution: 4784193
print.printer_EPSONA93529_(XP-410_Series).print_resolution_name:
print.printer_EPSONA93529_(XP-410_Series).print_reversed: false
print.printer_EPSONA93529_(XP-410_Series).print_scaling: 1.00
print.printer_EPSONA93529_(XP-410_Series).print_shrink_to_fit: true
print.printer_EPSONA93529_(XP-410_Series).print_to_file: false
print.printer_EPSONA93529_(XP-410_Series).print_unwriteable_margin_bottom: 0
print.printer_EPSONA93529_(XP-410_Series).print_unwriteable_margin_left: 0
print.printer_EPSONA93529_(XP-410_Series).print_unwriteable_margin_right: 0
print.printer_EPSONA93529_(XP-410_Series).print_unwriteable_margin_top: 0
privacy.clearOnShutdown.cookies: false
privacy.clearOnShutdown.sessions: false
privacy.sanitize.migrateFx3Prefs: true
privacy.sanitize.sanitizeOnShutdown: true
storage.vacuum.last.brief.sqlite: 1420558477
storage.vacuum.last.index: 2
storage.vacuum.last.places.sqlite: 1433388921

Important Locked Preferences
----------------------------

JavaScript
----------

Incremental GC: true

Accessibility
-------------

Activated: false
Prevent Accessibility: 0

Library Versions
----------------

NSPR
Expected minimum version: 4.10.8
Version in use: 4.10.8

NSS
Expected minimum version: 3.18.1 Basic ECC
Version in use: 3.18.1 Basic ECC

NSSSMIME
Expected minimum version: 3.18.1 Basic ECC
Version in use: 3.18.1 Basic ECC

NSSSSL
Expected minimum version: 3.18.1 Basic ECC
Version in use: 3.18.1 Basic ECC

NSSUTIL
Expected minimum version: 3.18.1
Version in use: 3.18.1

Experimental Features
---------------------

Comment 12

3 years ago
Still not working with Firefox 39.0

Comment 13

3 years ago
I have the same problem even with v39.0

Here is my about:support
Application Basics
------------------

Name: Firefox
Version: 39.0
Build ID: 20150630154324
Update Channel: release
User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:39.0) Gecko/20100101 Firefox/39.0
Multiprocess Windows: 0/3 (default: false)

Crash Reports for the Last 3 Days
---------------------------------

Report ID: bp-b68a490e-6881-4788-bc36-d14092150716
Submitted: 37 minutes ago

Report ID: bp-980c4528-9bec-4a3e-bf00-3c4be2150714
Submitted: 2 days ago

All Crash Reports

Extensions
----------

Name: Adblock Plus
Version: 2.6.9.1-signed
Enabled: true
ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}

Name: Dangerous Websites Blocker
Version: 4.5.3.8
Enabled: true
ID: content_blocker_6418E0D362104DADA084DC312DFA8ABC@kaspersky.com

Name: Download Panel Tweaker
Version: 0.2.4.1-signed
Enabled: true
ID: downloadPanelTweaker@infocatcher

Name: DownThemAll!
Version: 2.0.18.1-signed
Enabled: true
ID: {DDC359D1-844A-42a7-9AA1-88A850A938A8}

Name: eCleaner
Version: 1.4.1-signed
Enabled: true
ID: {c72c0c73-4eb0-4fb3-af0f-074e97326cfd}

Name: Enhanced Steam
Version: 7.2.2
Enabled: true
ID: jid0-SmvlvxGpvCyG252KbVMqIKR79Uc@jetpack

Name: Firebug
Version: 2.0.11
Enabled: true
ID: firebug@software.joehewitt.com

Name: Flagfox
Version: 5.1.0
Enabled: true
ID: {1018e4d6-728f-4b20-ad56-37578a4de76b}

Name: Greasemonkey
Version: 3.2
Enabled: true
ID: {e4a8a97b-f2ed-450b-b12d-ee082ba24781}

Name: MAFIAAFire Redirector
Version: 0.9d.1-signed
Enabled: true
ID: MafiaaFire@mafiaafire.com

Name: MAFIAAFIRE: Gee! No evil!
Version: 1.0.0.0.1-signed
Enabled: true
ID: CustomGoogle@mafiaafire.com

Name: Pushbullet
Version: 179.1-signed
Enabled: true
ID: jid1-BYcQOfYfmBMd9A@jetpack

Name: RoboForm Toolbar for Firefox
Version: 7.9.14.4
Enabled: true
ID: {22119944-ED35-4ab1-910B-E619EA06A115}

Name: Safe Money
Version: 4.5.3.8
Enabled: true
ID: online_banking_69A4E213815F42BD863D889007201D82@kaspersky.com

Name: SoundCloud Downloader - Technowise
Version: 0.94.1-signed
Enabled: true
ID: {c8d3bc80-0810-4d21-a2c2-be5f2b2832ac}

Name: Speed Dial
Version: 0.9.6.17.1-signed
Enabled: true
ID: {64161300-e22b-11db-8314-0800200c9a66}

Name: Virtual Keyboard
Version: 4.5.3.8
Enabled: true
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user.js Preferences
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Your profile folder contains a user.js file, which includes preferences that were not created by Firefox.

Important Locked Preferences
----------------------------

JavaScript
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Incremental GC: true

Accessibility
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Activated: false
Prevent Accessibility: 0

Library Versions
----------------

NSPR
Expected minimum version: 4.10.8
Version in use: 4.10.8

NSS
Expected minimum version: 3.19.2 Basic ECC
Version in use: 3.19.2 Basic ECC

NSSSMIME
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NSSSSL
Expected minimum version: 3.19.2 Basic ECC
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NSSUTIL
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Experimental Features
---------------------

Comment 14

3 years ago
Updated to Windows 10, problem still existed. Then did a clean reinstall of Windows 10, problem still exists.

Comment 15

3 years ago
Since Google updated the html5 player (look different, sorry can't find where it says what version on the html5 player google is using now) I have not had the audio out of sync after 7 to 10 minutes. Yippee!!!!!

I'm using Firefox 39.0
Anthony, this A/V sync issue is still affecting some people on YouTube HTML5 video. Do you know of any related bugs?
Status: UNCONFIRMED → NEW
Ever confirmed: true
Flags: needinfo?(ajones)

Comment 17

3 years ago
New YouTube HTML5 player mentioned by comment #15 didn't change anything for me. Still out of sync after 7 or 8 minutes and continuously getting more out of sync.

Comment 18

3 years ago
Same here even with new youtube player, currently on Windows 10, Waterfox 39. Same behavior. The only version it worked perfectly in was v37.

Must be some internal issue with DASH (since there's separate streams for video and audio).
Depends on: 1136360
Flags: needinfo?(ajones)

Comment 19

3 years ago
Same issue. about:support at http://cryptb.in/pnULv

Comment 20

3 years ago
Still not working with Firefox 40.0
Is there even still info required or is someone working on this? It's broken for me since 3 months now, which would be fine if I weren't on the release channel plus YouTube not offering any option to go back to using Flash.
Bug 1192679 is a similar A/V sync issue.
Depends on: 1192679
No longer depends on: 1192679
Can you try Beta 41 ?

Comment 23

3 years ago
Just tried Firefox 41 Beta 1, still same problem, still on the 6-7 minute mark happening. Also used a new and clean profile.
status-firefox40: --- → affected
status-firefox41: --- → affected
Summary: Audio becomes out of sync with video on YouTube HTML5 videos. → Audio gradually becomes out of sync with video on YouTube HTML5 videos after 5–8 minutes
cpearce thinks this A/V sync problem might also lead to EME crash bug 1173632.
Blocks: 1173632
Deepil, can you try with 42 or Nightly ?

Comment 26

3 years ago
Firefox 42.0a2: same problem.
Firefox 43.0a1: same problem.
All releases after Firefox 37 are not working and suffer the exact same bug.
Could you do a right click on the playback window and select stats for nerd and copy the output of it?

Thank you

Comment 28

3 years ago
This is from a random video long enough and right after it started to get out of sync, at about the 7min mark.

Video ID:	fRMxZ59TUcI
Dimensions:	1920 x 1080
Resolution:	1920 x 1080@25
Volume:	100%
Stream Host:	r15---sn-4g57kn7d
Stream Type:	https
CPN:	M8KG9E0vog5vu2dc
Mime Type:	video/mp4; codecs="avc1.640028"
DASH:	yes (137/140)
Connection Speed:	68942 Kbps
Dropped Frames:	2/10464
status-firefox42: --- → affected
status-firefox43: --- → affected
Priority: -- → P2

Comment 29

3 years ago
I think it needs to be pointed out that this bug doesn't "wait" until "several minutes in" to happen as some posters here are saying. It happens pretty much immediately. It's just so slight at first that you wont notice it right away unless you're watching footage of something very timing dependent. Something that would fit the bill of timing dependent that makes it obvious pretty much immediately, and what i personally used to test this every time post-37, is footage of a music/rhythm game. Nothing makes it stand out right away better than that.
There were several related A/V sync bugs.  One caused a fixed offset between the audio and video (typically 100ms) which is within the range that some people would notice and others not.  Others caused a gradual drift of A/V sync.  They should all be fixed by the patches in bug 1136360 and we should probably mark this bug as a duplicate of bug 1136360 (although I don't understand the link between this bug and bug 1173632).

Test builds should be available in http://ftp.mozilla.org/pub/mozilla.org/firefox/try-builds/mgregan@mozilla.com-95b50562dd3b/ in a few hours for anyone keen to try them.

Comment 31

3 years ago
Just tried your test build. It's working! Video stayed perfectly sync over at least 15 minutes! Any chance that this will make it to Firefox 41 before release?
(In reply to DeepII from comment #31)
> Just tried your test build. It's working! Video stayed perfectly sync over
> at least 15 minutes! Any chance that this will make it to Firefox 41 before
> release?

Thanks for testing and reporting back!
Status: NEW → RESOLVED
Last Resolved: 3 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1136360
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