1403598 - Picture in YouTube videos freezes while audio goes on - toggling fullscreen resumes video

Status: RESOLVED WORKSFORME

(Core :: Audio/Video: Playback, defect, P2)

Description

[nambulous]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0
Build ID: 20170925150345

Steps to reproduce:

The problem occurred while watching random youtube videos. 


Actual results:

When playing YouTube videos in Firefox 57 Beta 3 x64, the picture can freeze, while only the audio continues playing correctly. Toggling fullscreen on and off, will make the video continue too, but the problem will eventually appear again. 


Expected results:

This problem didn't occur on my PC prior to 57 Beta 3.

Comment 1

[Julien Cristau [:jcristau]]

Chris, Milan, any idea what might cause this?

Comment 2

[Julien Cristau [:jcristau]]

Does the video come back if you scroll while holding ctrl?

Comment 3

[Milan Sreckovic [:milan] (needinfo for best results)]

(In reply to Julien Cristau [:jcristau] from comment #1)
> Chris, Milan, any idea what might cause this?

Attaching to bug 1406439, lets see if it's a part of a larger issue.  Chris would know better, but it's possible this particular one is out of order frames related.

Comment 4

[nambulous]

(In reply to Julien Cristau [:jcristau] from comment #2)
> Does the video come back if you scroll while holding ctrl?

Yes, it does!

Comment 5

[Liz Henry (:lizzard) (relman/hg->git project)]

Too late for a fix for 57, we could still take a patch for 58 though if anyone takes this on.

Comment 6

[Blake Wu [:bwu][:blakewu]]

nambulous,
Can you check if the number of "Dropped Frames" in Youtube status for nerds[1] is increasing when you hit this problem?

[1]Move your cursor on video and press right button to select "Stats for nerds".

Comment 7

[nambulous]

(In reply to Blake Wu [:bwu][:blakewu] from comment #6)
> nambulous,
> Can you check if the number of "Dropped Frames" in Youtube status for
> nerds[1] is increasing when you hit this problem?
> 
> [1]Move your cursor on video and press right button to select "Stats for
> nerds".

When the video stops, the dropped frames stay at 0 at first, but as soon as I get the video moving again, there are a lot of them, yes.

Comment 8

[Blake Wu [:bwu][:blakewu]]

Thanks for your prompt feedback! 
Can you provide the screen capture of stats for nerds and paste the result of your about:support[1]?
I guess decoding speed might not be able to catch up the FPS. 

[1]Enter "about:support" in URL bar.

Comment 9

[nambulous]

(In reply to Blake Wu [:bwu][:blakewu] from comment #8)
> Thanks for your prompt feedback! 
> Can you provide the screen capture of stats for nerds and paste the result
> of your about:support[1]?
> I guess decoding speed might not be able to catch up the FPS. 
> 
> [1]Enter "about:support" in URL bar.

I'll add the stats for nerds the next time it happens, I can't watch YT vids right now until it happens again. 

about:support

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

Name: Firefox
Version: 57.0b8
Build ID: 20171013042429
Update Channel: beta
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0
OS: Windows_NT 10.0
Multiprocess Windows: 1/1 (Enabled by user)
Web Content Processes: 8/7
Stylo: true (enabled by default)
Google Key: Found
Mozilla Location Service Key: Found
Safe Mode: false

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

All Crash Reports

Firefox Features
----------------

Name: Activity Stream
Version: 2017.10.05.1066-43726d35
ID: [e-mail]

Name: Application Update Service Helper
Version: 2.0
ID: [e-mail]

Name: Firefox Screenshots
Version: 19.2.0
ID: [e-mail]

Name: Follow-on Search Telemetry
Version: 0.9.5
ID: [e-mail]

Name: Form Autofill
Version: 1.0
ID: [e-mail]

Name: Multi-process staged rollout
Version: 3.05
ID: [e-mail]

Name: Photon onboarding
Version: 0.1
ID: [e-mail]

Name: Pocket
Version: 1.0.5
ID: [e-mail]

Name: Shield Recipe Client
Version: 76
ID: [e-mail]

Name: Web Compat
Version: 1.1
ID: [e-mail]

Extensions
----------

Name: ADB Helper
Version: 0.11.2
Enabled: true
ID: [e-mail]

Name: Ghostery
Version: 7.3.3.7
Enabled: true
ID: [e-mail]

Name: Smart Referer
Version: 0.2.3
Enabled: true
ID: [e-mail]

Name: uBlock Origin
Version: 1.14.15b1
Enabled: true
ID: [e-mail]

Name: Valence
Version: 0.3.8
Enabled: true
ID: [e-mail]

Name: ScrapBook Plus
Version: 1.10.25.42
Enabled: false
ID: [e-mail]

Graphics
--------

Features
Compositing: Direct3D 11 (Advanced Layers)
Asynchronous Pan/Zoom: wheel input enabled; scrollbar drag enabled; keyboard enabled; autoscroll enabled
WebGL 1 Driver WSI Info: EGL_VENDOR: Google Inc. (adapter LUID: 00000000000083ea) EGL_VERSION: 1.4 (ANGLE 2.1.0.dec065540d5f) EGL_EXTENSIONS: EGL_EXT_create_context_robustness EGL_ANGLE_d3d_share_handle_client_buffer EGL_ANGLE_d3d_texture_client_buffer EGL_ANGLE_surface_d3d_texture_2d_share_handle EGL_ANGLE_query_surface_pointer EGL_ANGLE_window_fixed_size EGL_ANGLE_keyed_mutex EGL_ANGLE_surface_orientation EGL_ANGLE_direct_composition EGL_NV_post_sub_buffer EGL_KHR_create_context EGL_EXT_device_query EGL_KHR_image EGL_KHR_image_base EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_gl_renderbuffer_image EGL_KHR_get_all_proc_addresses EGL_KHR_stream EGL_KHR_stream_consumer_gltexture EGL_NV_stream_consumer_gltexture_yuv EGL_ANGLE_flexible_surface_compatibility EGL_ANGLE_stream_producer_d3d_texture_nv12 EGL_ANGLE_create_context_webgl_compatibility EGL_CHROMIUM_create_context_bind_generates_resource EGL_EXTENSIONS(nullptr): EGL_EXT_client_extensions EGL_EXT_platform_base EGL_EXT_platform_device EGL_ANGLE_platform_angle EGL_ANGLE_platform_angle_d3d EGL_ANGLE_device_creation EGL_ANGLE_device_creation_d3d11 EGL_ANGLE_experimental_present_path EGL_KHR_client_get_all_proc_addresses
WebGL 1 Driver Renderer: Google Inc. -- ANGLE (Radeon RX 580 Series Direct3D11 vs_5_0 ps_5_0)
WebGL 1 Driver Version: OpenGL ES 2.0 (ANGLE 2.1.0.dec065540d5f)
WebGL 1 Driver Extensions: GL_ANGLE_depth_texture GL_ANGLE_framebuffer_blit GL_ANGLE_framebuffer_multisample GL_ANGLE_instanced_arrays GL_ANGLE_lossy_etc_decode GL_ANGLE_pack_reverse_row_order GL_ANGLE_request_extension GL_ANGLE_robust_client_memory GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_ANGLE_texture_usage GL_ANGLE_translated_shader_source GL_CHROMIUM_bind_generates_resource GL_CHROMIUM_bind_uniform_location GL_CHROMIUM_copy_compressed_texture GL_CHROMIUM_copy_texture GL_CHROMIUM_sync_query GL_EXT_blend_minmax GL_EXT_color_buffer_half_float GL_EXT_debug_marker GL_EXT_discard_framebuffer GL_EXT_disjoint_timer_query GL_EXT_draw_buffers GL_EXT_frag_depth GL_EXT_map_buffer_range GL_EXT_occlusion_query_boolean GL_EXT_read_format_bgra GL_EXT_robustness GL_EXT_sRGB GL_EXT_shader_texture_lod GL_EXT_texture_compression_dxt1 GL_EXT_texture_filter_anisotropic GL_EXT_texture_format_BGRA8888 GL_EXT_texture_rg GL_EXT_texture_storage GL_EXT_unpack_subimage GL_KHR_debug GL_NV_EGL_stream_consumer_external GL_NV_fence GL_NV_pack_subimage GL_NV_pixel_buffer_object GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth32 GL_OES_element_index_uint GL_OES_get_program_binary GL_OES_mapbuffer GL_OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_texture_float GL_OES_texture_float_linear GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_vertex_array_object
WebGL 1 Extensions: ANGLE_instanced_arrays EXT_blend_minmax EXT_color_buffer_half_float EXT_frag_depth EXT_shader_texture_lod EXT_texture_filter_anisotropic EXT_disjoint_timer_query OES_element_index_uint OES_standard_derivatives OES_texture_float OES_texture_float_linear OES_texture_half_float OES_texture_half_float_linear OES_vertex_array_object WEBGL_color_buffer_float WEBGL_compressed_texture_s3tc WEBGL_debug_renderer_info WEBGL_debug_shaders WEBGL_depth_texture WEBGL_draw_buffers WEBGL_lose_context MOZ_WEBGL_lose_context MOZ_WEBGL_compressed_texture_s3tc MOZ_WEBGL_depth_texture
WebGL 2 Driver WSI Info: EGL_VENDOR: Google Inc. (adapter LUID: 00000000000083ea) EGL_VERSION: 1.4 (ANGLE 2.1.0.dec065540d5f) EGL_EXTENSIONS: EGL_EXT_create_context_robustness EGL_ANGLE_d3d_share_handle_client_buffer EGL_ANGLE_d3d_texture_client_buffer EGL_ANGLE_surface_d3d_texture_2d_share_handle EGL_ANGLE_query_surface_pointer EGL_ANGLE_window_fixed_size EGL_ANGLE_keyed_mutex EGL_ANGLE_surface_orientation EGL_ANGLE_direct_composition EGL_NV_post_sub_buffer EGL_KHR_create_context EGL_EXT_device_query EGL_KHR_image EGL_KHR_image_base EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_gl_renderbuffer_image EGL_KHR_get_all_proc_addresses EGL_KHR_stream EGL_KHR_stream_consumer_gltexture EGL_NV_stream_consumer_gltexture_yuv EGL_ANGLE_flexible_surface_compatibility EGL_ANGLE_stream_producer_d3d_texture_nv12 EGL_ANGLE_create_context_webgl_compatibility EGL_CHROMIUM_create_context_bind_generates_resource EGL_EXTENSIONS(nullptr): EGL_EXT_client_extensions EGL_EXT_platform_base EGL_EXT_platform_device EGL_ANGLE_platform_angle EGL_ANGLE_platform_angle_d3d EGL_ANGLE_device_creation EGL_ANGLE_device_creation_d3d11 EGL_ANGLE_experimental_present_path EGL_KHR_client_get_all_proc_addresses
WebGL 2 Driver Renderer: Google Inc. -- ANGLE (Radeon RX 580 Series Direct3D11 vs_5_0 ps_5_0)
WebGL 2 Driver Version: OpenGL ES 3.0 (ANGLE 2.1.0.dec065540d5f)
WebGL 2 Driver Extensions: GL_ANGLE_depth_texture GL_ANGLE_framebuffer_blit GL_ANGLE_framebuffer_multisample GL_ANGLE_instanced_arrays GL_ANGLE_lossy_etc_decode GL_ANGLE_pack_reverse_row_order GL_ANGLE_request_extension GL_ANGLE_robust_client_memory GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_ANGLE_texture_usage GL_ANGLE_translated_shader_source GL_CHROMIUM_bind_generates_resource GL_CHROMIUM_bind_uniform_location GL_CHROMIUM_copy_compressed_texture GL_CHROMIUM_copy_texture GL_CHROMIUM_sync_query GL_EXT_blend_minmax GL_EXT_color_buffer_float GL_EXT_color_buffer_half_float GL_EXT_debug_marker GL_EXT_discard_framebuffer GL_EXT_disjoint_timer_query GL_EXT_draw_buffers GL_EXT_frag_depth GL_EXT_map_buffer_range GL_EXT_occlusion_query_boolean GL_EXT_read_format_bgra GL_EXT_robustness GL_EXT_sRGB GL_EXT_shader_texture_lod GL_EXT_texture_compression_dxt1 GL_EXT_texture_filter_anisotropic GL_EXT_texture_format_BGRA8888 GL_EXT_texture_norm16 GL_EXT_texture_rg GL_EXT_texture_storage GL_EXT_unpack_subimage GL_KHR_debug GL_NV_EGL_stream_consumer_external GL_NV_fence GL_NV_pack_subimage GL_NV_pixel_buffer_object GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_EGL_image_external_essl3 GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth32 GL_OES_element_index_uint GL_OES_get_program_binary GL_OES_mapbuffer GL_OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_texture_float GL_OES_texture_float_linear GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_vertex_array_object
WebGL 2 Extensions: EXT_color_buffer_float EXT_texture_filter_anisotropic EXT_disjoint_timer_query OES_texture_float_linear WEBGL_compressed_texture_s3tc WEBGL_debug_renderer_info WEBGL_debug_shaders WEBGL_lose_context MOZ_WEBGL_lose_context MOZ_WEBGL_compressed_texture_s3tc
Direct2D: true
DirectWrite: true (10.0.15063.674)
GPU #1
Active: Yes
Description: Radeon RX 580 Series
Vendor ID: 0x1002
Device ID: 0x67df
Driver Version: 22.19.685.0
Driver Date: 10-5-2017
Drivers: aticfx64 aticfx64 aticfx64 amdxc64 aticfx32 aticfx32 aticfx32 amdxc32 atiumd64 atidxx64 atidxx64 atiumdag atidxx32 atidxx32 atiumdva atiumd6a atitmm64
Subsys ID: 00000000
RAM: 8192

Diagnostics
ClearType Parameters: Gamma: 2.2 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 50
AzureCanvasAccelerated: 0
AzureCanvasBackend: Direct2D 1.1
AzureCanvasBackend (UI Process): skia
AzureContentBackend: Direct2D 1.1
AzureContentBackend (UI Process): skia
AzureFallbackCanvasBackend (UI Process): cairo
GPUProcessPid: 1300
ClearType Parameters: Gamma: 2.2 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 50
Decision Log
WEBRENDER:
opt-in by default: WebRender is an opt-in feature
unavailable by runtime: Build doesn't include WebRender




Media
-----

Audio Backend: wasapi
Max Channels: 8
Preferred Channel Layout: 3f4 lfe
Preferred Sample Rate: 48000
Output Devices
Name: Group
2 - Digital Display Audio (AMD High Definition Audio Device): HDAUDIO\FUNC_01&VEN_1002&DEV_AA01&SUBSYS_00AA0100&REV_1007\5&be16f15&1&0001
Realtek Digital Output (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0900&SUBSYS_104386AE&REV_1000\4&2de74382&0&0001
5 - Digital Display Audio (AMD High Definition Audio Device): HDAUDIO\FUNC_01&VEN_1002&DEV_AA01&SUBSYS_00AA0100&REV_1007\5&be16f15&1&0001
Speakers (Logitech USB Headset): USB\VID_046D&PID_0A44&MI_00\7&3a2342e0&0&0000
Speakers (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0900&SUBSYS_104386AE&REV_1000\4&2de74382&0&0001
1 - Digital Display Audio (AMD High Definition Audio Device): HDAUDIO\FUNC_01&VEN_1002&DEV_AA01&SUBSYS_00AA0100&REV_1007\5&be16f15&1&0001
4 - Digital Display Audio (AMD High Definition Audio Device): HDAUDIO\FUNC_01&VEN_1002&DEV_AA01&SUBSYS_00AA0100&REV_1007\5&be16f15&1&0001
3 - Digital Display Audio (AMD High Definition Audio Device): HDAUDIO\FUNC_01&VEN_1002&DEV_AA01&SUBSYS_00AA0100&REV_1007\5&be16f15&1&0001
6 - Digital Display Audio (AMD High Definition Audio Device): HDAUDIO\FUNC_01&VEN_1002&DEV_AA01&SUBSYS_00AA0100&REV_1007\5&be16f15&1&0001
Input Devices
Name: Group
Internal AUX Jack (AMD High Definition Audio Device): HDAUDIO\FUNC_01&VEN_1002&DEV_AA01&SUBSYS_00AA0100&REV_1007\5&be16f15&1&0001
Line In (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0900&SUBSYS_104386AE&REV_1000\4&2de74382&0&0001
Rear Blue In (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0900&SUBSYS_104386AE&REV_1000\4&2de74382&0&0001
Internal AUX Jack (AMD High Definition Audio Device): HDAUDIO\FUNC_01&VEN_1002&DEV_AA01&SUBSYS_00AA0100&REV_1007\5&be16f15&1&0001
Internal AUX Jack (AMD High Definition Audio Device): HDAUDIO\FUNC_01&VEN_1002&DEV_AA01&SUBSYS_00AA0100&REV_1007\5&be16f15&1&0001
Microphone (Logitech USB Headset): USB\VID_046D&PID_0A44&MI_00\7&3a2342e0&0&0000
Subwoofer (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0900&SUBSYS_104386AE&REV_1000\4&2de74382&0&0001
Stereo Mix (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0900&SUBSYS_104386AE&REV_1000\4&2de74382&0&0001
Internal AUX Jack (AMD High Definition Audio Device): HDAUDIO\FUNC_01&VEN_1002&DEV_AA01&SUBSYS_00AA0100&REV_1007\5&be16f15&1&0001
Internal AUX Jack (AMD High Definition Audio Device): HDAUDIO\FUNC_01&VEN_1002&DEV_AA01&SUBSYS_00AA0100&REV_1007\5&be16f15&1&0001
Microphone (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0900&SUBSYS_104386AE&REV_1000\4&2de74382&0&0001
Front (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0900&SUBSYS_104386AE&REV_1000\4&2de74382&0&0001
Internal AUX Jack (AMD High Definition Audio Device): HDAUDIO\FUNC_01&VEN_1002&DEV_AA01&SUBSYS_00AA0100&REV_1007\5&be16f15&1&0001
Front Pink In (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0900&SUBSYS_104386AE&REV_1000\4&2de74382&0&0001
Rear (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0900&SUBSYS_104386AE&REV_1000\4&2de74382&0&0001
Microphone (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0900&SUBSYS_104386AE&REV_1000\4&2de74382&0&0001
Center (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0900&SUBSYS_104386AE&REV_1000\4&2de74382&0&0001
Side (Realtek High Definition Audio): HDAUDIO\FUNC_01&VEN_10EC&DEV_0900&SUBSYS_104386AE&REV_1000\4&2de74382&0&0001

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

accessibility.typeaheadfind.flashBar: 0
browser.cache.disk.capacity: 358400
browser.cache.disk.filesystem_reported: 1
browser.cache.disk.hashstats_reported: 1
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.cache.frecency_experiment: 2
browser.download.useDownloadDir: false
browser.places.smartBookmarksVersion: 8
browser.search.useDBForOrder: true
browser.sessionstore.upgradeBackup.latestBuildID: 20171013042429
browser.startup.homepage: about:blank
browser.startup.homepage_override.buildID: 20171013042429
browser.startup.homepage_override.mstone: 57.0
browser.tabs.remote.force-enable: true
browser.tabs.warnOnClose: false
browser.urlbar.maxRichResults: 7
browser.urlbar.searchSuggestionsChoice: false
browser.urlbar.suggest.searches: false
browser.urlbar.trimURLs: false
browser.urlbar.userMadeSearchSuggestionsChoice: true
dom.apps.lastUpdate.buildID: 20160916101415
dom.apps.lastUpdate.mstone: 49.0
dom.apps.reset-permissions: true
dom.ipc.processCount: 7
dom.mozApps.used: true
dom.push.userAgentID: ab29ba9166ff413492e5d3b0f00d1b95
extensions.lastAppVersion: 57.0
font.internaluseonly.changed: false
general.autoScroll: false
gfx.crash-guard.d3d11layers.appVersion: 53.0
gfx.crash-guard.d3d11layers.deviceID: 0x6939
gfx.crash-guard.d3d11layers.driverVersion: 22.19.156.1
gfx.crash-guard.d3d11layers.feature-d2d: true
gfx.crash-guard.d3d11layers.feature-d3d11: true
gfx.crash-guard.status.: 2
gfx.crash-guard.status.d3d11layers: 2
gfx.crash-guard.status.d3d11video: 2
gfx.crash-guard.status.d3d9video: 2
layers.mlgpu.sanity-test-failed: false
media.benchmark.vp9.fps: 207
media.benchmark.vp9.versioncheck: 2
media.gmp-eme-adobe.abi: x86_64-msvc-x64
media.gmp-eme-adobe.enabled: false
media.gmp-eme-adobe.lastUpdate: 1465950796
media.gmp-eme-adobe.version: 17
media.gmp-gmpopenh264.abi: x86_64-msvc-x64
media.gmp-gmpopenh264.enabled: false
media.gmp-gmpopenh264.lastUpdate: 1471284296
media.gmp-gmpopenh264.version: 1.6
media.gmp-manager.buildID: 20171013042429
media.gmp-manager.lastCheck: 1508198777
media.gmp-widevinecdm.abi: x86_64-msvc-x64
media.gmp-widevinecdm.enabled: false
media.gmp-widevinecdm.lastUpdate: 1506277518
media.gmp-widevinecdm.version: 1.4.8.1008
media.gmp.storage.version.observed: 1
media.hardware-video-decoding.failed: false
media.peerconnection.enabled: false
media.peerconnection.ice.default_address_only: true
media.peerconnection.ice.no_host: true
network.cookie.cookieBehavior: 3
network.cookie.lifetimePolicy: 2
network.cookie.prefsMigrated: true
network.dns.disablePrefetch: true
network.http.speculative-parallel-limit: 0
network.predictor.cleaned-up: true
network.predictor.enabled: false
network.prefetch-next: false
places.database.lastMaintenance: 1508081230
places.history.expiration.transient_current_max_pages: 141700
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
plugins.ctprollout.cohort: test
plugins.ctprollout.cohortSample: 0.632623
privacy.donottrackheader.enabled: true
privacy.history.custom: true
security.sandbox.content.tempDirSuffix: {034cb4bb-f73e-4121-8979-ae08f5adfa62}
security.ssl.errorReporting.automatic: true
services.sync.declinedEngines: passwords
services.sync.engine.bookmarks.validation.lastTime: 1507295862
services.sync.engine.passwords: false
services.sync.engine.prefs.modified: false
services.sync.lastPing: 1508198641
services.sync.lastSync: Tue Oct 17 2017 16:25:52 GMT+0200 (W. Europe Standard Time)
services.sync.numClients: 4
storage.vacuum.last.index: 1
storage.vacuum.last.places.sqlite: 1505848552
ui.osk.debug.keyboardDisplayReason: IKPOS: Touch screen not found.
ui.osk.enabled: false

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

Places Database
---------------

JavaScript
----------

Incremental GC: true

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

Activated: false
Prevent Accessibility: 0
Accessible Handler Used: true
Accessibility Instantiator:

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

NSPR
Expected minimum version: 4.17
Version in use: 4.17

NSS
Expected minimum version: 3.33
Version in use: 3.33

NSSSMIME
Expected minimum version: 3.33
Version in use: 3.33

NSSSSL
Expected minimum version: 3.33
Version in use: 3.33

NSSUTIL
Expected minimum version: 3.33
Version in use: 3.33

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

Name: Intersection Observer API
ID: [e-mail]
Description: Measures the impact of enabling the Intersection Observer API in Firefox Beta 54
Active: false
End Date: 1496621959950
Homepage:
Branch: control

Sandbox
-------

Content Process Sandbox Level: 3
Effective Content Process Sandbox Level: 3

Comment 10

[nambulous]

Okay, here's a screenshot of the stats for nerds: https://i.imgur.com/JrjpZw5.jpg

Hope it helps!

Comment 11

[Milan Sreckovic [:milan] (needinfo for best results)]

Possibly related to bug 1408781?

Comment 12

[Jean-Yves Avenard [:jya]]

(In reply to Blake Wu [:bwu][:blakewu] from comment #8)
> Thanks for your prompt feedback! 
> Can you provide the screen capture of stats for nerds and paste the result
> of your about:support[1]?
> I guess decoding speed might not be able to catch up the FPS. 
> 

Doubtful, the OP has an extremely powerful machines. 208fps benchmark, is one of the highest score I've ever seen.
> [1]Enter "about:support" in URL bar.

Comment 13

[Blake Wu [:bwu][:blakewu]]

I think we really need to know where those dropped frames come from. That would be easier for us to quickly narrow down the problem. 

Kilik, 
This is a good example that we need a better efficient way to analyze this kind of bugs and narrow down the problem quickly.

Comment 14

[Kilik Kuo [:kikuo] (inactive)]

I'd figure out the relation between the number of image selected in ImageHost.cpp (for render) and the number of dropped frame counted in ImageContainer.cpp.
It might be worth including these information in VideoPlaybackQuality.

Comment 15

[nambulous]

At some point during the Firefox 58 Beta process it started working again for me, so I changed the status to "RESOLVED WORKSFORME".