1344756 - better audio quality on slowed down html5 video/audio playback speed

Status: RESOLVED INVALID

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

Description

[trondsg+bugzilla+mozilla]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:49.0) Gecko/20100101 Firefox/49.0 SeaMonkey/2.46
Build ID: 20161213175921

Steps to reproduce:

Play a youtube video, and select a lower playback speed (0.5x).


Actual results:

The sound has a very wah-wah-wah quality to it.


Expected results:

Better quality sound (no wah-wah-wah). Imo it should just get a lower pitch, as it preserves the sound quality. However, Chrome manages a quality that's far superior to Firefox, without changing the pitch, so substatial improvement is definetely possible. I still don't think that Chrome's quality is good enough, though.

Comment 1

[JW Wang [:jwwang] [:jw_wang]]

Hi ChunMin,
Please take this bug. This is about the use of libsoundtouch in AudioStream.

Comment 2

[Emma Humphries ☕️🎸🧞‍♀️✨ (she/they) [:emceeaich] (Pacific Time) use needinfo]

This is an assigned P1 bug without activity in two weeks. 

If you intend to continue working on this bug for the current release/iteration/sprint, remove the 'stale-bug' keyword.

Otherwise we'll reset the priority of the bug back to '--' on Monday, August 28th.

Comment 3

[Bulk Bug Changes for mreavy's org]

Mass change P1->P2 to align with new Mozilla triage process

Comment 4

[Ralph Giles (:rillian)]

Unfortunately, Chun-Min isn't available to work on this right now. Ok for anyone to take an work on.

Comment 6

[ldsands]

Forgive me if there are any protocols I'm breaking by posting here but I wanted to know if any work is being done on this bug. I want to know if there are any plans to fix this bug as it has been around for over a year and is an issue for anyone who wants to speed up any video the sound becomes very distorted. See this extension for an example of all of its users dealing with this bug (https://github.com/codebicycle/videospeed). I do not know any other way to escalate this bug. If I were a developer then I would try but I would not know where to begin. Please tell me how to somehow bring this bug to the attention of someone who could solve this issue. Thank you and again sorry if I'm not doing this through the proper method.

Comment 7

[johan.boule]

This should probably be a separate bug, but I would find it really useful to allow the user to select finer grained speed ratios, like  0.95, 0.9 etc. Such tiny slowdowns really help when you're listening to a fast speaker in a foreign language.
The current algorithm might not support such ratios, in which case, there would be no need for another bug.

Also, I would like to mention that VLC (VideoLAN client) is another opensource software which is *excellent* at slowing down audio.

Comment 8

[richardxu100]

I'd also like to express my support for this feature. I can try to help with the algorithm if the code is accessible somewhere.

Comment 9

[ishan.iipm]

This seems to be connected: https://bugzilla.mozilla.org/show_bug.cgi?id=1383363

Comment 10

[Jimsmith]

(In reply to ishan.iipm from comment #9)

This seems to be connected:
https://bugzilla.mozilla.org/show_bug.cgi?id=1383363

(In reply to richardxu100 from comment #8)

I'd also like to express my support for this feature. I can try to help with, the best cactus pots for buy = https://expertplantman.com/best-pots-for-orchids/
the algorithm if the code is accessible somewhere.

How can you help give u example or give us code

Comment 11

[Jimsmith]

(In reply to Bulk Bug Changes for mreavy's org from comment #3)

Mass change P1->P2 to align with new Mozilla triage process The Best lil peep hair styles for men = https://peepmerch.store/lil-peeps-hairstyles

Bulk Bug Changes for mreavy's org · Comment 2. •. 3 years ago. Mass change P1->P2 to align with new Mozilla triage process. Priority: P1 → P2 ...
Please explain some further details

Comment 12

[Jakob Jungmann]

I'd like to be assigned this bug. I do have a possible fix for this.

Comment 13

[Jakob Jungmann]

Attachment: Bug 1344756 - Improve audio quality on slowdown/speedup by inspecting smaller chunks.

Comment 14

[Alastor Wu [:alwu]]

Close bug for a long inactive, also I don't think it's still a case for now.