Firefox is an essential project. I am so god damn happy that this has
been fixed. omg. a basic feature built into youtube/audible, any major
media distributor has built in speed controls expecting functional
browser implementation. especially in the era of chromium based browser
monopoly this is
Clearly something that we can do yes. I'm going to think about it today.
Thanks for your kind message!
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https://bugs.launchpad.net/bugs/1654480
Title:
HTML5 sound
Added to the Beta73 relnotes, thanks for flagging this.
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Title:
HTML5 sound choppy when played at 4x
Status in Mozilla Firefox:
Not sure whether this is considered inappropriate here, however I just
wanted to say thank you tackling this issue.
The latest Firefox nightly sounds nearly identical to Chrome for me now.
So this is a huge improvement! I'm not sure whether this would be worth
the effort, however I might see use
Release Note Request (optional, but appreciated)
[Why is this notable]: Vastly improved audio quality when changing the audio
playback rate during media playback. This was requested for years, and brings
Firefox closer perceptually to other browsers
[Affects Firefox for Android]: yes
[Suggested
** Changed in: firefox
Status: Confirmed => Fix Released
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Title:
HTML5 sound choppy when played at 4x
Status in Mozilla
Thanks. The patch is a significant improvement!
At 4x with 10ms window, it's easy to comprehend speech. There is some
slightly noticeable choppiness in some videos. I'm not an audio expert,
but I tried to do some analysis using Audacity + Gimp. I plotted both
track as Mel Spectrograms, took a
>From the author: https://www.surina.net/article/time-and-pitch-
scaling.html
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Title:
HTML5 sound choppy when played at 4x
I started digging into the SoundTouch library and confirmed my
suspicion. https://hg.mozilla.org/mozilla-
central/file/tip/media/libsoundtouch/src/TDStretch.cpp#l637
Author says it's implemented using "WSOLA-like method". Waveform-
similarity-based synchronized overlap-add. Maybe based on this
Created attachment 9114054
2019-12-05_21-09-44 3x identical to 1x.png
In this screenshot, the first track is Chrome, 2nd track is Firefox at
3x, and 3rd track is Firefox at 1x.
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Created attachment 9114055
2019-12-05_21-14-30 missing samples.png
Top is 3x. Bottom is 1x. Estimate of the amount of audio data that is
skipped before waveforms align.
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I used MOZ_DUMP_AUDIO=1 to capture samples from 1x vs 3x. The waveforms
at 3x are identical to 1x for about 45ms. Then it skips and copies
another 45ms.
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Created attachment 9115722
sequence-size-comparisons.zip
(In reply to alex.korchemniy from comment #23)
> The waveforms at 3x are identical to 1x for about 45ms. Then it skips and
> copies another 45ms.
This is because the default sequence size at 2x speed is 40ms with some
variation due to
Pushed by pade...@mozilla.com:
https://hg.mozilla.org/integration/autoland/rev/f21621632fac
Improve libsoundtouch high playback rate speech clarity with pitch preservation
by using a smaller time stretcher sequence size r=padenot
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Created attachment 9115728
Bug 1427267 - Improve libsoundtouch high playback rate speech clarity with
pitch preservation by using a smaller time stretcher sequence size
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With the SoundTouch algorithm there isn't much improvement with a window
size below 10ms. I found a quicker way to test various parameters using
mpv, which uses same/similar algo. When I get some time I'll generate
random samples with various parameters and do a blind perceptual test.
mpv
https://hg.mozilla.org/mozilla-central/rev/f21621632fac
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Title:
HTML5 sound choppy when played at 4x
Status in Mozilla Firefox:
I also just want to clarify: I notice this at 1.5 and 1.75 and 2x speeds
as well, it's just more subtle - definitely still there though. Since
the title here is talking about the issue at higher speeds, just want to
make sure that it's not ignored for speeds <2x.
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It would be 1383363, and it's not too hard for someone that knows how to
write DSP code, but needs to be prioritized.
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Title:
(In reply to Bryce Seager van Dyk (:bryce) from comment #7)
> I've been unable to repro this on OSX and a couple of other systems I've
> tested.
>
> Isaac, are you still seeing issue? If so, could you please gather a log
> using MOZ_LOG=MediaFormatReader:5?
What are the prospects of this bug
Paul, do you have any thoughts on the difficulty of a fix here and if
there are any related audio bugs we should be aware of/link to this bug?
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I believe this is due to Firefox playing ~70ms samples of audio at
original speed, and skipping between them. In my experience with a
similar effect in mplayer (https://mplayerhq.hu/), blending samples of
about 15ms produces quality comparable to Webkit (Chrome, Opera).
To test this yourself in
Launchpad has imported 18 comments from the remote bug at
https://bugzilla.mozilla.org/show_bug.cgi?id=1427267.
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will be sent to the remote bug automatically. Read more about
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** Also affects: firefox via
https://bugzilla.mozilla.org/show_bug.cgi?id=1427267
Importance: Unknown
Status: Unknown
** Changed in: firefox (Ubuntu)
Status: Incomplete => New
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This bug should have been opened with Firefox instead. I found the
ticket: https://bugzilla.mozilla.org/show_bug.cgi?id=1427267
** Bug watch added: Mozilla Bugzilla #1427267
https://bugzilla.mozilla.org/show_bug.cgi?id=1427267
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Thank you for taking the time to report this bug and helping to make
Ubuntu better. We are sorry that we do not always have the capacity to
look at all reported bugs in a timely manner. There have been many
changes in Ubuntu since that time you reported the bug and your problem
may have been fixed
Public bug reported:
I use a bookmarklet to set the playback rate on the HTML5 player element
to 4x (tested with YouTube). Chrome handles the audio flawlessly, but
Firefox becomes choppy after 2x.
Here's the bookmarklet. The following line may get mangled or removed...
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