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 pap
>From the author: https://www.surina.net/article/time-and-pitch-
scaling.html
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https://bugs.launchpad.net/bugs/1654480
Title:
HTML5 sound choppy when played at 4x
To manage notificatio
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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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 scre
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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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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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 --af=sca
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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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...
"javascript:%7Bvar%20v%3Ddo
