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Fix for Opus audio in fragmented MP4 #1219

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Fix for Opus audio in fragmented MP4 #1219

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1dcb9fb
Fix for Opus audio in fragmented MP4
bvibber Nov 3, 2021
765c2e9
Merge branch 'main' into opus
bvibber Nov 3, 2021
849ac9e
Merge branch 'main' into opus
bvibber Nov 15, 2021
7a4844f
Merge branch 'main' into opus
mister-ben Apr 26, 2023
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3 changes: 2 additions & 1 deletion src/media-segment-request.js
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Expand Up @@ -440,7 +440,8 @@ const handleSegmentBytes = ({
// if we have a audio track, with a codec that is not set to
// encrypted audio
if (tracks.audio && tracks.audio.codec && tracks.audio.codec !== 'enca') {
trackInfo.audioCodec = tracks.audio.codec;
// note Opus box name is capitalized, but things want lowercase for checks
trackInfo.audioCodec = tracks.audio.codec.toLowerCase();
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@brandonocasey brandonocasey Apr 20, 2022

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We get this information from mux.js specifically lib/mp4/probe.js and we toLowerCase the codec there if it isn't one that we know. I guess i'm just not understanding how we can get here with a codec that isn't lowercase. Do you have a test source that we can look at?

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@bvibber bvibber Apr 20, 2022

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Sure, here's my test page that combines a few things:
https://brionv.com/misc/hls-test/ogv.html

The Opus audio track: https://brionv.com/misc/hls-test/caminandes-llamigos.webm.audio.opus.mp4

The actual codec fourCC for Opus in MP4 is "Opus" (0x7375704F) -- it is not lowercased in the actual binary file.

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@bvibber bvibber Apr 20, 2022

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I'll pull up the local source and double-check versions of everything when I get a chance -- feel free to shoot any questions on my usage and I'll try my best to answer. :)

I'm not 100% confident I'm correctly labeling everything in the m3u8 for the Opus track version. (iOS accepts the MP3 audio version.)

}

// if we have a video track, with a codec that is not set to
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