chrome audio corruption issue during transmuxing

[video-dev]

chrome audio corruption issue during transmuxing

[PhilKearney]

+1 I am also experiencing the same issue. Only on Chrome.

[mangui]

your playlist does not reference CODECS :

#EXTM3U
#EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=400000
480x270.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=600000
640x360.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=800000
854x480.m3u8

as a consequence hls.js tries to guess audio codec type by parsing audio metadata.
https://github.com/dailymotion/hls.js/blob/master/src/demux/tsdemuxer.js#L537-L555
if sampling rate is less than 24kHz, it tries to use HE-AAC. (mp4a.40.5)
in your case, sampling rate is 8kHz, but it looks like you were using AAC codec... (mp4a.40.2)
=> wrong guess => Chrome fires an error

as you can see, Chrome is quite pedantic about codec definition...
I tried
if you define CODECS in your main manifest, you should be able to playback your stream.

[mangui]

and as you can see, it does not affect Chrome/Android ... different audio/video pipeline

[mhassman]

Awesome!!
Thank you for the insight.. I'm now explicitly setting codecs and the streams are working in chrome.
Thank you!!!
:-)

[PhilKearney]

Hi there, question. Is there a way to set the codecs in JavaScript code rather than the manifest?

[mangui]

No. Cant you fix your manifest ?

[pkearney13]

Unfortunately I can't, the stream is being provided by a sports stream provider. If I were to ask them to change it what would I ask them to change? thanks.