1248696 - Audio channel count changes in MSE source buffer throwing decode error

Status: RESOLVED DUPLICATE of bug 1247138

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

Description

[prabubio]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.103 Safari/537.36

Steps to reproduce:

1. Create MediaSource
2. Append SourceBuffer with an mp4 audio track with one channel (channel count = 1). This contains ftyp, moov, moof and mdat headers.
3. Audio plays fine if I add chunks of fragmented mp4 (moof/mdat pairs) with same channel count
4. During playback, append a new chunk of audio mp4 with initialization data (ftype, moov, moof & mdat) in same source buffer but with different audio channel count (e.g., channel count = 2)
5. MSE throws decode error



Actual results:

Firefox throws an error: 
Media resource mediasource:http://test.video.yahoo.com/f52f089b-9fdf-7d4d-bf5d-977f35d6c9a2 could not be decoded.


Expected results:

Audio channel switch should have happened without affecting playback.  This is suggested in w3c standard here https://w3c.github.io/media-source/#byte-stream-formats, in the third point under section "The user agent must support the following:".

Comment 1

[Chris Peterson [:cpeterson]]

prabubio, thanks for reporting this problem? With which version of Firefox do you see the error?

Comment 2

[prabubio]

Hi Chris, 

It is 44.0.2.
Appreciate your help on this!

Comment 3

[Jean-Yves Avenard [:jya]]

(In reply to Chris Peterson [:cpeterson] from comment #1)
> prabubio, thanks for reporting this problem? With which version of Firefox
> do you see the error?

this is by design. We do not have the appropriate backend to support audio configuration change.
Audio changes were disabled in bug 1185827.

Comment 4

[prabubio]

Thanks for the details Jean-Yves! I will look forward for this enhancement.