[FFmpeg-devel] [PATCH] Ignore bad mapping in AAC (issue 1882)

Cyril Russo stage.nexvision
Fri May 28 08:51:17 CEST 2010

Le 27/05/2010 21:20, Alex Converse a ?crit :
> On Thu, May 27, 2010 at 2:28 PM, Cyril Russo<stage.nexvision at laposte.net>wrote:
>> Hi all,
>>   The attached patch allows aac decoder to continue on a badly mapped AAC
>> file (as shown in issue 1882 and the attached samples) by ignoring the badly
>> tagged channel, instead of refusing to decode.
>> It doesn't fix the mapping of such FAAC generated's stream (a bit too
>> complex for my AAC knowledge).
> I don't have the sample to test this on since roundup is down. However based
> on visual inspection, this seems to return the same underlying channel
> element to two bitstream channel elements
Yes, Alex, you've already answered on the bug tracker. The file contains 
SCE[0] CPE[0] CPE[0] LFE[0]
The patch make libavcodec ignore the first CPE[0], so the file is, at 
least, decoded as 3.1 stream (and not 5.1 like intended, but it's not 

Best regards,

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