[FFmpeg-devel] Latest FFMPEG 0.9 Issues

Baptiste Coudurier baptiste.coudurier at gmail.com
Mon Mar 12 07:35:37 CET 2012

On 12/31/11 8:23 AM, Michael Niedermayer wrote:
> On Fri, Dec 30, 2011 at 09:52:21PM -0800, C Chatterjee wrote:
>> Michael:
>> Thanks for fixing the aacdec.c bug in item 1 below in an email sent by you earlier.
>> On item 2 I believe that checking as below:
>>      else if (enc->codec_id == CODEC_ID_AAC && pkt->size > 2 &&
>>                 (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
>>          av_log(s, AV_LOG_ERROR, "malformated aac bitstream, use -absf aac_adtstoasc\n");
>>          return -1;
>> may not be necessary because the 2 byte header can be at the start of a payload too.
>> I have used this stream on a number of players - VLC, Flash and iPhone. All works. 
>> Is there a case of a player where it does not work.
>> I comment out the lines above in flvenc.c and movenc.c and use ffmpeg as:
>> ffmpeg -y -i xx.flv -acodec copy -vcodec -preset superfast -b:v 150k ff.flv
>> ff.flv works fine on all players I have used.
> hmm, maybe
> baptiste, mike or alex could comment on if this check is or is not
> required ?

The check is there to prevent muxing adts in flv, AFAIK flv requires raw aac.
Copying from flv to flv means copying raw aac to raw aac and should not trigger
that problem unless xx.flv had already been wrongly muxed.

IMHO it is not a good idea to remove that check.

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