[FFmpeg-devel] [PATCH] MPEG-TS demuxer: Report 4cc in codec_tag field instead of SMTPE RID
Mon Aug 31 18:18:29 CEST 2009
On 8/31/2009 1:27 AM, Reimar D?ffinger wrote:
> On Mon, Aug 31, 2009 at 10:56:18AM +0300, Christian P. Schmidt wrote:
>> I know that mpeg-ts streams to not support 4cc tags for the codecs.
>> However, the mpeg-ts demuxer currently copies the registration ID into
>> the codec's tag field, which in my opinion is worse than leaving the
>> field empty.
>> As an easy workaround the current tables for codec detection could be
>> expanded to hold the 4cc codes as used in riff.c and return those in the
>> codec_tag field.
>> There are two codecs that do not have an official 4cc tag, namely
>> bluray-pcm and E-AC-3. I'd go with mplayer's definitions for those, BPCM
>> and EAC3.
> The codec_tag is not really supposed to be a fourcc, if there is no
> stream-specific tag that (more or less uniquely) indicates the codec used
> in the file it should be 0. Obviously it shouldn't be "random" nonsense
> like it seems to be currently either though.
Huh, it's not "random" nonsense, it's the registration descriptor if
Baptiste COUDURIER GnuPG Key Id: 0x5C1ABAAA
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