[FFmpeg-devel] [PATCH] MPEG-TS demuxer: Report 4cc in codec_tag field instead of SMTPE RID

Michael Niedermayer michaelni
Tue Sep 1 22:38:56 CEST 2009

On Tue, Sep 01, 2009 at 09:10:57AM +0200, Reimar D?ffinger wrote:
> On Mon, Aug 31, 2009 at 06:02:09PM -0700, Baptiste Coudurier wrote:
> > On 08/31/2009 05:48 PM, M?ns Rullg?rd wrote:
> > > Sorry, but you're wrong.  There is nowhere a requirement that the
> > > format_identifier value correspond one-to-one with anything.
> > 
> > I think the specs are pretty clear:
> > "The registration descriptor of ITU-T Rec. H.222.0 | ISO/IEC 13818-1 is 
> > provided by this text in order to enable users of this Specification to 
> > unambiguously carry data when its format is not recognized by this 
> > Specification. This provision will permit this Specification to carry 
> > all types of data while providing for a method of unambiguous 
> > identification of the characteristics of the underlying private data."
> > 
> > I maintain that using the same registration descriptor for different 
> > private data is against the specifications, since it goes against 
> > providing unambiguous identification of the underlying private data.
> I think M?ns meant to say that "private data" != "codec", and the
> AC3+TrueHD combination mess with other data to differentiate them can
> all together be considered the "private data" format.

> Though I'd say that definitely is a case of going with the letter of the
> spec instead of with the spirit...

i think so as well, though i would word it closer to how baptiste did

But above all, i think its clear that the spec is ambigous as we apparently
interpret it differently from each other.

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The worst form of inequality is to try to make unequal things equal.
-- Aristotle
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