Rich Felker wrote:
> On Sat, Jul 15, 2006 at 10:49:02PM +0200, Baptiste
Coudurier wrote:
>> NUT system is the best one around. Still I persist
to say that wraping
>> specs are needed, and even more for ambiguous
codecs wraping formats,
>> and a fourcc for each codec recognized must be
written in the specs,
>> that means standardized.
>
> Let's propose a compromise: additional information on
the NUT website
> or with the spec that's labelled
"informative" as opposed to
> "normative", clarifying what the general
rules mean for particular
> codecs.
I totally agree. It will avoid fourcc collision which might
occur
according to the specs. Even in AVI some codecs use
different fourcc...
Im also thinking about DV, DVCPRO, DV50, DVCPRO100 which
need a clearly
specified fourcc.
> What do you mean by timecodes? I assumed you meant
timestamps but
> maybe something else like chapter info..?
>
> As for subtitles, the subtitle codec_id specifies the
format of the
> data.
Many format supports Timecode track which defines the timing
reference
not starting at 0 and reference GOP headers timecode in
MPEG-2 for
example. They allows non contiguous timing, and some other
features.
IMHO those tracks might need another stream identifier and
some flags
like drop frame flag, negative (reverse playing).
>
>> I just read the specs again and I also do not see
and decent standard to
>> pack extradata for specific codec. Just put the MOV
atoms in NUT ?
>
> Extradata is a single binary data block whose format is
specified by
> the codec. For most codecs its obvious what it should
be. For Xiph
> codecs a 'supplemental codec spec' is needed, as has
been discussed on
> the nut devel list.
For example QDM2 uses 2 atoms. It might be necessary to
mention correct
and clean formating.
Btw all, sorry for all those points I am talking about now,
Im just a
bit late and I really want to participate in NUT revolution
to the
container world.
--
Baptiste COUDURIER GnuPG Key
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