[Ffmpeg-devel] Re: integrating AVS decoding into MPlayer

[Baptiste Coudurier]

Hi

Reimar D?ffinger wrote:
> Hello,
> On Fri, Jul 14, 2006 at 09:26:24PM +0100, M?ns Rullg?rd wrote:
>> Mike Melanson <mike at multimedia.cx> writes:
>>> A FourCC is just a number. No big deal.
>> Exactly what I've been saying.  So why should any special weight be
>> given to the particular numbers used in avi files?  To the extent that
>> codecs without an entry in the avi table are unusable, no less.  Madness.
> 
> Well, and my point was why should every program invent its own naming
> scheme with the needed mapping when support for muxing into AVI is
> wanted anyway?
> But (assuming you speak for everyone else as well ;-) ) that seemed to
> be an invalid assumption from my side.
> I'm just trying to find out what the solution would be, and one that is
> at least somewhat consistent.
> For example, what is the codec_tag struct member supposed to be? I
> always assumed it to map to MPlayer's "pseudo FOURCC" or whatever you
> would want to call them, and used it like that in my demuxers.
> And what would be the criteria for entries in this table? If it's not
> "free for all", how to decide which go in and which don't?
> I do understand your objections, but the response seemed to me a bit
> heated since I had the impression that adding things like this was
> a long-standing practice, and nobody objected adding the two audio tags
> to riff.c for NuppelVideo, although I explicitly asked about saying I
> find it a bit ugly.
> 
> Greetings,
> Reimar D?ffinger

IMHO, the current ffmpeg system CODEC_ID should be mapped to mplayer
fourcc/mapping in demux_lavf.c, if a format does not support/contain
fourcc (GXF, MXF, some audio in MOV), it should not set any AVI/whatever
fourcc.

Speaking of that, I personnaly would remove the tag set in GXF demuxer,
and stop spreading MOV files with AVI/whatever fourcc.

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