[MPlayer-dev-eng] fourcc: MP4S

[Alex Beregszaszi]

On Fri, Jan 25, 2002 at 02:59:30PM +0100, Alex Beregszaszi wrote:
> Hi folks!
> 
> I (re)started to work on QT/MP4 today. The demuxer code is working fine, but
> codecs.conf contains some wrong values I think.
> 
> Codecs.conf uses MP4S fourcc, also this is wrong. MP4S means mpeg4
> multiplexed stream, MP4V means mpeg4 video (codec) and MP4A means audio
> (codec).

Hmm, -dumpvideo'd it and it's a mpeg stream (also i don't know much about
mpeg streams, nor these PES,PS,TS,ES types).
Btw, it can't sync, only find 0x1b3 and 0x1b6 packets. Arpi?
I think 0x1b3 is video packet?

> 
> MP4S isn't working yet, becouse 'double-demuxing' isn't supported by mplayer
> now and i think in the (very) near future it will be not supported (Arpi? :)
> 
> Should i change the fourcc's or anyone knows this better than me, and
> therefore i'm wrong..
> 
> Secondly I get only errors with mp4v, with mpeg4ds i can get some crap in the
> of the file, FFmpeg's codecs return bad macroblock errors, the windows codecs
> just gives black-screen, divx4vfw just segfaults in init and divx4 is produces
> some scrap too. (also it's the best i think ;)
> 
> FFmpeg:
> V:   1.4   21   2%  0%  0.0% 0 0 0%
> Error at MB: 102
> Error while decoding frame!
> 
> Demuxer log:
> --------------
> MOV: Track #2:
> MOV:  Track header!
> MOV:  Media stream!
> MOV:   Media header!
> MOV:   Media info!
> MOV: unknown chunk: dinf 28
> MOV:    Sample info!
> MOV:     Sample duration table! (68 blocks)
> MOV:     Description list! (cnt:1)
> MOV:      desc #0: mp4v
> MOV:     Sample size table! (entries=112 ss=0) (ver:0,flags:0)
> MOV:     Sample->Chunk mapping table!  (3 blocks) (ver:0,flags:0)
> MOV:     Chunk offset table! (3 chunks)
> MOV: unknown chunk: ctts 528
> MOV:     Syncing samples (keyframes) table! (9 entries) (ver:0,flags:0)
> MOV:    Video header!
> MOV: unknown chunk: hdlr 29
> MOV:  Edit atom!
> MOV:   Edit list table (0 entries) (ver:0,flags:0)
> MOV track: 3 chunks, 112 samples
> pts=7440  scale=1000  time=7.440
> ==> Found video stream: 2
> palette_count: 16
> Image size: 320 x 240 (36bits)
> Fourcc: mp4v  Codec: ''
> 
> --
> alex
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