[Mplayer-dvb] fast transcoding?

[Christoph Gohle]

>>I'm very interested in the feature called "realtime transcoding between 
>>MPEG2 and MPEG4 (partial decompression)" in the mplayer manual since my 
>>
> where?
> it was on TODO for a while, but has been removed afair
> 
i just read it in main/DOCS/documentation.html, rev1.284 in the CVS

>>How similar are the two formats really? Does anyone have a nice 
>>
> not enough :(
> at first look the transcode is possible, for simple, base level mpeg4 files
> or divx files. anyway new divx/mpeg4 uses extras, like quarter-pel motion
> vectors, h263 quantizers, gmc and so on, they were not part of mpeg 1/2
> standard so the dvb probably cannot handle these things.
> the other hard point is the unrestricted mv - the 32 pixels wide invisible
> border over the image used for MC of next frame. it could be emulated (very
> tricky anyway) with dvb but would be visible :(

that dosn't sound very promising (although I don't understand much of 
what you are saying... yet ;-))

> 
> 
>>documentation on the mpeg-fileformats. If I had a nice documentation, I 
>>
> try google, and links at ffmpeg and libmpeg2 sites
> 
Thanks.

Christoph.