[MPlayer-dev-eng] Re: How to play the raw mpeg4 bitstream

[Balatoni Denes]

Hi!

>From the man page:
 -rawvideo <option1:option2:...>
              This option lets you play raw video files.
              Available options are: [...]

bye
Denes


On 2003. július 1. 11.47, swchen wrote:
> > [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> >
> > swchen wrote:
> > >    I have got a stream encoded with ffmpeg, with file name .m4v,
> > > i can sure it is a raw bitstream without any avi header
> > > i can decode it using ffmpeg, but how to play it using Mplayer??
> > >
> > > ./mplayer movie.m4v
> > > ========= sorry, this file format is not recognized/supported ====
> > >
> > > but i can sure it can be understood by libavcodec, how to solve this
> > > problem??
> >
> > It may be understood by libavformat, but AFAIK, libavcodec does encoding
> > and decoding of video and audio at the frame or sample level; it doesn't
> > know about stream formats. MPlayer doesn't use libavformat, since it has
> > its own demuxers.
>
> thank you, i am also sure ffmpeg use libavformat to find the correct codec
> to decode it.
>
> Is is possible for Mplayer to support MPEG4-ES decoding, as i know,
> mpeg4 is the same mpeg1/mpeg2 bitstream, they don't need globe header,
> we can decode mpeg1/2 bitstream start from anywhere in the bitstream, it
> will search next frame start code and start to decode it.
>
> Why Mplayer can play a MPEG2 elementary stream, but can't play a MPEG4
> elementary stream?? If at this time, Mplayer can't decode a MPEG4-ES, we
> can submit patches to it. But i must know is it true first??
>
> >  You should be able to use ffmpeg itself to put the
> > video in the m4v into an AVI. Then, MPlayer can read it.
> >
> > Jonathan Rogers
>
> and if i use ffmpeg to convert the mpeg4-ES into avi, ffmpeg will decode it
> first then encode it again with avi header .
> (command:--> ffmpeg -i movie.m4v movie.avi) of course, this command works
> fine. But it is waste time and video quallity will be degraded!
>
> someone tell me to use
> ---> ffmpeg -i movie.m4v -vcodec copy movie.avi
> but using this command, it can't played correctly using mplayer, even
> ffmpeg itself can't decode the copyed movie.avi correclty.  It's strange!!
> I think the avi header and because chunk length is fixed to 2048.
>
> I have asked this in ffmpeg, but it seems no one answer.
> other command usage ??
>
> swchen