On Tuesday 15 January 2008, Reinhard Nissl wrote:
> Hi,
>
> Stefan Lucke schrieb:
>
> > is it correct that h264 is written as PES via PlayVideo() ?
> >
> > For decoding with ffmpeg it would be useful to have a
> > PROGRAM_STREAM_MAP in front of a new video stream.
>
> Basically not a bad idea, but where do you put it in live
> streaming?
I think it should be transmitted first, after a stream reset.
A basic PSM that maps from PES 0x01e0 to h264 could
look like:
unsigned char psm_map_0xe0_to_h264 [] =
{ 0x00, 0x00, 0x01, 0xbc,
0x00, 0x10, // psm length
0x00, 0x00, // unknown
0x00, 0x00, // info length
// info data here
0x00, 0x04 // map length
// map data here
0x1b, 0xe0, 0x00, 0x00 // h264 map entry / NO map info
0x00, 0x00, 0x00, 0x00 // crc32
};
That is inspired by ffmpegs: libavformat/mpeg.c
mpegps_psm_parse() line ~220 .
> Or after a seek in VDR's recording player?
By above, it's just (pinned) at the beginning of the file.
Don't know if we should expect changes in between
(but all bad things happen).
>
> Mplayer does some nice tests to determine PES vs. ES. It has just
> not been extended to detect H.264 in the same way.
Aren't users beeing told to feed mplayer with PSM too ?
> H.264 uses a
> limited start code set compared to MPEG1/2 so it should be easy
> to detect the content, due to the distribution of start codes.
>
--
Stefan Lucke
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