[MPlayer-users] Re: changing aspect ratio in avi without reencoding

[Arpi]

Hi,

> Milan was recommending to 'abuse' some of AVIs comment tags to store the AR
> there. That way the value could be read before the playback graph is
> rendered and correct width/height be set on output. MPEG container does have
> such a flag and it will be read from MPEG DShow parser before building the
> graph, so it works fine for MPEG on DShow, but not for AVI.

wrong. AR is coded in the video frame headers for mpeg 1/2 too just like in
mpeg 4. so either they workarounded teh shit and they can launch the codec
first, decode header, get width & height (also coded in video frames only,
mpeg container has no a/v headers just random audio/video/sub streams and
some headers controlling the transmission (buffer sizes, bitrate)) & aspect
ratio and then launch teh filters and teh video output, or they
reimplemented part of video codec (the header parser) in the demuxer, just
like i did in mplayer's mpeg demuxer (video.c).


A'rpi / Astral & ESP-team

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