[MPlayer-users] Garbled/distorted video with MPEG-2 transport stream playback (DVB)

[Aaron Williams]

I saw this same behavior when I was experimenting with clipping when 
transcoding MPEG streams from my ReplayTV to MPEG4 (using the latest CVS 
transcode).  This happened when clipping the 720x480 original when the 
horizontal clipping values were around 28 but went away with 32.  I got 
a lot of warnings with 28, presumably since the resulting image wasn't a 
multiple of the macroblock size or something.  I saw the same weird 
color bars and shifted color patterns during playback.

-Aaron

Falck Kenneth wrote:
> Hi,
>
> I use mplayer together with Freevo to record and playback DVB MPEG-2
> transport streams. It works very well for this purpose, as the transport
> stream is recorded with -dumpstream -dumpfile and can then be played
> back.
>
> My problem is that sometimes, certain programmes on certain channels
> cannot be played back. The video image is distorted, as if the
> vertical/horizontal sync had been somehow lost. The picture looks the
> same as an old CRT monitor with invalid frequencies, but this happens
> "within" mplayer, inside the video window. (My screens are TFT anyway)
>
> To be more specific, it happens at least with "Dr. Phil" on channel 4
> here in Finland. The beginning commercials play fine, but when the
> actual programme starts, the picture becomes distorted. At the same
> time, mplayer prints out this, apparently detecting some change in the
> MPEG2 encoding parameters:
>
> VDec: vo config request - 704 x 576 (preferred csp: Planar YV12)
> VDec: using Planar YV12 as output csp (no 0)
> Movie-Aspect is 1.33:1 - prescaling to correct movie aspect.
> VO: [directx] 704x576 => 768x576 Planar YV12
>
> The problem is present in 1.0pre7 and CVS-20050725, and happens on both
> Linux and Windows, in both full-screen and windowed mode. It is not
> related to freevo, as it happens also when playing back video manually
> from command line.
>
> Does anybody have suggestions what to do to fix it?
>
>