[mythtv-users] Problems playing MPEG2 from ffmpeg

[Nick Rout]

On Mon, Feb 9, 2009 at 9:19 AM, Tyler T <tylernt at gmail.com> wrote:
> Using a command like this one:
> http://threebit.net/mail-archive/mythtv-users/msg43546.html , I want
> to convert HDTV from a PCHDTV-5500 down to SD so it will play on a Via
> Epia w/ the integrated Unichrome/XvMC MPEG decoder (the 600MHz CPU is
> too slow for anything else).
>
> My Myth frontend is perfectly happy playing back MPEG2 video from a
> Hauppage-PVR150, but barfs on ffmpeg's "-target dvd" output. I have
> successfully converted a 1080i stream to DVD resolution which plays
> great in VLC. In Myth, though, skipping or seeking results in MPEG
> artifacts (like a scratched DVD) and I get lots of these in the log:
>
> [mpegvideo_xvmc_vld @ 0xb72e43c8]current_picture not initialized
> AFD Error: Unknown decoding error
> [mpegvideo_xvmc_vld @ 0xb72e43c8]warning: first frame is no keyframe
> VideoOutputXv Error: Child     A        was already marked as available.
>
> Finally, it dumps me out of playback but no errors are logged except
> the ones above.
>
> I have Googled these error messages with no easy answers. Does anyone
> here know what ffmpeg settings I need to use so that Myth can play the
> resulting file properly?

mythtv relies on an internal database table which contains an index
which is essential for ffwd/rew in a mpeg file. You need to re-index
your file:

http://www.mythtv.org/wiki/Repairing_the_Seektable