[MPlayer-users] [BUG] incorrect copy of mpeg video since r22112

[Nico Sabbi]

>Following the report of a user 
>(http://lists.mplayerhq.hu/pipermail/mencoder-users/2007-December/007588.html)
>I have found the following bug:
>if i create a file containing mpeg video copied from an mpeg stream 
>like:
>mencoder -of mpeg -mpegopts format=dvd -ovc copy -o test.mpg 
>dvd://1 -chapter 2 -frames 1000 -oac copy
>or even
>mencoder -ovc copy -o test.avi dvd://1 -chapter 2 -frames 1000 -oac 
>copy
>
>then the first 1/2 frames are corrupted.
>
>The bug was introduced with r22112:
>(demux_mpg_probe() seek to the initial position before returning - 
>patch by reimar)
>
>--- trunk/libmpdemux/demux_mpg.c       2007/02/03 11:32:43     22106
>+++ trunk/libmpdemux/demux_mpg.c       2007/02/03 14:09:47     22112
>@@ -673,6 +673,8 @@
>            mp_msg(MSGT_DEMUXER,MSGL_V,MSGTR_NotSystemStream);
>         }
>   }
>+  //FIXME this shouldn't be necessary
>+  stream_seek(demuxer->stream,tmppos);
>   return file_format;
> }

the patch is correct and what you reported is not reproducible here.
Adding -nosound to your command line will probably keep the
video stream intact, proving that the framedrop is due to mencoder's 
brokennes