[MEncoder-users] video errors mpeg copy

[belcampo]

Mike Petersen wrote:
> Hello,
> i'm using mencoder to cut an mpeg movie. Mostly it is working fine with 
> this command :
> mencoder -oac copy -ovc copy -of mpeg -mpegopts format=dvd -ss 10.0 
> -endpos 10.0 source_file -forceidx -o target_file
> 
> But sometimes the picture gets lots of distortions (nearly the whole 
> picture is green). I've found out that this is caused by files with a 
> fps of 50.
Your source is interlaced, so you have to add some deinterlace statement 
to your command. Simple -ovc copy won't work.
> 
> ffmpeg info :
> FFmpeg version SVN-rUNKNOWN, Copyright (c) 2000-2007 Fabrice Bellard, et al.
>   configuration: --enable-gpl --enable-pp --enable-swscaler 
> --enable-pthreads --enable-libvorbis --enable-libtheora --enable-libogg 
> --enable-libgsm --enable-dc1394 --disable-debug --enable-shared 
> --prefix=/usr
>   libavutil version: 1d.49.3.0
>   libavcodec version: 1d.51.38.0
>   libavformat version: 1d.51.10.0
>   built on Mar 12 2008 14:31:53, gcc: 4.2.3 (Ubuntu 4.2.3-2ubuntu4)
> 
> Seems stream 0 codec frame rate differs from container frame rate: 25.00 
> (25/1) -> 50.00 (50/1)
> Input #0, mpeg, from '0805090031.mpg':
>   Duration: 01:18:26.3, start: 0.360000, bitrate: 5975 kb/s
>   Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 720x576, 5700 kb/s, 
> 50.00 fps(r)
>   Stream #0.1[0x80]: Audio: 0x0000, 48000 Hz, stereo, 192 kb/s
> 
> 
> mplayer info :
> MPEG-PS file format detected.
> VIDEO:  MPEG2  720x576  (aspect 2)  25.000 fps  5700.0 kbps (712.5 kbyte/s)
> xscreensaver_disable: Could not find XScreenSaver window.
> ==========================================================================
> Opening video decoder: [mpegpes] MPEG 1/2 Video passthrough
> VDec: vo config request - 720 x 576 (preferred colorspace: Mpeg PES)
> Could not find matching colorspace - retrying with -vf scale...
> Opening video filter: [scale]
> The selected video_out device is incompatible with this codec.
> Try appending the scale filter to your filter list,
> e.g. -vf spp,scale instead of -vf spp.
> VDecoder init failed :(
> Opening video decoder: [libmpeg2] MPEG 1/2 Video decoder libmpeg2-v0.4.0b
> Selected video codec: [mpeg12] vfm: libmpeg2 (MPEG-1 or 2 (libmpeg2))
> ==========================================================================
> ==========================================================================
> Forced audio codec: mad
> Opening audio decoder: [liba52] AC3 decoding with liba52
> Using SSE optimized IMDCT transform
> Using MMX optimized resampler
> AUDIO: 48000 Hz, 2 ch, s16le, 192.0 kbit/12.50% (ratio: 24000->192000)
> Selected audio codec: [a52] afm: liba52 (AC3-liba52)
> ==========================================================================
> AO: [pulse] Failed to connect to server: Connection refused
> AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample)
> Starting playback...
> 
> 
> If i add the options "-noskip -mc 0" the picture is better but there are 
> still some errors every few seconds and it seems that the movie is 
> running to slow.
> 
> I already tried options like ofps and used ffmpeg for cutting but the 
> result seems to be the same, the best i got is the errors every few seconds.
> 
> Does anyone know how i can fix this ?
> 
> Thanks
> 
> Regards
> Mike
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