This is useful when you need to convert some high resolution MKV video into an AVI file, in order to save space at the cost of quality. Say you have a Matroska video file, my_video.mkv. To convert it to AVI you can use mencoder (the command below is only one line):
mencoder my_video.mkv -ffourcc xvid -ovc lavc -lavcopts vcodec=xvid:vhq:vbitrate=1800 -oac mp3lame -lameopts vbr=5 -o output_video.avi
The resulted AVI file will be output_video.avi, located in the same directory as the source, and will have about 35% the size of the source file.
8 comments:
Don't work for me, it say that I have not the xvid codec and I have it
This does not work, just simply use this:
mencoder test.mkv -ovc lavc -lavcopts vcodec=mpeg4:threads=8:vbitrate=3000 -oac copy -o test.avi
ffmpeg -i test.avi -vcodec copy -vtag xvid -acodec copy final.avi
Avi and mkv are actually container formats. The file size savings come from converting a high quality h264-video-stream (most common video-format in mkv-files) into lower quality divx-streams. Of course, it wouldn't save any space if the original video-bitrate is 1800kbps. To save space you could also convert it into a 1800 kbps-h264-mkv-file.
Gracias a ustedes pude convertir el video, aunque me funcionó la solución de Bob.
http://tambienenlinux.wordpress.com/2010/04/18/convertir-mkv-a-avi/
Bob D.solution worked for me.
I would like to thank Bob D. for the tip.
It worked almost flawlessly for me, I just had to change the mencoder option from "-oac copy" to "-oac pcm" because I got this error message : "Audio format 0x4134504d is incompatible with '-oac copy', please try '-oac pcm' instead or use '-fafmttag' to override it".
I used:
mencoder "Original.mkv" -ffourcc divx -ovc lavc -lavcopts vcodec=mpeg4:vhq:vbitrate=400 -oac mp3lame -lameopts vbr=3 -o "New.avi"
Source with many other conversations.
mencoder Vídeos/127.Hours.2010.SWESUB.AC3.720p.BluRay.x264-NaXii/127.Hours.2010.SWESUB.AC3.720p.BluRay.x264-NaXii.mkv -ffourcc xvid -ovc lavc -lavcopts vcodec=xvid:vhq:vbitrate=1800 -oac mp3lame -lameopts vbr=5 -o output_video.avi
MEncoder SVN-r1.0~rc3+svn20090426-4.4.3 (C) 2000-2009 MPlayer Team
success: format: 0 data: 0x0 - 0x16fc111a
[mkv] Track ID 1: video (V_MPEG4/ISO/AVC), -vid 0
[mkv] Track ID 2: audio (A_DTS), -aid 0, -alang und
[mkv] Track ID 3: subtitles (S_TEXT/UTF8), -sid 0, -slang swe
[mkv] Will play video track 1.
Matroska file format detected.
VIDEO: [avc1] 1280x688 24bpp 23.976 fps 0.0 kbps ( 0.0 kbyte/s)
[V] filefmt:31 fourcc:0x31637661 size:1280x688 fps:23.976 ftime:=0.0417
==========================================================================
Opening audio decoder: [libdca] DTS decoding with libdca
Stream with high frequencies VQ coding
AUDIO: 48000 Hz, 2 ch, s16le, 1536.0 kbit/100.00% (ratio: 192000->192000)
Selected audio codec: [dts] afm: libdca (DTS-libdca)
==========================================================================
Cannot find codec 'xvid' in libavcodec...
Couldn't open video filter 'lavc'.
Failed to open the encoder.
Exiting...
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