Re: Program to compress AVI files

Roger Heflin wrote:
Paul Smith wrote:
On Mon, Jul 14, 2008 at 7:54 PM, Mark Haney <mhaney@xxxxxxxxxxxxxxxx> wrote:
Is there some program to compress AVI files?
Compress? Video and graphics files tend not to compress well at all. Are we
talking ZIP compression? Or encoding to a smaller file size?

Thanks to both. I am talking about encoding to a smaller file size. Any ideas?

Paul


mencoder would be a good program.

I would suggest first playing it with mplayer and seeing what the current encoding is, if it is already xvid/divx/x264 encoded you won't be able to likely improve things much without lowering the resolution or quality. x264 is supposed to be better than xvid/divx but it is probably not a huge amount, and re-encoding (even on a fast machine) will take anywhere from greater than actual time of the video down to 1/4-1/5 for lower resolution videos. If it is not already one of the good codecs then just reencoding it with the proper settings will be able to reduce it a fair amount.

I do a fair amount of re-encoding of various sorts.

Roger


You can use ffmpeg to find out the video details.

ffmpeg -i {input}

You will get some error messages because you have not specified an output file.

example

movies]$ ffmpeg -i Vista_Beryl.mpg

FFmpeg version UNKNOWN, Copyright (c) 2000-2008 Fabrice Bellard, et al.
configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --incdir=/usr/include/ffmpeg --extra-cflags=-fPIC --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libfaad --enable-libfaac --enable-libgsm --enable-libxvid --enable-libx264 --enable-liba52 --enable-liba52bin --enable-pp --enable-shared --enable-pthreads --enable-gpl --disable-strip
libavutil version: 49.6.0
libavcodec version: 51.50.1
libavformat version: 52.7.0
libavdevice version: 52.0.0
built on Feb 14 2008 17:44:05, gcc: 4.1.2 20070925 (Red Hat 4.1.2-33)
Input #0, mpeg, from 'Vista_Beryl.mpg':
Duration: 00:04:31.9, start: 0.367322, bitrate: 1405 kb/s
Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 720x480 [PAR 8:9 DAR 4:3], 4000 kb/s, 29.97 tb(r)
Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, stereo, 224 kb/s
Must supply at least one output file


--
Robin Laing

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