Hi all I am writting program for recording IP cameras videos. I use Aforge framework and can save video in avi format, but it's size is too big. I need some command line program to convert videos from avi to mpeg4 format. Is there any free program and if yes where can I download them and how to use it. Thanks.

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Or you can also use ffmpeg. It's a cross platform for recording, converting videos. You can use it here

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As you don't state what OS you are using I would recommend Handbrake as an excellent free mp4 / h264 encoder. It's cross platform and has options for Windows, Mac and Linux.

It does have a gui but all the actual work appears to be done in a command line program which on my machine appears to be in the install directory as HandBrakeCLI.exe. There is a guide as to how to use the command line version at http://trac.handbrake.fr/wiki/CLIGuide but it appears that it may possibly be slightly out of date (but probably still largely relevant) as there is a note about it on this page.

It is multithreaded and can easily use all the processors you have available.

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