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I have seveal mp4 files which are over 250MB and want to compress them into smaller size hoply, 1/3 of the original size. I installed winff to do so but I dont know what command I should type in. seems like ffmpeg -i filename.mp4 ~~~ my requirements are ; make file size 1/3 or 1/2, trying not to deteriorate the sound quality of them, but the quality of image isnt in much concern.

any help would be appreciated.

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That's probably not possible. MP4 files are compressed without being inside a zip file or similar, so it wouldn't help too much to put them in a compressed file. Do you care about the resolution of said files being lower? –  Yet Another User Jun 16 '13 at 15:24
    
See the two-pass example in the FFmpeg and x264 Encoding Guide. –  LordNeckbeard Jun 17 '13 at 18:35
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