Keep in mind that unless you are doing something very creative, it makes little sense to specify both dar and sar, since the last one you mention will basically override the settings set by the previous one. Or avconv -i input.avi -vf sar=1:1 -c:v libxvid -c:a copy output.avi With reencoding: avconv -i input.avi -vf dar=4:3 -c:v libxvid -c:a copy output.avi No reencoding: avconv -i input.avi -aspect 4:3 -c:a copy -c:v copy output.avi That second approach, however, would require the stream to be decoded and reencoded again. It not only allows one to set the display aspect ratio with the -aspect parameter (just like ffmpeg did), but also to manipulate the pixel (aka sample) aspect ratio, which then recalculates the display aspect ratio automatically. If you are not afraid of the command line, i would recommend avconv from libav package. The options available depend on which Mac you are using, and will typically be set. I am not 100% sure, but i would bet that both these are compiled for both Windows and Mac. The aspect ratio and resolution of your Macs display are adjusted using the Display preferences inside Settings. It will be in the settings of your video stream, just set the display resolution to what you want it to be. If you are willing to change it from AVI to MKV (VLC and most other players will have no problem playing it) you can do that with MKV-merge with no problem. AVIdemux can do that when encoding, but i cannot remember if it allows you to do that when you chose to copy the stream without reencoding (you don't want to reencode, since it will not only be time consuming, but also lossy).
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