I wanted to correct the aspect ratio of an mp4 file without re-encoding. Videohelp.com forums had this question answered. In my case, the video was 640x268 pixels, and was supposed to be 4:3.
x * 640 / 268 = 4/3 ; So (1/x) = 640 * 3 / 268 * 4 = 160 / 89, approximately = 16/9
So, my commandline was
mp4box -add inputfile.mp4#1:par=9:16 -add inputfile.mp4#2 output.mp4
One caution - temp file seems to be created in the default Windows temp folder, or perhaps in the same folder as the input file - did not verify which. Overall operation takes as much time as two copy commands - "importing" and "writing" done separately.
x * 640 / 268 = 4/3 ; So (1/x) = 640 * 3 / 268 * 4 = 160 / 89, approximately = 16/9
So, my commandline was
mp4box -add inputfile.mp4#1:par=9:16 -add inputfile.mp4#2 output.mp4
One caution - temp file seems to be created in the default Windows temp folder, or perhaps in the same folder as the input file - did not verify which. Overall operation takes as much time as two copy commands - "importing" and "writing" done separately.
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