hello,i need to do transcoding of an mp4 video and i want to keep the i-frame structure the same as in the original video. i've searched info on this but couldn't find out if it is even possible with ffmpeg although my wild guess is that it should be.
furthermore, to complicate things, ffmpeg should be just a simple box in a processing chain and pre-scanning the input is not acceptable. basically, i would like to somehow tell ffmpeg during encoding that for each video frame that it encodes, first check if it was a keyframe in the original video. if yes, make it also in the output, if no, don't do it.
any ideas? thanks! -- jazzman
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