Ulf Zibis (12021-08-16): > if I understand correct, mp4 videos are encoded in blocks of 16x16 > pixels. I I'm wondering if I could crop a video by multiples of 16 > pixels without reencoding the remaining blocks.
It depends on the codec, not the format. With a codec like MJPEG, it is possible. There are tools to do it with individual images, look up jpegtran. But with video codecs that use temporal compression, a visible part of the next image can depend on a cropped part of the current image, and that makes it impossible. Regards, -- Nicolas George
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