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I want to record a mjpeg stream via ffmpeg, but as the framerate of the mjpeg is very unreliable the result video is at first to fast and the speed changes.

The source i used to test is: http://c-cam.uchicago.edu/mjpg/video.mjpg

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Have you tried the "-sameq" option from this question or the "-re" option from this other question? I've no idea if they work, but worth a shot... – Mokubai Oct 17 '11 at 19:26

Try to adjust the bit-rate, and the tolerance setting (it's controlled by the -bt switch). it needs to be higher than the bitrate divided by the fps, as in:

tolerante > bitrate / fps

This script might be helpful.

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