Dave Stevens <geek <at> uniserve.com> writes:

> ffmpeg -i ./onemountainhour%04d.jpg -vcodec mpeg4 -framerate 30 out.mp4

You are neither specifying a bitrate nor constant quality, 
the default is 200k which is not possible for the given 
resolution. You can speed up encoding by specifying a 
constant quality with -qscale 10 (lower is better).

x264 has options to allow faster encoding, filesize will 
still be smaller for a given quality than mpeg4.

Carl Eugen

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