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Currently I am using this command to extract the images:

ffmpeg.exe -i 10fps.h264 -r 10 -f image2 10fps.h264_%03d.jpeg

But how can I improve the JPEG image quality?

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    What is wrong with the current quality, apart from that it is not "good"? – bjoernz Apr 19 '12 at 11:05
159

Use -qscale:v

Use -qscale:v (or the alias -q:v) as an output option. Effective range for JPEG is 2-31 with 31 being the worst quality. I recommend trying values of 2-5.

To output a series of images:

ffmpeg -i input.mp4 -qscale:v 2 output_%03d.jpg

To output a single image at ~60 seconds duration:

ffmpeg -ss 60 -i input.mp4 -qscale:v 4 -frames:v 1 output.jpg

This will work with any video input. See below if your input is MJPEG.


MJPEG

If you input is MJPEG (Motion JPEG) then the images can be extracted without any quality loss.

The ffmpeg or ffprobe console output can tell you if your input is MJPEG:

$ ffprobe -v error -select_streams v:0 -show_entries stream=codec_name -of default=nw=1 input.avi
codec_name=mjpeg

Then you can extract the frames using the mjpeg2jpeg bitstream filter:

$ ffmpeg -i input.avi -codec:v copy -bsf:v mjpeg2jpeg output_%03d.jpg

Also see