reverse video clip with ffmpeg

Dump all video frames

$ ffmpeg -i input.mkv -an -qscale 1 %06d.jpg

Dump audio

$ ffmpeg -i input.mkv -vn -ac 2 audio.wav

Reverse audio

$ sox -V audio.wav backwards.wav reverse

Cat video frames in reverse order to FFmpeg as input

$ cat $(ls -rv *jpg) | ffmpeg -f image2pipe -vcodec mjpeg -r 25 -i - -i backwards.wav -vcodec libx264 -vpre slow -crf 20 -threads 0 -acodec flac output.mkv

Use mencoder to deinterlace PAL dv and double the frame rate from 25 to 50, then pipe to FFmpeg.

$ mencoder input.dv -of rawvideo -ofps 50 -ovc raw -vf yadif=3,format=i420 -nosound

If there is no audio, this command works for me.
cat $(ls -rv *jpg) | ffmpeg -f image2pipe -vcodec mjpeg -i - -vcodec mpeg4 -sameq -r 24 output.avi