#356 Negative (reversed) speed

[Eric Raijmakers]

I mean that negative speed it is then video shows from end to start.
Could you have a chance to add capability of using negative speed?

[Eric Raijmakers]

See also https://askubuntu.com/questions/737597/how-to-use-ffmpeg-command-for-reverse-video

(maybe adding support for ffmpegs filters is a good idea)