Well, since I played a bit with this a bit myself, I can suggest an
mencoder command, which I've seen to work well with MJPEG videos (but I
would expect it to work OK with other formats as well):
$ mencoder -speed 25/30 -ofps 25 -srate 44100 -vf harddup MVI_7613.avi
-ovc copy -oac pcm -o weird_MVI_7613.avi
Change the -srate argument to your desired output sound rate (which is
most likely the same as input). The problem with this is that voices
sound really weird. It's a light slow motion, after all.
You may run a small pitch operation, as suggested here: (I haven't tried it)
http://jorgenmodin.net/index_html/archive/2009/12/06/slow-motion-a-video-and-save-to-file
If the sound gets fairly OK, I don't think that the slowdown in video
should make any difference. Except that you get 20% longer video.
Eli
Eli Billauer wrote:
Richard Rasker wrote:
Hmm, apparently I can use mplayer to perform this trick, but how do I
make MPlayer dump the result in a file instead of displaying it?
Mplayer has a sibling (which is basically the same project), called
mencoder. If mplayer can play it, mencoder can encode it to another
format (or the same).
Note the -ovc copy option, which moves the video stream from input to
output without touching it. As for the sound, you may want to slow it
down, or I don't know what will happen.
Eli
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