[MPlayer-users] retrieve total frame number?
bugfood-ml at fatooh.org
Mon Aug 23 01:46:57 CEST 2004
Martin Ankerl wrote:
> Is there a simple way to use mplayer to retrieve the total number of
> frames of a video? At the moment I use this command:
> mencoder movie.bin -oac copy -ovc copy -o -noskip -skiplimit 0 -mc 0
> -o /dev/null
> which writes the frames when it finishes playing the whole movie. This
> is a bit slow, is it possible to get the frames without playing the
> whole movie?
Well, if you need an estimate, you can use mplayer -identify and
multiply ID_LENGTH by ID_VIDEO_FPS. I don't know how accurate this will
be for variable-fps video.
This should be a failsafe way that is also faster than using mencoder:
$ mplayer movie.bin -nosound -vc null -vo null -benchmark
-nosound disables audio decoding and output
-vc null disables video decoding
-vo null disables video output
-benchmark makes mplayer play as quickly as it can
At the end mplayer will leave a line that looks like this:
V:8591.4 205987 0% 0% 0.0% 0 0 0%
The second number (205987 in this example) is the number of frames.
Note that I haven't actually tried this much, but I think it'll work for
any video mplayer can play.
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