[MEncoder-users] Re: Thumbnail creation
jsd at cluttered.com
Wed Aug 16 21:05:13 CEST 2006
> let me explain what the application looks like. The whole thing is a webapp
> written in Java, mplayer/mencoder is called from within there using
> Runtime.getRuntime().exec(command). What I want to accomplish now is to
> create a sort of rough overview of the video file using thumbs. So I take
> the length of the file in seconds and calculate points I want to have a
> thumb from. So I need to be able to specify for example for a 50 sec. video
> to make thumbs at e.g. 10/25/40 sec. And since this does not work out with
> -ss, and only having the ability to make thumbs at the very begining of the
> file is not an option, I'm looking for a different solution.
first run mplayer -identify to find the length and fps. multiply to get
the total number of frames. divide by the number of thumbs you want,
then use -vf framestep=x to skip through the video.
i use that in combination with vf tile to create one output jpeg with
multiple smaller thumbs inside it.
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