[MPlayer-users] Thumbnail of video?

[Ivan Kowalenko]

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On Aug 22, 2006, at 12.37, Dan A. Dickey wrote:

> I'd like to use mplayer to generate a jpg thumbnail of
> a video.  The problem is that there are many videos,
> some of which have black intros.  How do I skip these
> to get an actual frame from the video?  I know I can
> skip N frames, or skip to time 0:15 or some such, but
> I really have no idea of the length of the black intro
> part.

You could always guess.

> Is there a command option that can "scan" for
> an "interesting" frame?  I see the video filter 'blackframe' -
> would this be what I want to use?  At the moment, I
> can't try it out as my present version of mplayer 1.0pre8
> doesn't have it.  It must be in svn head.
> Alternatively, can I skip frame until an average luminance
> value is hit?  How can I do this?  Thanks.

Why not just skip into the video by a random time between 30% and 60%  
complete, and then take a frame from there?

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