[MPlayer-users] BUG: sstep is broken

Hugo González Monteverde hugonz-lists at h-lab.net
Sun Aug 14 02:32:00 CEST 2005


I had the same problem, one of the issues may be that your videos are 
too short...? Remember you can only seek to a keyframe. I actually have 
a box doing batch thumbnailing =) and whenever a video doesn't come out 
right I reencode it (automagically of course) with mencoder in order to 
have a keyframe every 1 s. This of course makes files huge, but as it is 
only for a tempfile from where to get the thumbnails, just works for me.

In any case I have suffered from the same number of problems with it not 
detecting EOF, but I simply calculate how many frames I should get and 
do  -frames option. I also parse mplayer -identify for knowing the 
lenght of the file in seconds.

Hope it gives some insight into your specific application, if not to the 
bug itself of course.


Pavlos Mavridis wrote:
> Hi
> I'm using mplayer with the -sstep option to create video thumbnails and 
> I have some problems. When the player reaches the last frame strange 
> things happen.
> In most cases I get repeatedly the following warning
> [mpeg4 @ 0x8480348]warning: first frame is no keyframe
> and the last frame/thumbnail keeps replicated until I manually close the 
> player.
> In some other cases I don't get output at all until the playback reaches 
> the last frame, which keeps replicated until I exit the player.
> To replicate the above behavior just try the following with any avi/wmv
> mplayer -sstep 100 foobar.avi
> Interestingly, mpg files seems to work correcly.
> Thanks
> Pavlos
> ps. keep me in the cc because I'm not subscribed on the list.
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