[MPlayer-users] Re: mplayer screen snapshots

[Sycotic Smith]

Well, to put it plainly, I have no clue where to start on this, either. I was hoping someone on the list would pick it up and run with it, but no luck yet.  I did find that ksnapshot works great if you're using the X11 or SDL outputs, but doesn't if the vo uses any form of overlay.  I forget how I got it to snap the frame without pausing, but it does work kinda how I was wanting it to, though in your case if the ccd camera stream is live, doubtful you'll know the exact frame you'll need.  Here is a suggestion, tho: instead of just watching the stream, use mencoder to copy it to disk, then watch it with mplayer and pause to take screenshots with ksnapshot. Or use vo png and tell it what frames you want. I suggest reading through the docs and manpage to find how to use "-ss" and "-frames" for this. Problem with png/jpeg/gif/etc vo's though, they always give you frame 0 no matter what, which is usually black or white depending on your vid.

Also, I suggest sending the same question you sent me to the mailing list, and subscribe until you get an answer maybe, but it is high-traffic of late.

Happy capping!
/SycOtiC Smith

> Hello Smith,
> 
> I wasn't directly on the mplayer list and found your answer just by an 
> accident using google. So is there currently somebody
> who could look at it ? Or could you give me a hint where to start - I 
> did nothing with video stuff up to now but c++ is not a problem.
> I think this feature is really heavily needed. I my case I'm using 
> mplayer to look at videostream from ccd camera during an experiment
> and need to shot some pictures.
> 
> Sam
> 
> >I have been thinking about this for some time actually, but never thought it 
> >should be a part of mplayer until now, this post gave me a new idea.
> >
> >As mplayer stands right now, it has several vo's that can handle this already, 
> >eg jpeg, gif89a, png, tga, etc. and it would be useful to be able to capture 1 
> >frame no matter which vo you are using.
> >
> >Here is my idea: Use the cmdline stl 'mplayer -vo x11 file.avi -grabber=png' 
> >and bind a key (like 's' for snapshot) that when pressed captures the frame as 
> >a png.  Of course this would probably over-complicate matters, since you would 
> >have to convert cs on-the-fly if it's not the same, but AFAIR this can be done 
> >with SWS and/or vf scale.  I have no way of implementing this myself, this is 
> >just my thoughts, since we have been getting alot of requests for stlt recently.
> >
> >/S. Smith

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