Re: GStreamer capturing video frame

[zentara]

There is a simpler way of doing this. :-)

mplayer -vf screenshot tv:// driver=v4l2:width=800:height=600:device=/
+dev/video0 -fps 15 

# and that gave me 800x600 video, and after I pressed 's' i obtained 8
+00x600 in the snapshot.
# q to quit

# I did the same for 1024x768, 1280x1024, and 1600x1200 and obtained a
+ 1024x768, 
# 1280x1024, and 1600x1200 video and snapshot respectively.

# or get shots from a video
# mplayer -vf screenshot some.avi

# use keys
# 1 and 2 - Adjust contrast.
# 3 and 4 - Adjust brightness.
# 5 and 6 - Adjust hue.
# 7 and 8 - Adjust saturation.

I know it isn't Perl, but you can run it via Perl's system command. :-)

[pablacho]

Hi zentara
thanks for your reply!
I think that might do the trick, but I don't think that that is a solution for me... this is a PC that will run as an embedded system with no keyboard or mouse (that's why I need that paralell port button I've mentioned).
I've tried before with ffmpeg (that I think is the base that mplayer uses) and the results were not that good...
Thanks again for answering! I'll just keep looking!!

Has anyone been able to set a callback from a pad in GStreamer? I think that through that I might be able to take my picture, but I found absolutely no documentation for Perl :-(
in c this is made through
 gst_pad_add_probe(GstPad *pad,GstPadProbeType mask,GstPadProbeCallback callback,gpointer user_data,GDestroyNotify destroy_data);
But i did't found the Perl equivalent...

[zentara]

Your best bet would be to ask on the c libs maillist at gstreamer maillists, then try to port any answer to the Perl Gstreamer module.

Also see Webcam Streaming to Perl/Tk with ffmpeg in case you havn't seen it. It may have a clue or 2 for you.