Re: [gentoo-user] Logitech C920 HD Pro Webcamera ... view: YES record: NO ?

[meino.cramer@gmx.de]

thegeezer <thegeezer@thegeezer.net> [14-06-10 17:08]:
> On 06/07/2014 04:18 PM, meino.cramer@gmx.de wrote:
> > Hi,
> >
> > the Logitech c920 HD Pro webcam is able to deliver 1920xq080x30fps
> > (H.264).
> >
> > Now I am trying to display (watch) and record the video stream.
> > Currently I am using guvcview.
> >
> > Most of the time watching is not an problem: no video delays, no
> > frame drops, no ultra low fps...wonderful!
> >
> > But beware of pressing the "record" botton...
> >
> > KABOOM! guvcview ends with an error message, which does not say
> > anythong to me...:
> >
> > (guvcview:19104): Gtk-CRITICAL **: gtk_widget_set_sensitive: assertion 'GTK_IS_WIDGET (widget)' failed
> > initiating video file context
> > STREAM: add stream 0 to stream list
> >
> > I tried "cheese" which interestingly dies similiarily...
> >
> > Since there a zillions of things to tweak with the video and audio
> > setting I still hope that someone got this nice camera running and
> > recording with full hd and audio ....
> >
> > ?
> >
> > Any ide to fix that?
> >
> > Best regards,
> > mcc
> >
> >
> >
> >
> >
> have you tried something like media-video/motion  which would do much of
> this for you (although it would qualify "any motion" as "interesting")
> i just thought that if it is a daemon in the background always with the
> record set this might work ...
> 

Thank you for your help !:))

yes, I tried that software with my previous webcam, which does not
offer HD or Full HD as the current one. With my setup (means: may be I
did something wrong...;) it eats too much resources...there is only
one Linux box for me work and for detecting motions and for recording 
video.

The Logitech offers 1920x1080 Full HD HD264, which needs to be decoded
frame by frame, analyzed and when found "interesting" to be recorded
to disc while further analyzing steps are running.

If motion failed (with my setup) to work with """"low res"""" video
streams I dont think that it will successfully run under the load of 
Full HD.

Furthermore there is a delay of ~1 second between "reality" and video
possbly due to not that fast compression hardware in the camera...