[MPlayer-users] No video output on ivtv/v4l2 TV out

Peter Daum gator_ml at yahoo.de
Sat Mar 1 11:12:49 CET 2008

Thank you so much!
That's certainly nothing I would have found myself.After

  v4l2-ctl --set-fbuf=chromakey=1

all the various output drivers that I tried
(ivtv, v4l2, cvidx) produce a visible output :-)

The sound (when using the hardware decoder) is still extremely
jerky and often fails (while cat > /dev/video16 works fine) -
I'll look into this some more ...

                     Peter Daum

Russell Treleaven wrote:
>>> What happens when you do this?
>>> "cat someVideo.mpg > /dev/video16"
>>> Where someVideo.mpg is an mpeg2 encoded video and 
>> /dev/video16 is the 
>>> mpeg decoder.
>> The sound plays fine, but the screen stays dark :-(
>> Regards,
> I think we can rule out mplayer now.
> The following line is from dmesg output
> ivtv0-fb: Display size 720x480 (720x480 Virtual) @ 8bpp
> When I "cat someVideo.mpg > /dev/video16"
> I don't see anything because the framebuffer overlay defaults to opaque.
> To make the framebuffer overlay transparent try this.
> v4l2-ctl --set-fbuf=chromakey=1
> I apologize to the list for going off topic.
> Sincerely,
> russ at else.net

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