[linux-dvb] Re: Strange output from /dev/video

[Marcus Daniel <danielm@uni-muenster.de>]

Hi all!

Last week I whined about some strange video output with /dev/video in 
combination with ffmpeg (ffmpeg.sourceforge.net).

Ralph kindly steered me into the direction of v4l calls and also pointed out 
that he didn't test all the palettes.

Well, it turns out that ffmpeg only supports YUV420P (at least that is what 
is set in the sources). Using my webcam, which supports YUV420P only, ffmpeg 
works, using the dvb driver in 420p, I get the  palette problems. Both use 
mmap.

Maybe that is the problem?

On the other hand, does somebody have a snapshot tool which can be set to use 
VIDEO_PALETTE_YUV420P for opening /dev/video? Maybe ffmpeg does something 
wrong (it's quite beta). And I will pester the author about supporting other 
palettes, thats userspace stuff anyway the kernel developers say....

I will look some more into the saa7146 driver.(And dream of understanding 
something ;-) )

  Marcus


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