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

[Ralph Metzler <rjkm@convergence.de>]

Marcus Daniel writes:
 > On Thursday 21 June 2001 23:55, you wrote:
 > 
 > > Maybe you are using the wrong color format or the SAA7146 is
 > > delivering the wrong one?
 > > I did not test all color formats of the SAA driver. There are
 > > newer versions of the driver available from the auhthor (Michael
 > > Hunold) but I did not move to that one yet because it only supports
 > > V4L2.
 > 
 > How would I do that? I cannot find additional module parameters. Output modes 
 > seem to be defined in saa7146_defs.h, is there a tool for changing that ? Or 
 > has the /dev/video using programm to do it?


Yes, via the standard Video4Linux calls.


 > 
 > >
 > > The "snow" and "ghostly movements" can be caused by PCI transfer
 > > problems on your motherboard, typically on those with VIA chipsets.
 > > The newer kernels make some latency adjustments on some VIA chipsets.
 > > Before that we also had problems on our VIA board. They are gone now.
 > 
 > My board has an i815.


OK, I don't know if this one makes problems.
But if your composite TV signal is fine and the errors are only in the
picture on the PC monitor this is definitely some problem with the DMA
transfer. 


Ralph


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