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kern/38208: bktr(4) stuck at 12.5 fps in PAL mode with RGB pixel format
>Synopsis: bktr(4) stuck at 12.5 fps in PAL mode with RGB pixel format
>Arrival-Date: Sun Mar 09 16:15:03 +0000 2008
>Originator: Steve Woodford
>Release: NetBSD 4.99.49
System: NetBSD joe.mctavish.co.uk 4.99.49 NetBSD 4.99.49 (JOE) #3: Thu Feb 7
13:55:32 GMT 2008
When sampling PAL video in RGB mode, the bktr(4) driver (using
METEOR_CAP_CONTINOUS) does not supply frames at the full 25 fps rate.
The frames are, instead, supplied at 12.5 fps. If switched to YUV mode,
the driver works correctly; the application receives video at 25 fps.
I don't have an NTSC source so I can't tell for sure if this problem is
specific to PAL. Looking at the driver however, different RISC code is
used for PAL/SECAM RGB compared to NTSC RGB (it's different again for YUV)
which leads me to believe that this problem could be caused by a bug in
the PAL RGB RISC code. There's additional stuff in the PAL RGB code to
deal with VBI data...
Try to sample a PAL video in RGB mode. Note that you get 12.5 fps instead
bktr(4) stuck at 12.5 fps in PAL mode with RGB pixel format
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