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I am trying to use the Seonsorray
611 frame grabber to grab images from an NTSC source. I use V4L2 and bttv-0.8.40 with Redhat 7.2 and kernel 2.4.19-pre8+ with
patches. When I query the capability of the card (using VIDIOC_QUERYCAP), the V4L2_FLAG_READ is on (and maxframerate =30). I therefore use the read command,
and I can only get about 10 frames per second. I am reading NTSC with 640x480 image
size, 8 bits per pixel. I
have 2 questions: I would like to increase the frame rate to 30
fps, but I am not sure if I can do that using read. I would therefore like to use the
STREAMING option so that I can map the memory (and I hope to get 30fps). Does anybody have experience with this
type of card or similar? How can I
increase frame rate with the read command? Can I use the STREAMING option
although V4L2_FLAG_STREAMING is
not on?
Lionel |
