On 07/08/2010 04:35 PM, Ivan wrote:
On 07/08/2010 04:02 PM, Devin Heitmueller wrote:
On Thu, Jul 8, 2010 at 3:52 PM, Ivan<ivan.q.public@xxxxxxxxx> wrote:
Yep, that gets rid of the vertical stripes but adds in a lovely
horizontal
shift:
http://www3.picturepush.com/photo/a/3763906/img/3763906.png
The "horizontal shift" issue is interesting. Does that happen every
time? And did you unplug/replug the device? Try to reboot?
Reboot? What is this, Windoze? :^D
But yeah, it's consistent across unplugs/replugs/reboots.
Ok, the horizontal shift disappears if I switch to 720x480 instead of
640x480.
Does the card always output 720x480 (in NTSC mode anyway), then, and any
scaling is done by V4L?
I also have a question about dropped frames. After running mplayer or
mencoder, I see a line like:
v4l2: 1199 frames successfully processed, -3 frames dropped.
I can only guess that the negative number means that V4L received frames
at a slightly faster rate than the expected 30000/1001 fps. In my case,
it would seem that my SNES is producing something more like 30.05 fps,
and so V4L reports a "negative" dropped frame every 12.5 seconds or so.
It would also seem that V4L doesn't actually discard any frames, but
still passes them on to mplayer/mencoder, because mencoder shows an
encoding fps of 30.04 (and it will skip a frame every 12.5 seconds or so
unless you pass it -noskip).
Am I right about all this?
Ivan
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