On Thu, Jul 8, 2010 at 5:33 PM, Ivan <ivan.q.public@xxxxxxxxx> wrote: > 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? That card does have an onboard scaler, although it's not clear to me why it isn't working. Exactly what command line did you use? > 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. Yeah, I don't know. You would have to ask the mplayer/mencoder people. > 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? Again, this would be an mplayer/mencoder thing. Devin -- Devin J. Heitmueller - Kernel Labs http://www.kernellabs.com -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
