Hello I have tested a TW6805 based mini-pci card with the new tw68-v2 driver from git (22 January 2010). First of all: Congratulations! It is really working great. However, I noticed some frame errors here and then. It is not easy to identify what the reason is. It looks a bit like a buffer problem as it happens more often, if there is some load on the system. Here is a simple way how I can reproduce the frame errors: mplayer -framedrop -fs -vo x11 tv:// -tv device=/dev/video0:width=640:height=480:normid=3 With this command, cpu load goes to 100% on my low powered geode system. The frame errors are very obvious. It looks like a vsync problem as the wrong frames always start somewhere in the middle. There is no horizontal shift visible. Reducing the image size: mplayer -framedrop -fs -vo x11 tv:// -tv device=/dev/video0:width=320:height=240:normid=3 gives a drop in CPU load to 13%. No more frame errors. Also using hardware accelerated video playback (xv) reduces CPU load to some 20% and removes the frame errors: mplayer -framedrop -fs -vo xv tv:// -tv device=/dev/video0:width=640:height=480:normid=3 Still, even here, occasionally there are some frame errors, depending on what happens on the system. These can be induced as follows. Using this program: mkfifo /tmp/mp mplayer -framedrop -fs -vf screenshot -vo xv tv:// -tv device=/dev/video0:normid=3 -slave -input file=/tmp/mp </dev/null >/dev/null When this test prog runs, you can issue commands to mplayer, e.g. echo pause > /tmp/mp This pauses mplayer. A second echo pause > /tmp/mp starts mplayer again. Here the first frame shows the error. The same happens if you issue: echo screenshot 0 > /tmp/mp This captures a screenshot and saves it into the current pwd. Again, when mplayer takes the shot, there comes one error frame (probably also wrong vsync). Btw. using instead a bttv based card all these tests run without frame errors. Does this information help to identify and remove the bug? Best regards Michael -- 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
