Hallo > > > I am trying to capture a VHS PAL film using a DC10+ card (Pinnacle). > > > The capture works fine, but I have to move the bottom field forward in > > > order to get the correct pair of fields in the same frame. This works > > > fine, but the next problem I don't know how to solve: the interlacing > > > order appears to change every 1-4 frames. First I tried changing the > > That sounds really strange. How much lst/ins frames do you get when you > > record the part ? > > > I think for the 3 hours (using S-Video input), there were about 5 lost > frames, and I'm not sure how many ins. I today rerecorded another 10 > seconds with 0 lst and 0 ins and I've put 14 frames worth here: > http://www.scottwaye.com/lstest.avi I have just looked at the short part (glav -p S lstest.avi lstest.avi -F) and using the cursor key to go frame by frame through the video. It lookes as if the stream really has a weird problem. The text is jumping up/down one line, and is ist lookes as if the fields are wrong labeld (top/bottom).
If the video lookes after some time like the image I have attaced, please check out the mjpeg-howto section: Notes about "interlace field order - what can go wrong and how to fix it". BTW: lavplay/galv has a problem playing back very short videos. Because of that I loaded it 2 times. > > Are you soure that you always have interlacing. When there is no movment > > in the Video > > > Yes even if the there is no movement for some frames you can see a comb > effect. Than I fear that there is a different problem. Can you check your longer files with glav/lavplay, If the error ist the same after some time, than you could change the interlacing with with yuvcorrect. If it keeps changing, I would think that the best version is only to record at halve size. > Thanks for that, I'll take a look and try the whole process again. > Although I notice today that the whole picture jumps up and down a small > amount when played back VCR->DC10->xawtv and this vertical shaking is > visible in the lavrec recorded avi and the encoded mpeg (on the computer > and tv). The video played back VCR->TV is steady. Has anyone else had > this? That is a problem of the SAA IC used. BTW: You @boldtower adress is not in the mailinglist. And so your other post wals held !!! > > There was a patch someone posted to the list a goodly number of > > months back that enabled something that the spec sheet for the DC10 > > video digitizer chip called "vcr mode" or something like that. The > > spec sheet was mostly silent about what it really does, but it's name > > implies that it's for use when capturing from VCR's, and likely it > > just widens the acceptable range of sync values the chip is willing > > to tolerate. You might try searching the archives for that and > > seeing if it helps your situation any. > > I found that post, it was back in 2003. I checked the cvs source and it > has already been applied although I don't know when. It appears to even > be in v1.2 which has a date of 2001 so I don't understand. Anyway I am > using the driver from 2.6.8.1( 0.9.5 I believe) and the change is in > that. That fix should be included into that kernel version. That flag makes the SAA a bit less restrective in the timing. And VCR's recordings should be better. The TV is desigend to work with bad timings ;) The bit D7 is described with a single line in page 39 of the Saa7110. That helps not that much. > I tried some other VHS tapes and they are steady so it looks like you > were spot on about the tape causing some sync issues. Seems so. > When the picture jumps down a pixel there is an extra black line at the > top, so what I could use is a filter that counts the black lines at the > top of each frame/field (not sure which) and moves the window down if > necessary. I guess y4mscaler would be the place for it. I've done a > fair bit of C in the past, so I am happy to have a go at this. Anyone > have any pointers (no pun intended) to get me started? take a look a y4mshift. ;) auf hoffentlich bald, Berni the Chaos of Woodquarter Email: [EMAIL PROTECTED] www: http://www.lysator.liu.se/~gz/bernhard ------------------------------------------------------- This SF.Net email is sponsored by: Sybase ASE Linux Express Edition - download now for FREE LinuxWorld Reader's Choice Award Winner for best database on Linux. http://ads.osdn.com/?ad_id=5588&alloc_id=12065&op=click _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
