Hallo > I'm trying to digitize old VHS tapes with a DC30+. > I ran into one clearly reproducible problem: > Capturing at PAL/fullframe (lavrec -q50) apparently works perfectly > with nearly no framedrops or A/V sync problems recognized. If you capture VHS Full size makes little sense, because of the low quality on the tape. -d 2 is usually enought.
> Looking at the resulting avi I can see that sometimes the second field of a > frame is shifted one line down. (there seems to be one line inserted at top). > In order to exclude the possibillity of having a field order problem I looked > a a movie sequence with slow horizontal, but no vertical motion. I converted > the avi into a sequence of pnm-images, one for every field (not frame). > scrolling through the sequence (with xv) it is obvious that the temporal order > of the fields is correct (horizontal motion is in sequence). But it is also > clearly visible that sometimes the 2nd field of a frame is shifted down one > line. The 1st field does not have this problem. This of cause completely ruins > deinterlacing. In order to check my analysis wrote a yuv-filter which shifts > the 2nd field up. After this the bad sequences look good (but the good ones > get bad, of cause). Is it possible to make a short sequence aviable ? > The phenomenon appears and disappeares at random positions of the avi and > stays > for a sequence of frames (sometimes seconds or minutes). When I recapture the > movie the changes (problem on/off) appear at different places, but they > appear. Do you get lost/ins frames when you take a look at the output of lavrec ? > The problem seems not to depend on the video source (I captured from VHS > recorder (playback and tuner) and from DVBT). I tried two Computers > (AthlonXP/32, Athlon64). I bought a second DC30+ from ebay, same problem. > Software is SuSE-93/original kernel (2.6.11.4), mjpegtools 1.8. How many lost inserted frames do you have when you record from a good source like DVB-T or SAT ? A VCR is usually not a good video source. Sometimes it is related to the mainboard when something is "blocking" the data transfer, than the card/lavrec throws away a field/frame. Which zoran driver do you use (The one that comes with Suse kernel or a different one ?) > Is there anyone who experienced the same problem? I know that my DC30 drops sometimes a frame. I belive that it got better with the late 2.6.14 kernel. I have never used a original Suse kernel so I really can't tell if that one would have worked well on my machine. Currently I use a Suse 10 and a 2.6.15 kernel. > Is there a develloper who knows if there is a switch on the DC30+ which could > be relevant in this context? Could my problem be caused by some > misconfiguration of the card? Sorry I don't know a magich switch. I think in the 2.6.11 kernel there is a bug in the DC30 driver that prevented from recording from the SVHS-In. 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 xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 _______________________________________________ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
