> I was wondering if I could ask for advice on high quality DV capture. > > I am using: > - 1.6G Athlon system > - standard RH9.0 > - latest dvgrab code > - IEEE 1394 card (TSB12LV26 using TI chipset with ohci1394 driver) > - SCSI (IBM DDYS-T18350N drive, AIC-7892A U160/m card) > > Even with my SCSI HDD I am seeing noticeable frame drops in the captured AVI. > > What is the best way to go about finding the problem ?
You don't say what you are capturing, or with what, but I capture DV over IEEE1394 with dvgrab on a K6-2 450 MHz to a nothing-special IDE drive with no problems at all. I do get frame drops, however, when the source is bad (flickers, etc.) and my DV camera (used in AV capture mode) loses sync. It seems that rather than pass bad frames, it prefers to pass no frames. Perhaps this is your problem? (Although you did say "high quality".) I'm not using the stock RH9 kernel, but I think I did at one time. They have been fiddling with the ieee1394 code a lot. Especially dv1394, which was broken in 2.4.20 I think. I just capture with raw1394. Oh, and at some point I modified the dvgrab code to make the capture buffer larger, but now I think that was probably not needed. I suppose you might also want to set a negative nice value for dvgrab and make sure nothing else CPU-intensive is running, but I've done some torture-testing and even my pathetic machine doesn't skip. Watch top while you are capturing, and see if the CPU is maxing out. Dan ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
