Hi, > > Tutorial time again, though ;-) First, what do these parameters mean (it's > not obvious from the man page)? > - -4 2 -2 1
I dont know much about mpeg2 encoding to comment on that; I can only say that -4 and -2 takes an argument in the range 1 to 4, smaller numbers lead to a more thorough motion estimation search which means better quality at the expense of speed. From my own experience and from what I have learned from this list -4 2 -2 1 runs much faster than -4 1 -2 1 and still produces almost as good an output as the latter. Hopefully you will get more expert explanations from others. > > Then, the problems I've had appear to be caused by the way I have created the > avi. This was done by grabbing a series of single frames, creating 25fps > avis from them, creating transition avis, then writing an eli that could > bring them together into one. Is there any way I could have lessened the > chances of the problems I've had? Could they, for instance, be made > interlaced in some way? And would it have helped? Not that it would have helped, but in general its not a good idea to de-interlace unless absolutely necessary. Was there any special reason to deinterlace the input? I would have kept it all interlaced if the source is interlaced. You lose quality when you de-interlace. > > Or is it maybe that I didn't get a good quality sound grab in the > first place? I am not sure I understand. You mean audio quality? > If so, again, recommendations would help. > > Finally, the main recording is in the form of a series of avis > (filename02%.avi), interlaced. The coda is formed from a series of > non-interlaced avis. I know I can't create a transition between the, but > will I encounter problems when I try to stitch them together into one long > production? lav2yuv will complain if you try to mix interlaced and progressive sources. One can think of some ways of handling this without re-encoding but it may be easier to re-encode coda as interlaced with the same field order, frame size, aspect ratio and fps as the rest of the video. Selva ------------------------------------------------------- SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift. http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285 _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
