[QUOTE=SmartSped;2186218]Hello, wondering if anyone can help me with this:
On this DVD I’m ripping, it has 29 FPS frame rate. When I try ripping it to a 23 FPS xvid avi, it leaves a bad combing effect (scan lines). Also, if I use the customize feature and compress it down to a 4.7 GB DVD, I get video that bounces very slightly up and down and every now and then I can see the scan lines in it too. This started happening, I believe after version 22.214.171.124. I’m using 126.96.36.199 right now.
Note: this does not seem to occur when ripping a 23 FPS DVD.
Settings I’m using are the same settings I put here in this other issue:
If you need an image capture of what I’m talking about, I’d be glad to post one.[/QUOTE]
I’ll see if I can get the ball started, and maybe others with more tech savvy than I have can step in and take over.
NTSC video is 30 (or 29.97)FPS and a North American std. PAL video is 25 (or in your case 23) FPS and a European std. There is also a slightly different screen resolution involved (NTSC=780X420, PAL=780X456). I’m not sure of the normal (N.A.) AVI FPS rate, but less than 30 would surprise me.
Trying to do a conversion directly from a DVD at 30 FPS to AVI at 23 FPS while skipping an NTSC>PAL conversion seems to me to be fraught with the chance for display irregularities. Dropped frames from the FPS change, and picture instability from the screen size change are a distinct possibility, and your screen jumping and obvious scan line (comb) effect are not surprising.
It may be necessary, to clean up your conversions, to do a format (NTSC>PAL) conversion before you attempt a video conversion (MPEG>AVI).
Again, I’m not an expert in this part of the technology, but from your previous post, I was not aware of a direct correlation between the bit rate employed in a conversion and the length of the file in that same conversion.
I had always assumed that the bitrate was tied closer to the display properties of the file, and the speed for efficient decoding and sampling.
But I could be wrong. Again, now would be a good time for someone with more tech savvy than I to jump in and set me straight.