On Fri, 20 Aug 2004, Steven M. Schultz wrote:
Oh, that's an old version but even 1.6.2 doesn't have y4minterlace.
There are a few new tools/utilities that are only in the CVS version. I think it'll be necessary for you to get the CVS version built. If you have fairly recent versions of autoconf/automake/libtool the CVS version of mjpegtools should not be too hard to build.
Thanks, I got it now.
There's just one thing I'm worried about. For testing purposes, I created a little ImageMagick script that generates a scrolling end-credits sequence. It's just a picture of 1024x5000 pixels shifted up a little each frame, cropped to 1024x576 pixels. When I feed the frames to y4minterlace and play the generated video in Xine, it looks horrible without interlacing (of course it does) but using de-interlacing (linear blend) makes the image look fuzzy and the thin horizontal lines of characters like 'H' and 'E' are still flickering. That last defect is of course due to the picking of odd/even scanlines. Could this be solved by having my script generate frames at half vertical resolution and combine *all* scanlines of frame A with *all* scanlines of frame B into one interlaced frame? Or will that result in flickering when viewed on a TV?
I also tried generating pairs of identical frames so that the interlaced frames should look exactly like the original progressive ones. This should look *very* smooth on my CRT, and probably on TV as well. The downside of this solution is that I loose temporal resolution. I need that temporal resolution to make quickly scrolling text look smoother on TV. Apparantly that also means that it will look worse on a CRT... Sigh...
When I create a MPEG with identical frame pairs, it looks very smooth indeed when viewing with MPlayer (no de-interlacing), but not when viewing with Xine. I need to turn on de-interlacing to get a stable image, no idea why de-interlacing would be necessary.
The fact that my video looks bad on my CRT is not the biggest problem (I know scrolling text is about as bad as things can get). I am much more interested in how it would look on TV. Unfortunately, I don't have a DVD burner yet, so I can't test this for real. How can I be sure that my video will look smooth on TV? When I encode my generated frames to progressive video, it always looks perfect. I would guess that interlacing the frames does not change anything (apart from the frame rate), it's just that the video looks worse when viewed on a computer monitor, that's all. Is that correct?
Thanks,
Dik
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