Isn't this: >True enough. But the cropping tool is mencoder, which is quite >generic. From what I have been told, A'rpi (mencoder >author/maintainer) doesn't much care for interlace output, so >everything is (de-interlaced to) progressive anyway.
mutually exclusive with this: >Well, since my output device is interlaced (television) maintaining >the interlacing and parity is important. ? ;^) >> I don't know anything about MPEG4, but I suspect that >> the info that your source is interlaced isn't being encoded, or that >> mplayer isn't treating it as interlaced when you finally play it back. > >Doesn't matter actually, as long as field parity is maintained, >because mplayer outputs both fields at the same time in a >non-de-interlaced frame every 1/29.97 seconds, and the G400 takes that >full frame and displays each field for 1/59.94 seconds maintaining the >field parity. How does the G400 know which field to display first, if the interlacing information isn't maintained somewhere in the datastream? (A field has two "parity" bits: top-bottom and first-second.) I'm not trying to pick a fight --- it's just not apparent to me what is really happening with the interlacing. Either (1) it is being preserved throughout the chain; (2) the initial mencode is deinterlacing, so the issue is no longer an issue; or (3) you've been lucky so far with your G400/DirectFB choosing the correct field dominance. If you start to get tearing/combing artifacts in the future, you'll know it's (3). >> (If the G400 TV-out >> is truly interlaced, tell me how you did it, because I have a G400, and >> it would be good to know it does that! :) > >Check out DirectFB. Anything past 0.9.15. You should of course use ... >indistinquishable from broadcast (or DVD or whatever). Very much well >worth it if you have a G400 and the CRTC2 pigtail cable. Cool, 'cause I have both. I'll try it out, sometime, when I find that pigtail cable... >> If the output decoder/device isn't aware of the interlacing, it will >> end up mixing the chroma together between fields. Yechh. > >What is the visual result? Is it catastrophic (i.e. anyone and >everyone will notice it) or is more subtle that only videophiles will >notice? I use mencoder to convert lavrec's MJPEG to MPEG4 using >FFmpeg's libavcodec. The results seem to be fine. I have no idea. But, it can't be any worse than VHS, eh? -matt m. ------------------------------------------------------- This SF.NET email is sponsored by: SourceForge Enterprise Edition + IBM + LinuxWorld = Something 2 See! http://www.vasoftware.com _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
