On Sun, 28 Jan 2007 22:23:31 +0100 Florent Rougon <[EMAIL PROTECTED]> wrote:
> Hi, > > I'd like to ask a little question. When transcoding with: > > transcode -i source.mpg -o /dev/null -m audio -y xvid4,null -w 1930 \ > -b 128,0,0 --export_par 9216,4896 --progress_rate 20 -R 1,xvid4.log \ > -c 14145-159874 -j 2,3,0,3 -J pp=ci > > where I suppose only '-y xvid4,null' and '-j 2,3,0,3' are really > relevant to the question, I get (with transcode CVS from today): > > [transcode] warning: left/right clip must be even in YUV/YUV422 mode > [transcode] warning: left/right clip must be even in YUV/YUV422 mode > > I'm wondering: the clipping may be odd on the left or on the right, but > if the resulting image *width* and *height* are both even, it should be > OK, no? Yes it should. Final frame size matters most, it should (for performance and for avoiding artifacts) be 1) even 2) multiple of 8 or, better, 16 Some codecs just warns when missing above conditions (one or both), others will just stop. As general rule, if transcode don't bail out, there are probabilities that final output will be something viewable. Except for bugs, of course :) > And transcode doesn't stop after the warnings, so it *seems* to be OK > (and I have actually transcoded streams with these warnings with > transcode 1.0.2 and didn't see any problem that seemed related to the > warnings; the reason I am testing the CVS version now is that I somtimes > have A/V sync problems, and the last one I had wasn't a constant delay > throughout the stream, therefore I don't know how to fix it...) Whe are fully aware of poor A/V sync support, but fixing this properly (= without doubtful hacks) require _*a lot*_ of work, i.e. deep changes in core and in overall codebase. We have just started building the foundations of this work on 1.1.0 cycle, but nothing user-visible will come out before circa 1.3.0/1.4.0 at this rate[1]. +++ [1] given current resources this will take time. And we're not happy of that. Help always welcome. Bests, -- Francesco Romani - Ikitt ['people always complain, no matther what you do'] IM contact : (email first, Antispam default deny!) icq://27-83-87-867 tiny homepage : http://fromani.exit1.org (see IDEAS if you want send code!) known bugs : http://tcfoundry.hostme.it/mantis (EXPERIMENTAL)
