On Mon, 20 Sep 2004, Martin Collins wrote:
> What Steven said about 3 pass.
I had hoped to say "forget it - it's twice the encoding time for
relatively little benefit". For causual viewing it's not worth
the extra time and for archival purposes I'll create a high rate
mpeg-2 stream for a DVD.
> Stick with two pass unless you're using a high bitrate and don't much
> care how big your final file is.
I know the mplayer/mencoder folks verge on being fanatical about
the 2 pass method but the times I've used it there was little to no
difference (except for the elapsed time - 2 pass takes 2x as long ;)).
The 3 pass method has fallen out of favor since it can lead to A/V
sync issues (I think that was the problem - have to check the mailing
list archives to be certain).
Oick a bitrate using 'calcbpp.pl' (in the MPlayer TOOLS/
directory) - or if the filesize doesn't matter then use a high
rate (but be careful - playing back high bitrate MPEG-4 takes a lot
of cpu power).
> yuvdenoise may or may not be more effective than hqdn3d but it is waaay
> slower. I suggest you just add hqdn3d to pass 2 and 3 of the script,
That's because hqdn3d isn't as effective. It's better than nothing
though. I have a feeling though that any filtering/encoding is going
to be waaay slow on a 500MHz system :)
> after deinterlacing and before any crop or scale.
It's a matter of taste. Seeing the interlacing is less bothersome
to me than the effects of deinterlacing. Deinterlacing can be done
at playback time (often with a choice of how it's done so you can
select the method that looks the best).
But since it sounds like the goal is computer playback in small areas
(384x288 or so) this might be worth thinking about:
For lower ("VCD") resolution I think it's better capturing at the
1/2 size (384x288 for "PAL") to begin with. This will be progressive
(since it's only 1 field) and then you don't have to deal with
deinterlacing at all. That would be less data captured, less to
denoise, and no scaling - quite a speedup factor when all of those
steps are taken into account.
Cheers,
Steven Schultz
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