Let's try this again and sorry for breaking the threading but SF.Net's
bogus verification (probing the <> user) bounced yet another mail item
on me :(
On Tue, 28 Jun 2005, Steven Ellis wrote:
> Really interesting thread on the strengths and weaknesses of different
> ways to encode material.
A bit heated (my fault) but interesting ;)
> Have any of you looked at the two pass MPEG2 code used in avidemux2. Its
No thanks. Most of my encoding runs already are in the 14 to 16 hour
range. I've no real desire to double that :)
> For example I take an off air D1 PAL video capture, edit out adverts to
> 45 minutes approx
As one of my brothers keeps reminding me D1 is a digital tape recorder
format (as is D-5, D-9 and so on). In the "biz" (broadcast TV) they
call it "601" (as in Rec.601) video :)
> 1. Clean up the black borders, ie remove non-visible junk.
Good idea - but I wouldn't have thought digital TV would have much
junk.
> Yes I know I should leave it interlaced, but a lot of my material was a
> film -> TV transfer and de-interlaces really well.
Ummm, I make a distinction between reverting a pulldown and
deinterlacing. It sounds like what you're doing is reverting the 2:2
pulldown used by PAL much as I, in NTSC-land, would revert the 3:2
pulldown.
To me that's not deinterlacing. I think of Deinterlacing as taking
a ~30fps interlaced (non-pulldown) video and creating a ~24fps new
video stream. That's a lot harder to do than matching pairs of
fields from a pulldown processed stream :)
> 3. Use the Mplayer HQ Denoise filter.
Hmmm, on the MPlayer mailinglists I've seen that filter disparaged
and mention made of not using it. When I was using 'mencoder' to
do encoding I did use it and thought it was ok (seemed to be mild,
almost not noticeable in effect).
> 4. Encode to MPEG 2, target filesize of 1300 (3 episodes per DVD with
> Audio), Max Bitrate 8000
Just as easy would be to take the number of minutes of video and
divide into 560 :) I'll skip all the boring arithmetic but the
rule of thumb given in DVD Studio Pro's documentation is to take
(560 / minutes) to get the average bit rate in megabits/sec. So for
3x45 minutes you get 4.148 or ~4148Kbit/sec
> With the deinterlaced video I get an average Q of 3-4 and pretty damn
> good video quality.
Undoing the pulldown and encoding the progressive frames for some
of the VHS tapes I've done recently I've gotten down around 2-3 :)
Pretty amazing what doing a 10bit uncompressed capture and
pre-processing the data with FinalCutPro can do :-)
> Have a play and see what you think. It also has useful filters for
> telecine etc.
yuvkineco works quite well too once the field order is switched to
top field first.
One possible problem that hasn't been encountered yet (but no doubt
will eventually) is a video that has mixed telecined film and NTSC
video. The tools I've seen don't know how to deal with mixed frame
rates - switching between 24 and 30.
For now I think I'll take a break and go on vacation for a couple
weeks :-)
Cheers,
Steven Schultz
-------------------------------------------------------
SF.Net email is sponsored by: Discover Easy Linux Migration Strategies
from IBM. Find simple to follow Roadmaps, straightforward articles,
informative Webcasts and more! Get everything you need to get up to
speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click
_______________________________________________
Mjpeg-users mailing list
Mjpeg-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/mjpeg-users
