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Old 1st July 2003, 00:34   #1  |  Link
snowbeach
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MPEG-4 XviD Koepi 24062003-1 Encoder Guide

Hello guys,

a new version of my guide is available now.

MPEG-4 XviD Koepi 24062003-1 Encoder Guide:
- B-frames settings changed.
- 2.1. Ripping and demuxing: The use of the overall track gain is useful for 6ch AC3 tracks. If you are dealing with 2ch AC3 tracks, then it is probably better to use hybridgain.
- cosmetical things

Comments, critiques, etc. are appreciated.

Regards
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Old 1st July 2003, 12:49   #2  |  Link
yaz
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Re: MPEG-4 XviD Koepi 24062003-1 Encoder Guide

Quote:
Originally posted by snowbeach
Comments, critiques, etc.
good & usuful, as usual.

just one thing at the first read. your comments on vhq is a bit contradictory. afaik, all modes of vhq is safe now, no harm on quality (syskin's comment)
with b-frames activated a new scene change detection algo kicks in. it's more sensitive than the old one (syskin, koepi).
vhq1/mbf0 (no b-frame, new scd) works fine but max i-frame not kept (my comment :-(
vhq1/mbf-1 (no b-frame, old scd???) no effect, all keyframes inserted at max.

the bests
y
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Old 1st July 2003, 13:31   #3  |  Link
snowbeach
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Yes, you are right. Forgot to change it. Done now!

PS: Have not changed the version. The VHQ mode changes are in ver 20030701!
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Old 1st July 2003, 19:25   #4  |  Link
Selur
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@yaz: strange, in all the tests I did with vhq&"max bframe"=0, max Iframe intervall was kept,.. is there anything 'specia' about the source you used?
(extremly dark/light/noise/..)

Cu Selur
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Old 1st July 2003, 21:22   #5  |  Link
BiaTch 5.0
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You recommend the use of trellis,
trellisquantbug

edit: good work so far! I look foward to your updates
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Last edited by BiaTch 5.0; 2nd July 2003 at 07:42.
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Old 2nd July 2003, 04:05   #6  |  Link
loni_blues
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@snowbeach,

In your guide it says:
Quote:
Note: Set the Below i-frame distance value (FPS/2) to 12 for 23.976 FPS, to 13 for 25.000 FPS and to 15 for 29.970 FPS.
By 23.976 FPS do you refer to those NTSC movies where Force Film was activated in DVD2AVI and by 29.970 FPS to those where Force Film was not?

Thanks for a wonderful guide!

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Old 2nd July 2003, 06:47   #7  |  Link
Selur
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it's not about forcefilm or not (I prefer IVTC), but in general fps.

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Old 2nd July 2003, 12:45   #8  |  Link
itsme_4ucz
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Thanks for a wonderful guide!
once again.
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Old 2nd July 2003, 12:47   #9  |  Link
snowbeach
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Some new, minor things added:

MPEG-4 XviD Koepi 24062003-1 Encoder Guide - version 20030702:
- B-frames settings: Suggestion not to go higher than 2 at Max B-frame settings. It is safe to use 2 for low and high bitrate solutions.
- Chroma motion info added (Koepi): Use chroma (color) information to assist with motion detection - usual MPEG-1/2/4 encoding just uses luminance information for searching the motion.
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Old 2nd July 2003, 16:26   #10  |  Link
Selur
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"just uses luminance information for searching the motion."
Oh, I thought that it kind of additionally uses the luminance information, so thanks for the info

Cu Selur
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Old 2nd July 2003, 20:47   #11  |  Link
loni_blues
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Thanks Selur, but may be I did not express myself clearly. What I wanted to know was if the value in FPS in the notes refers to the one of the dvd2avi project made by Robot4Rip (which activates force film automatically if the movie is NTSC Film > 95%). Therefore, for instance, if the movie is NTSC Film < 95%, the value I get when I open the dvd2avi project in GK is 29.970. Iīd like to know if that is the value to which the notes in Snowbeachīs guide refer: the value in FPS you get in Gordian Knot when you open the dvd2avi project made with Robot4Rip.
Quote:
Note: Set the Below i-frame distance value (FPS/2) to 12 for 23.976 FPS, to 13 for 25.000 FPS and to 15 for 29.970 FPS.
Loni Blues
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Old 2nd July 2003, 21:19   #12  |  Link
Asmodian
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@loni_blues
It is not necessarily that frame rate (it is if you don't do anything else that changes the FPS) but the frame rate of the video during the encode to xvid. If you did not do a force film but do a IVTC then use the 23.976, if you do a bob then use a below i-frame distance of 30 (because the 29.970 frame rate goes to 59.94 when doing a bob) - it is the frame rate of the final video that is important.
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Old 3rd July 2003, 00:50   #13  |  Link
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Thanks a lot, Asmodian! I think I finally got it.

Loni Blues
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Old 4th July 2003, 01:21   #14  |  Link
loni_blues
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@snowbeach,

In your (excellent) guide, it says:
Quote:
If FPS equals 29.970 you did not choose Force Film in DVD2AVI and will have to perform IVTC (explained later on in the guide). For now set FPS to 23.976.
And later:
Quote:
If you activated IVTC at Field Operations the IVTC in avs -> correct Frame Count will not be grayed out and you have to check it.
The thing is that if I set FPS to 23.976 and then activate IVTC at Field Operations, the IVTC in avs -> correct Frame Count does remain grayed out and canīt be checked. I thought it might be a bug in GKnot, but I did some research and found this:
Quote:
Originally posted by len0x
I think I know the cause of both your problems.

1) When using IVTC - never set fps manually to 23fps! If you chose to IVTC on save AVS window, then all you have to do is to make sure check box on encode window is set properly - "IVTC in AVS" (and GK automatically will take care of frame rate).
http://forum.doom9.org/showthread.php?s=&threadid=55125

and:
Quote:
Originally posted by TheWEF
N_F is right. you should not change fps manually but use the checkbox instead. actually this only makes a difference if you are encoding credits separately. overhead calculations are more exact if creditsstart is recalculated as well.

wef.


So, may be doing both things is incompatible and it seems best not to set the FPS to 23.976 in the Frames tab in Gknot.

See you,
Loni Blues

Last edited by loni_blues; 4th July 2003 at 01:24.
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Old 4th July 2003, 05:39   #15  |  Link
trance
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Thanks, I'll give it a read.
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Old 4th July 2003, 10:07   #16  |  Link
DanielSun
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Thx for the great job!

Regards Daniel.
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Old 6th July 2003, 18:13   #17  |  Link
trance
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Quote:
So, may be doing both things is incompatible and it seems best not to set the FPS to 23.976 in the Frames tab in Gknot.
If this is true, for compressiblity test, FPS should be set to 23.976 to get the correct value (because it will be 23.976 by enabling ITVC later on) and after the test, it should be set back to 29. Correct?
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Old 12th July 2003, 19:18   #18  |  Link
DDie
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First of all congratulations for this guide. As I'm don't have time to study this forum every day or test the best settings myself it helps a lot to find good settings.

There is only one thing that could be changed:

You write that one should use h.263 above bitrates of 900kbps. I think that doesn't help much, because depending on the resolution you choose it could be more than 900kbps.

You could be more precise by indicating the bits/pixel ratio. (even though it strongly depends on video you use (action film or a documentation..))
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Old 23rd July 2003, 00:35   #19  |  Link
yeeyy
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Hi, I am a n00b in DVD encoding.

I have download the guide following the instruction. Currently I am stuck in chapter 2.

Do I need to start Robot4Rip before carry out the encoding?
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Old 29th July 2003, 13:22   #20  |  Link
yeeyy
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A gentle bump.

Guys, no answer???
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