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-   -   CQ vs. CQ_VBR ... VERY INTERESTING... (http://www.digitalfaq.com/archives/avisynth/1910-cq-vs-cqvbr.html)

kwag 06-12-2003 01:18 AM

[quote="r6d2"]@Kwag,

Quote:

Originally Posted by kwag
"3. Min BR: does not really matter. " Use 0. -> If your player supports going down to 0, by all means use it :D
Most DVD players have problems below 300Kbps, so we settled for 300 as a safety factor.

Uh... Do you happen to have an image to check this? (lazy moron again) 8).
What do you mean by "Image" :?:
Quote:


"12. Audio: 128 kbps, Joint stereo" -> Joint stereo is a No No :!:
Use "Dual channel", and you can also go down to 112Kbps if you encode with HeadAC3he. If you encode "Joint Stereo", you will kill "Surround 2" signals, and the sound will be messed up on a Prologic II receiver.
12. Audio: 112 kbps Joint stereo for 2 channel input; 128 Dual channel for 5 channel input.

Still a no no :?:
I use 112Kbps almost exclusively, leaving more bitrate for video
Quote:

"13. VBV buffer size: 0 (Auto)" -> Don't use auto :!: Use TMPEG's default. It's more compatible.
But Kwag... 0 (Auto) is TMPGEnc default! (At least on my Plus 2.5 version) Or you mean "standard" defaults of VCD 40/SVCD 112?
TMPGEnc shouldn't be set to "0" :!: At least that's not the default in my PLUS version :!:
Quote:

Another question... I read somewhere that DC bits must be chosen examining the original VOBs with Bitrate Viewer... If it says 10, use 10. Do you agree?
Not for MPEG-1. And for the low bitrates we use here ,it's better to use 8 bits of precision, instead of 9 or 10..

-kwag

Boulder 06-12-2003 01:47 AM

If you don't want to use 'dual channel', please use at least 'stereo' instead of 'joint stereo'. The current MP2 encoders are not very good at joint stereo, you'll get glitches and distortion in the audio track very easily.

r6d2 06-12-2003 02:30 AM

@Kwag,

Quote:

What do you mean by "Image" :?:
A mean a ISO image, a short clip encoded at 10 kbps to check my DVD player and not do it myself :lol:
Quote:

I use 112Kbps almost exclusively, leaving more bitrate for video
OK, great tip.
Quote:

TMPGEnc shouldn't be set to "0" :!: At least that's not the default in my PLUS version :!:
You're right, if you load a template it would to be zero. But look at the help file:

Quote:

VBV Buffer Size
The VBV (Video Buffer Verifier) buffer is the buffer used by the encoder while encoding. It is suggested to let the VBV automatically determine the required size.

If you use a template, the most appropriate VBV buffer size is loaded. Set the VBV buffer to 0 to have TMPGEnc automatically guess the most appropriate size.
It is not the default, but the recommended setting (my fault). So it seems it can handle it sort of dinamically... Maybe sometimes it needs more than what the standard says... Any thoughts on this?

@Boulder,

So I guess that joint stereo is a No no No :!:
:lol:

Thank you guys, I am encoding right now Friends Season 1, 3 episodes per CD with KVCDx3, with all this suggestions of yours.

I did some LBR tests but I was dissapointed. My encodes were by far worse than Kwag's KVCD test disc with the Seinfeld scene. I was aiming at that... 6 episodes per CD, but I guess I did was not able to tweak it right.
Regards,

GetUp 06-12-2003 09:33 AM

Quote:

Originally Posted by kwag
"10. Motion search precision: Use High Quality" -> If you are going to use the new motion adaptive script for AviSynth 2.52, change that to "Motion Estimation". It produces better video with less visible artifacts.

-kwag

About Motion Estimation... This method produce larger video files, and I don't to be sure it's have higher quality... How you compare results from HighPrecision and MotionEstimate? Frame-per-frame or common look on tv-set? If f-per-f - what method do you use?
Thanks in advance :)

kwag 06-12-2003 01:07 PM

Hi GetUp,

Motion Estimation produces better quality and less artifacts. At least on all the latest tests I've done with the current script and AviSynth 2.52. You can clearly see less artifacts around moving objects, and even though the CQ is slightly lower than with "High quality", the results are better :)

-kwag

r6d2 06-12-2003 02:39 PM

Quote:

Originally Posted by bigggt
What about this one

Quote:

17. Burn as SVCD if your player supports it, else use VCD.
Is this right and if so can someone explain a little more please

I understand that so far as we are concerned in this case, the advantage of SVCD over VCD is PBC. You can have seamless chapters instead of tracks.

kwag 06-12-2003 02:47 PM

[quote="r6d2"]
Quote:

Originally Posted by bigggt
, the advantage of SVCD over VCD is PBC. You can have seamless chapters instead of tracks.

You have seamless chapters with VCDs too :!:
You don't need to do tracks/chapter. Use ChapterXtractor to read your .IFO, and Cut&Paste the information into VCDEasy. It will create chapter entry points on your single MPEG file.

-kwag

r6d2 06-12-2003 05:15 PM

Then that leaves us just with selectable subs and multiple audio tracks, which we rather not use anyway in KVCD :?:

kwag 06-12-2003 05:43 PM

Quote:

Originally Posted by r6d2
Then that leaves us just with selectable subs and multiple audio tracks, which we rather not use anyway in KVCD :?:

That's right :D
There are very few players that can handle selectable subs on SVCDs. So that only leaves selectable audio channels on a SVCD as an option :mrgreen:

-kwag

Jellygoose 06-13-2003 05:05 AM

But you can still encode as a KVCD and after that mux as SVCD with 2 audio tracks! :wink:

GFR 06-13-2003 08:00 AM

[quote="kwag"]
Quote:

Originally Posted by r6d2
Quote:

Originally Posted by bigggt
, the advantage of SVCD over VCD is PBC. You can have seamless chapters instead of tracks.

You have seamless chapters with VCDs too :!:
You don't need to do tracks/chapter. Use ChapterXtractor to read your .IFO, and Cut&Paste the information into VCDEasy. It will create chapter entry points on your single MPEG file.

-kwag

At least in my player (Philco), chapters get completely messed up if I do a SVCD with more than 90 min (there's a warning about that when VCDEasy is generating the image). Chapters work fine in VCDs over 90mins.

Boulder 06-13-2003 09:24 AM

Quote:

Originally Posted by kwag
Hi GetUp,

Motion Estimation produces better quality and less artifacts. At least on all the latest tests I've done with the current script and AviSynth 2.52. You can clearly see less artifacts around moving objects, and even though the CQ is slightly lower than with "High quality", the results are better :)

-kwag

Kwag,

is it the same for scripts without the dynamic filtering?

kwag 06-13-2003 09:35 AM

Quote:

Originally Posted by Boulder
Quote:

Originally Posted by kwag
Hi GetUp,

Motion Estimation produces better quality and less artifacts. At least on all the latest tests I've done with the current script and AviSynth 2.52. You can clearly see less artifacts around moving objects, and even though the CQ is slightly lower than with "High quality", the results are better :)

-kwag

Kwag,

is it the same for scripts without the dynamic filtering?

I don't know, because I'm not using any other (non-adaptive) script from now on :mrgreen:

-kwag

Boulder 06-13-2003 12:43 PM

Well, I did a small test and it looks like the motion estimate search produces better quality despite the fact that CQ has to be reduced slightly. I don't use the adaptive filtering because of the damn permanent subtitles in the TV broadcasts here :evil:

kwag 06-13-2003 04:45 PM

Quote:

Originally Posted by Boulder
I don't use the adaptive filtering because of the damn permanent subtitles in the TV broadcasts here :evil:

Are the permanent subs on a black bar below the picture, or are they right on top of the picture :?:

-kwag

Boulder 06-14-2003 04:54 AM

Quote:

Originally Posted by kwag
Quote:

Originally Posted by Boulder
I don't use the adaptive filtering because of the damn permanent subtitles in the TV broadcasts here :evil:

Are the permanent subs on a black bar below the picture, or are they right on top of the picture :?:

-kwag

They are practically always on top of the picture. We are supposed to switch to digital broadcasts in a couple of years and then you're supposed to be able to switch the subs off and change their appearance. At the moment the transmissions are 4:3 so there are no borders (unless the source was specifically made widescreen format). And even if there are borders, a part of the subs is always on top of the picture :roll:

Encoder Master 01-31-2004 09:17 AM

I've tested a lot and here I've a link to compare the CQ and CQ_VBR at a resolution of 352x(240)288 PAL.

TEST: CQ vs. CQ_VBR

If the results aren't good for you download the pics and use the zoom function and you will see CQ is better in every resolution.

kwag 01-31-2004 11:02 AM

Who ever did those tests, probably didn't consider many factors.
We've already proved here that CQ_VBR is better than CQ for resolutions of 352x240(288).
That is, when comparing both CQ and CQ_VBR targets to be the same size.
Those screeen shots don't mention the process, and there is not enough data.
In this threads, we did provide all the data and procedures ;)

-kwag

Encoder Master 01-31-2004 12:22 PM

I don't know clearly what you say, but I've tested a lot of resolutions with CQ and CQ_VBR and in my results you can see the difference. First I've tested a resolution of 480x576, but the artefacts in this Video with CQ_VBR were very high.
And then I've tested VCD resolution. And I don't know why but you can see that there are more blocks with CQ_VBR because this mode has too little weak in high action scenes.
Can't you that the pics on the left side are very shaper than the right?

kwag 01-31-2004 12:40 PM

Quote:

Originally Posted by Encoder Master
I don't know clearly what you say, but I've tested a lot of resolutions with CQ and CQ_VBR and in my results you can see the difference.

Then read this thread from top to bottom again :mrgreen:
Quote:

First I've tested a resolution of 480x576, but the artefacts in this Video with CQ_VBR were very high.
Of course :!:
That's clearly stated in this thread, that above 352x240(288), CQ is better than CQ_VBR.
Quote:

And then I've tested VCD resolution. And I don't know why but you can see that there are more blocks with CQ_VBR because this mode has too little weak in high action scenes.
Can't you that the pics on the left side are very shaper than the right?
Yes, I can see it, and as I said before, the screenshots don't prove anything, because there's no detailed data as to how those samples were encoded.
Again, read this thread from top to bottom, and you'll see the FACTS :!:

-kwag

Dialhot 01-31-2004 12:41 PM

Quote:

Originally Posted by Encoder Master
And I don't know why but you can see that there are more blocks with CQ_VBR because this mode has too little weak in high action scenes

This point is also known and was already discussed on the forum. CQ_VBR is not good for hig action scene BUT it is far better in VCD res than CQ for evry other scene (I am talking about MPEG1 as I never do MPEG2).

So the choice as to be done according to the "actioness" of the movie.

Encoder Master 01-31-2004 12:57 PM

Quote:

Encoder Master wrote:
And I don't know why but you can see that there are more blocks with CQ_VBR because this mode has too little weak in high action scenes

This point is also known and was already discussed on the forum. CQ_VBR is not good for hig action scene BUT it is far better in VCD res than CQ for evry other scene (I am talking about MPEG1 as I never do MPEG2).

So the choice as to be done according to the "actioness" of the movie.
I know that it was discuss. But did you see the pic's above?
They say another and there are more blocks at a resolution of 352x288 with CQ_VBR.

CQ vs. CQ_VBR

kwag 01-31-2004 01:09 PM

Quote:

Originally Posted by Encoder Master
I know that it was discuss. But did you see the pic's above?

I did see the pics. Please re-read my previous post, and maybe look at OUR PICS in this thread, which contain HOW the samples were done WITH data to prove the points.

-kwag

Dialhot 01-31-2004 03:40 PM

And I would add something : I do not use CQ_VBR for VCD resolution because someone (even if he was kwag) told me to do like this . I use it because I tested it and compared to CQ. And I trust the one and only tool I ever use : my eyes.

Do not follow foreign advices, test it by yourself and take the one you prefer.

I use MPEG1 where others prefer MPEG2.
I do not use the MA script when others say it rocks.
I never encode the audio in dual chanel mode.
And I use tmpgenc for muxing.

You aren't a number, you are a free man :-).

Encoder Master 01-31-2004 03:56 PM

Quote:

Do not follow foreign advices, test it by yourself and take the one you prefer.
What do you think I've made with this screens and you have to admit that the CQ pic's are sharper and less of blocks then CQ_VBR.


Quote:

You aren't a number, you are a free man .
I know! :lol: :D :wink:

Dialhot 01-31-2004 04:02 PM

Quote:

Originally Posted by Encoder Master
What do you think I've made with this screens and you have to admit that the CQ pic's are sharper and less of blocks then CQ_VBR

I didn't notice these snapshots were yours.

So we are still at the point we were in my first post : the choice must be done according to what is in the movie.

And I agree with you that in the present case, CQ is better than CQ_VBR.

incredible 01-31-2004 08:51 PM

Well CQ or CQ_VBR......

in these samples above I see a total horizontal distortion/frequency cutting! Thats the one which would make me think about it, the CQ or CQ_VBR is not the problem in these pics.
It seems like a very overdone cutting using DCTFilter or the right colums of the DCT matrix.


Inc.

vhelp 01-31-2004 10:59 PM

pfew.. another long thread.

Listen, I remember following this very long thread (when it was short, way
back when SansGrip was adding his research knowledge etc to it)
and even then, it was considered long. Anways..

I remember following it while at work (every day) and it was fun and very
interesting indeed. This was the kind of thread/topic etc that I always looked
forward to while at work. Anyways..

I think what was kwag was saying is that you need to first read through the whole
thread (not just the tail end) because you miss so many key points, of which
led many of those that did the painstaking research (and testers) a great
deal of time and effert to conclude to. And, many of those key points were at the
beginning and then some. There are many key factors that led one here, to there
and so on and so forth.

So, w/ the above in mind, all those sample pics that you see (afer reading) should
be followed (to the letter) those settings used in TMPG (that includes the proper
bitrate settings, and those w/in the scope of the CQ vs. CQ_VBR analysis) and the
various Filters that were used during the testing (and debating) plus the various
.AVS scripts that were used, and the source type (Resident Evel, for instance)
(yes, like I said, I read it) and some ofthe tools used to compare the pics as
well as the encodes etc :P

.. .. .. getting some coffee .. .. ..

-vhelp

vhelp 02-01-2004 02:48 AM

Sorry, I had technicle issues w/ my pc..

As I was saying..

I remember those that contributed, rendalunit, jorel, maudib, jellygoose, kwag
el_mero_zooter, black prince, GFR and others.. the list goes on.

Check page 8, for intance. And, notice the CQ vs. CQVBR pics.

Did you use the same source files as those in the test threads here ?
Did you use the same .AVS scripts; filters; settings; bitrates etc etc etc ?
Again, all within the same params as those in the thread, and matching the
same sources etc etc.

Course, TMPG has evolved since that time, two years ago. So, the CQ/CQVBR mode
may have improved. Which in actuallity, my cause your argument to become
null'n void :P

That's about it,
-vhelp


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