Quantcast KVCD: Working Way to get a Decent CQ Value? - digitalFAQ.com Forums [Archives]
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06-22-2004, 03:15 PM
SheffUK26 SheffUK26 is offline
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Ive been using the templates for KVCD now for 2 days and I am very impressed with the IDEA of getting so much video onto one CD.

However I have failed to get anything close to a video file able to fit on a cd. CQmatic and Calcumatic seem great tools if they work. I have managed to get small video files compressed enough to fit 3 45min tv episodes onto 1 cd. However when it comes to encoding full films, the problems of finding the right CQ setting is somewhat very hard to find.

CQmatic when even used in x3 mode gives me 82 for a particular video and when trying it, my video was around 12mb per 1% of encoding which equates to well over 800mb. Ive let the encode run through and its around 1gb and i understand the difference in frame compression so the theory if simply multiplying as shown above is not accurate.

So i guess im praising the whole idea but nagging the concept of getting the finished product. Ive trauled the forums and to be honest theres a hell of a lot of stuff here rather than a final this is how its done kinda guide.
Is it possible to get a very close end result in some way? even if not with cqmatic?... It seems a waste of such a good idea if it cant be guarantted to work at least 90% of the time. Ive tried 3 videos and gone with CQmatics advice on CQ and each tiome on these full vids, the output has been way too large.

So at this point, if anyone has any advice on a "working" way to get a decent CQ value, please let me know.

Thanks
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  #2  
06-22-2004, 03:58 PM
Zyphon Zyphon is offline
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What video tool are you using for you encodes?

TMpg Encoder is usually used for Mpeg1 as it is the best (IMO) for KVCD.

However there are problems with versions 2.59 and later of TMpg Encoder have problems with predicting and you should try to find the free version of 2.58 of the encoder.

The more experienced seasoned guys should be able to explain more and go into more detail than me.

I hope this helps a little.
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06-22-2004, 04:41 PM
muhali3 muhali3 is offline
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SheffUK26: If you are encoding or multiplexing your film as MPEG-1 VideoCD or MPEG-2 SVCD standard that could be the problem. Because the encoder would output the final file size as if your video had a CBR of 1150(VCD) or 2250(SVCD). Encode or multiplex as MPEG-1 VideoCD(non-standard) or MPEG-2 Program (VBR).
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06-22-2004, 07:58 PM
SheffUK26 SheffUK26 is offline
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thanks for that guys..

Well, ive simply got a 700 avi file which ive shoved into tmpgenc. Ive used the normal kvcd pal template and saved as project. . Used the calc and cqmatic and got a result of say 80ish. I go back to tmpgenc and open the project, manually set CQ and change prohect to add audio. Ends up being 1gb. I think however ive found something out since i wrote it earlier. I was in work and the version i used i think (dont qoute me) was 2.59.xx? and im at home now and my version is 2.510.49.147. Strangely ive tried it here and its looking more like what i need.
I realise that I could take off the audio and multiplex after but it all takes time. I want a tool thats basically heres the file and click fit to CD button and click encode and thats it.. However nothing is that easy. Dont think i even wanna look at all these scripts ive seen around as they look quite complex and what i have at the moment gives good results, unless you can give me some tips that could steer me into something more exciting and beneficial.

Just checked and it was 2.59 @ work.. dont know what its problem is bloody thing!!


Ok, only other thing i wanna know is the resolution stuff.
I can see a number of templates at different resolutions. Does higher res meen better quality but hardser to get more stuff on a cd so in turn you have to lessen quality.. which wud mean whats point , so use normal res.. if that makes sense

And also, uk, PAL template, I was under the assumption that was all uk TVs could view so anything else would be distorted, wouldnt work etc, Am i wrong in saying that.

Cheers Lads/Lasses
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06-22-2004, 08:13 PM
Dialhot Dialhot is offline
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Quote:
Originally Posted by SheffUK26
I realise that I could take off the audio and multiplex after but it all takes time.
Encoding audio and video together with tmpgenc add 10% to the encoding time. Doing it by hand separately take the same time for a much better quality. Do your choice

Quote:
I want a tool thats basically heres the file and click fit to CD button and click encode and thats it..
That's not a problem.
Did you just CHECKED that when you added the video, the muxing mode was set to "VCD non compliant" or "SuperVideo CD" ? Your problem can come from that, as explained by muhali3. Just check that point before to save tour project (or to run the job)

Quote:
Just checked and it was 2.59 @ work.. dont know what its problem is bloody thing!!
2.59 as a bug that prevent it to mux in "non compliant" even if you chose it ! And as told just above, KVCD must be muxed in non compliant mode.

Quote:
Does higher res meen better quality but hardser to get more stuff on a cd so in turn you have to lessen quality.. which wud mean whats point , so use normal res.. if that makes sense
The higher is the resolution, the sharper is the result. And a sharpen image is more pleasant for the eye. But you are right : you must do a compromize between big resolution and low quality.

The idea is to start by the highest resolution (544*480 if your player handle it) and find the CQ with CQmatic. If the CQ is below 60 (or even 65 if you want real good quality), then go to the resolution just udner (480*480) and restart the process... and so on until ytou have a CQ that is above 65.

Quote:
And also, uk, PAL template, I was under the assumption that was all uk TVs could view so anything else would be distorted, wouldnt work etc, Am i wrong in saying that.
Not at all. In fact 90% of material sold in Europe can handle NTSC also. TV, DVD, VCR... (at least in playback mode, not in recording).
The opposite : most of what is sold in USA can't do other thing than NTSc


Cheers Lads/Lasses[/quote]
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06-23-2004, 04:47 AM
SheffUK26 SheffUK26 is offline
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ahh...
So if I say encode a 30 second clip in each resolution, burn it to cd, I can then see the results ...

Thanks for info on audio.. Ill try to rip off audio with virtualdubmod and put through besweet.

So all in all I think im ok now .
Ill try different resolutions to see the best results..

Thanks for all your help.

Oh and yes, tmpgenc was set to mpg - non standard.
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