Quantcast Bitrates: How to use CQmatic? - digitalFAQ.com Forums [Archives]
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08-29-2003, 06:30 AM
mistermickster mistermickster is offline
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Hi Kwag, (and all experienced users),

I am keen to learn more about how to use CQMatic to get the results I need from my encodes.

I want to get as near perfect encodes as possible for my backups, not just watchable, otherwise I may as well watch the DVD and not bother backing it up.

I have decided on encoding all my projects to MPEG2 because of the better quality it can produce, (unless anyone can convince me otherwise). With that in mind, I have also decided on the following Movie Length:Number of 80 min CD's ratio
  • Cartoons (usually 75-90mins) - 1 CD
    Movies < 60 Mins - 1 CD
    Movies < 120 Mins - 2 CD's
    Movies > 120 Mins - 3 CD's

I intend to use the MA script with the KVCDx3-MPEG-2-PAL template for these, (other suggestions accepted of course ).

Ok, for example, I wish to encode Spiderman (117 mins ish) with 1 audio track (bitrate 192), which would go on 2 CD's. I enter this into CalcuMatic and get Average = 1675.1 and 0.57*Average = 954.8. I enter a Min of 954.8 and Max of 2000 into TMPGEnc and save my project.

Having done that, I would want to test a small sample, to see if it is of an acceptable quality before doing a full encode, and to check that my DVD player will play it

Does everything seem Ok so far

Right, now we come to CQMatic.

I enter my Average bitrate and Movie length, locate my Project and load it, then what Does the Prediction Only mode produce any output that I can watch on my player

Sorry for the long post for a short question.

Thanks in advance.
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  #2  
08-29-2003, 06:47 AM
Dialhot Dialhot is offline
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Quote:
Originally Posted by mistermickster
I have decided on encoding all my projects to MPEG2 because of the better quality it can produce, (unless anyone can convince me otherwise)
The only ones that can convince you are your eyes ! Do a sample in MPEG1 and in MPEG2 with the same CQ (preferabily not too hight, because at CQ90 the quality diff will be difficult to see ).
I did it weeks ago and I never returned back to MPEG2

Quote:
Ok, for example, I wish to encode Spiderman (117 mins ish) with 1 audio track (bitrate 192), which would go on 2 CD's. I enter this into CalcuMatic and get Average = 1675.1 and 0.57*Average = 954.8. I enter a Min of 954.8 and Max of 2000 into TMPGEnc and save my project.

Having done that, I would want to test a small sample, to see if it is of an acceptable quality before doing a full encode, and to check that my DVD player will play it

Does everything seem Ok so far
Yes

Quote:
I enter my Average bitrate and Movie length, locate my Project and load it, then what Does the Prediction Only mode produce any output that I can watch on my player
Yes. At the end of the prediction you will find a file with "m1v.sample" as ext (or perhaps m2v.sample as you do mpeg2). That is the last sample encoded by CQMatic and you can convert it to true mpeg file with tmpgenc : go to mpeg tools / simple mutiplex / select the sample as video source and nothing as audio source and mexe it as MPEG1 VCD non standard or MPEG2 SVCD (not sure that works but I thing I already did this once).
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