Quantcast Bitrates: CQ Above Watermark ? - digitalFAQ.com Forums [Archives]
  #1  
08-07-2003, 12:07 PM
Rambytes Rambytes is offline
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I've made my first KVCD WITH the optimal script...

I've got a CQ of 66.84, SVCD 480x480.

I want to know if the quality will be better if my movie, instead of 480x480, go in VCD format, but with higher CQ?

I want to check the prediction of my VCD with CQMatic, the same way I've made my SVCD, and i've only change the resolution, and I get this error after the second pass:

CQ ABOVE watermark. CQ set to 90.
Using CQ of 90
CQMatic complete!

What is that???
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Someday, 12:01 PM
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  #2  
08-07-2003, 12:41 PM
rendalunit rendalunit is offline
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That's not an error message It is telling you that it did the prediction and the cq was above 90 so a cq of 90 is recommended.

352x240 @ cq 90 or
480x480 @ cq 66.84
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  #3  
08-07-2003, 02:32 PM
Rambytes Rambytes is offline
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But normal too that i've setup my MAX bitrate at 2500? A CQ of 90, for a 1h30 movie, at 352x240, i'm septic.....
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  #4  
08-07-2003, 02:35 PM
Krassi Krassi is offline
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Can you post your complete CQMatic-log
Please make sure that you have cleared source range in your project file.
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  #5  
08-07-2003, 02:36 PM
Rambytes Rambytes is offline
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How can I copy-paste the log???
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  #6  
08-07-2003, 02:37 PM
Krassi Krassi is offline
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Quote:
Originally Posted by Rambytes
How can I copy-paste the log???
Double-click on the log window
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  #7  
08-07-2003, 02:55 PM
Rambytes Rambytes is offline
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Yes my source range is set to "default" and UNCHECK the box after.

This is my log:

Quote:
http://www.kvcd.net
CQMatic Version 1.1.02
Copyright Softronex Corporation, 2003.
All rights reserved.
Time: 15:38:28 Date: 08/07/2003
Ready!
Project: D:\nmaries\nmaries.tpr

Creating: CQMatic.tpr

D:\nmaries\nmaries.m1v
Execute.
Movie Time: 95
Average Bitrate: 1028
Prediction Only mode
Executing Prediction Phase...
Process started at 15:39:10
On 08/07/2003
CQ set for prediction
Setting up initial sampling.
Using CQ of 60.00
Prediction cycle #1
Encoder started...
Process time: 7.68 minutes.
Encoder end.
File size difference = 2.484801
Low fence: 60.000000
High fence: 90.000000
Last CQ = 60.00
Current CQ = 90.00
CQ difference = 30.000000
Using CQ of 90.00
Prediction cycle #2
Encoder started...
Process time: 8.17 minutes.
Encoder end.
File size difference = 1.114397
Low fence: 90.000000
High fence: 90.000000
CQ ABOVE watermark. CQ set to 90.0
Using CQ of 90.00
CQMatic complete!
Total minutes of process: 15.87
Process ended at 15:55:02
On 08/07/2003
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  #8  
08-07-2003, 03:03 PM
Krassi Krassi is offline
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Can't see any error on first sight. You could try again with a higher resolution and see what CQ comes out.
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  #9  
08-07-2003, 04:26 PM
kwag kwag is offline
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Quote:
Originally Posted by Rambytes
But normal too that i've setup my MAX bitrate at 2500? A CQ of 90, for a 1h30 movie, at 352x240, i'm septic.....
At 352x240, if the encoder doesn't require too much high bitrate, that's the reason it sets the CQ to 90. Specially if it's only a 90 minute movie.

-kwag
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  #10  
08-07-2003, 04:29 PM
Rambytes Rambytes is offline
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Right now, i'm encoding at 352x240 with CQ85, 45min left

But what will be better?

480x480 @ CQ66
or
352x240 @ CQ85

???

In other word, higher resolution with lower bitrate, or lower resolution with higher bitrate?
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  #11  
08-07-2003, 04:31 PM
Krassi Krassi is offline
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Quote:
Originally Posted by Rambytes
Right now, i'm encoding at 352x240 with CQ85, 45min left

But what will be better?

480x480 @ CQ66
or
352x240 @ CQ85

???
Thats hard to tell. I think its source related. You could create 2 samples with the two resolutions and compare them by yourself.
I would take the bigger one
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  #12  
08-07-2003, 04:36 PM
jorel jorel is offline
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only my opinion Rambytes...
i always got better results with more resolutions.
my personal choice is 480x480 @ CQ66!
but nothing is better than little samples encoded
with each resolution to compare....like the hints from Krassi!
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  #13  
08-07-2003, 04:59 PM
Rambytes Rambytes is offline
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It'S only because, in my mind, 66% between 85%, the image is better quality with 85?

No?
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  #14  
08-07-2003, 05:18 PM
jorel jorel is offline
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maybe,...

is hard to choose without see the result.
resolution and CQ parameters are importants.

encode from the same source one little sample
with 480x480@CQ66 and another 352x240@CQ85.
your eyes will choose the best result.

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  #15  
08-07-2003, 05:54 PM
kwag kwag is offline
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Quote:
Originally Posted by Rambytes
It'S only because, in my mind, 66% between 85%, the image is better quality with 85?

No?
No. Specially that at 352x240 you only have half the lines
240 vs. 480.
Unless it's a long movie, or very high action, and the bitrate/pixel ratio is below good visible quality at 480x480, then 352x240 will look better (less blocky that is) but not sharper than 480x480.

-kwag
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  #16  
08-07-2003, 10:14 PM
jorel jorel is offline
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ha,
now Kwag came with clear explanations,
than don't have any doubts Rambytes.

follow the developer!
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