Quantcast Bitrates: Filesize Way Too Big? - digitalFAQ.com Forums [Archives]
  #1  
09-11-2003, 11:38 AM
Jellygoose Jellygoose is offline
Free Member
 
Join Date: Jun 2002
Location: Germany
Posts: 1,288
Thanks: 0
Thanked 0 Times in 0 Posts
Ok I tried CQMatic and Calcumatic today for the first time ...
Movie was PAL and Fullscreen, and 114 minutes long. Unfortunately the file came out 50 mb too big...
Now I didn't use that Average Bitrate x .57 as Minimum bitrate (does that make a difference for prediction ?? ) other than that I cannot think of anything why it DID not work...
__________________
j3llyG0053
Reply With Quote
Someday, 12:01 PM
admin's Avatar
Site Staff / Ad Manager
 
Join Date: Dec 2002
Posts: 42
Thanks: ∞
Thanked 42 Times in 42 Posts
  #2  
09-11-2003, 12:02 PM
Dialhot Dialhot is offline
Free Member
 
Join Date: May 2003
Posts: 10,463
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Jellygoose
(does that make a difference for prediction ?? )
Yes, it does !
Reply With Quote
  #3  
09-11-2003, 02:35 PM
Jellygoose Jellygoose is offline
Free Member
 
Join Date: Jun 2002
Location: Germany
Posts: 1,288
Thanks: 0
Thanked 0 Times in 0 Posts
Ok so you're actually supposed to :

1. Open your source in Calcumatic and let it calculate your Average Bitrate x .57.

2. Put that value as Minimum Bitrate in TMPGEnc and save it as .tpr Text Project.

3. Open that project in CQMatic

Is that what you have to do? Do I have to use such a high Min. Bitrate to be able to work with the software?
__________________
j3llyG0053
Reply With Quote
  #4  
09-11-2003, 02:40 PM
kwag kwag is offline
Free Member
 
Join Date: Apr 2002
Location: Puerto Rico, USA
Posts: 13,537
Thanks: 0
Thanked 0 Times in 0 Posts
Hi Jellygoose,

The 0.57 * Average is to help with TMPEGs (un)linearity while predicting.
All your steps are correct.

-kwag
Reply With Quote
  #5  
09-11-2003, 03:13 PM
Jellygoose Jellygoose is offline
Free Member
 
Join Date: Jun 2002
Location: Germany
Posts: 1,288
Thanks: 0
Thanked 0 Times in 0 Posts
Alright I'll give it another try
__________________
j3llyG0053
Reply With Quote
  #6  
09-11-2003, 07:32 PM
bigggt bigggt is offline
Free Member
 
Join Date: Mar 2003
Location: IamCanadian
Posts: 848
Thanks: 0
Thanked 0 Times in 0 Posts
Hi Jellygoose just to put my 2 cents in here i did a movie about a week ago and it was 50 mbs too big and then i adjust the min bitrate to *57 of the average and it was almost dead on.

The movie was ntsc but i think the *57 is a lot more accurate.
Reply With Quote
  #7  
09-12-2003, 03:30 AM
Jellygoose Jellygoose is offline
Free Member
 
Join Date: Jun 2002
Location: Germany
Posts: 1,288
Thanks: 0
Thanked 0 Times in 0 Posts
Well the only problem I see is that you loose a lot of space with such a high min. bitrate (in my case 610kb).
What about that option in TMPGEnc "Enable padding not to be lower than minimum bitrate" ? You leave it checked?
__________________
j3llyG0053
Reply With Quote
  #8  
09-12-2003, 06:38 AM
jorel jorel is offline
Invalid Email / Banned / Spammer
 
Join Date: Aug 2002
Location: Brasil - MG - third stone from the sun
Posts: 5,570
Thanks: 0
Thanked 0 Times in 0 Posts
yes Jell, use it checked!

you are right about "loose a lot of space with such a high min."
i wrote it a month ago somewhere here...(nobody listen to me).

but i use min300 and max2500 for skvcd and
don't use the min bitrate to *57 of the average!
the final size is small!
Reply With Quote
  #9  
09-12-2003, 07:19 AM
Dialhot Dialhot is offline
Free Member
 
Join Date: May 2003
Posts: 10,463
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by jorel
you are right about "loose a lot of space with such a high min." i wrote it a month ago somewhere here...(nobody listen to me).
Lol. For your information I never stop to use 64-2300 as I always did even if I recommand to others to follow Kwag advices
Reply With Quote
  #10  
09-12-2003, 07:45 AM
Wolfi Wolfi is offline
Free Member
 
Join Date: Oct 2002
Location: Sweden
Posts: 489
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via AIM to Wolfi Send a message via MSN to Wolfi Send a message via Yahoo to Wolfi
Some of you tells that you should use Average Bitrate x .57 and then put that value as min. bitrate in TMPGEnc (my case 672.7 as min. bitrate) and someone is saying that you should use min. bitrate 300. What is right

//Wolfi
Reply With Quote
  #11  
09-12-2003, 07:54 AM
Dialhot Dialhot is offline
Free Member
 
Join Date: May 2003
Posts: 10,463
Thanks: 0
Thanked 0 Times in 0 Posts
The only thing right is that if you want to benefit of all the accuracy of CQMatic, you have to use the *.57 value.

If, as Jorel or I do, you use other values, don't blame CQMatic if your file is far to the target size.
Reply With Quote
  #12  
09-12-2003, 07:58 AM
jorel jorel is offline
Invalid Email / Banned / Spammer
 
Join Date: Aug 2002
Location: Brasil - MG - third stone from the sun
Posts: 5,570
Thanks: 0
Thanked 0 Times in 0 Posts
hey Wolfi,
i don't know what is right but nobody is wrong!
got it?


see how i do for skvcd (480x480):
min 300, max 2500,
then in CalcuMatic i adjust the audio to 96 bitrate(only for prediction),
got the average bitrate(not the 0.57)!
use CQMatic1.2.00 and put the bitrate to got the prediction!
...encode.....
in the end,
you will encode the audio as 128(maybe more)
with the video for good final size!
Reply With Quote
  #13  
09-12-2003, 08:34 AM
Wolfi Wolfi is offline
Free Member
 
Join Date: Oct 2002
Location: Sweden
Posts: 489
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via AIM to Wolfi Send a message via MSN to Wolfi Send a message via Yahoo to Wolfi
Okoj NOT the 0.57! I get now I'll give it a try now

//Wolfi
Reply With Quote
Reply




Similar Threads
Thread Thread Starter Forum Replies Last Post
Bitrates: CQMatic Filesize Problem Brenth Video Encoding and Conversion 2 08-19-2008 08:39 AM
Filesize prediction - always end up with a CQ of 90? shibumi Video Encoding and Conversion 17 11-21-2003 02:21 PM
How To Predict Filesize for DVD Standard GOP? Jellygoose Avisynth Scripting 1 01-09-2003 04:22 PM
Avisynth: predicting the filesize miksmith Avisynth Scripting 16 12-05-2002 08:08 PM
KVCD: CQ_VBR value and filesize? Boulder Video Encoding and Conversion 1 10-05-2002 06:48 AM

Thread Tools



 
All times are GMT -5. The time now is 06:48 AM  —  vBulletin © Jelsoft Enterprises Ltd