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15 Apr 2024 20:54:07 EDT (-0400)
  CMPEG question... (Message 1 to 5 of 5)  
From: Dearmad
Subject: CMPEG question...
Date: 3 Jan 2001 20:11:40
Message: <3A53CF05.DF555122@teleport.com>
When you guys are encoding, what sort of options are you using.  I've
been messing around with it and am getting great compression but a fuzzy
picture... I would like to increas the sharpness at the expense of
filesize...  

Also, do you render to 540x480 and shring your TGA's or render with
aliasing (or not) direct to 320x240

I'm just using the ipb.ctl file and -f2 for 24fps.

Any help on making the MPG look sharper out there?


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From: Dearmad
Subject: Re: CMPEG question...
Date: 3 Jan 2001 20:13:42
Message: <3A53CF80.93873EA8@teleport.com>
I meant 640x480 not 540.  Anyway, anyone with some help?


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From: John VanSickle
Subject: Re: CMPEG question...
Date: 4 Jan 2001 02:04:23
Message: <3A543545.1E5165E9@erols.com>
> I meant 640x480 not 540.  Anyway, anyone with some help?

I render at 320x240 (or whatever my final animation size will be).

I also render for 24 frames per second (-f2).

The d and m options I usually leave at -d0 and -m0 (the defaults),
especially for test renders.  For my current entry I used -d1 and -m1,
which vastly increased the time it took to compose the MPG, but
reduced the file size by 10%.

For the compression specs, I usually use the ipb.ctl file, although
I have tweaked it slightly.  The forward and backward vectors for P
and B frames are set to one in the original; I set them to two or
three.  The default also has quality settings of 4 for the I and P
frames, and 8 for the B frames; I usally pare this down to 3 and 6,
for improved quality.

CMPEG's algorithm could stand a lot of improvement, and as it's
written to run on a 286, updating it to use 486 instructions would
probably yield a significant speed boost as well.

Regards,
John


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From: Anthony C  D'Agostino
Subject: Re: CMPEG question...
Date: 4 Jan 2001 17:33:15
Message: <3a54fa2b@news.povray.org>
If you use cmpeg, you have to change some numbers in the ipb.ctl file:
-----------
b 8 0 0 1 0
b 8 1 0 0 0
i 4
b 8 0 0 1 0
b 8 1 0 0 0
p 4 1 0
b 8 0 0 1 0
b 8 1 0 0 0
p 4 1 0
b 8 0 0 1 0
b 8 1 0 0 0
p 4 1 0
-----------

Just play with the numbers in the second column.  Setting them to 1 gives
high quality and big file size; setting them to 31 gives low quality and
small size.

You should also get http://www.tmpgenc.com

Hope this helps!

--
Anthony C. D'Agostino
BMRT, POV-Ray, and Blender Galleries
http://ourworld.compuserve.com/homepages/scorpius


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From: Dearmad
Subject: Re: CMPEG question...
Date: 4 Jan 2001 17:42:26
Message: <3A54FD8F.8C6095FD@teleport.com>
Thanks!


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