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View Full Version : B-Frames causing subtitle corruption?

Evil_Sigma
31st July 2003, 19:01
OK, I've been experience some problems using b-frames and subtitles (SSA). They seems to be corrupted on side-ways (left to right, right to left) panning and bottom-to-top pannings. It's really annoying and I would like to know if it's fixable, or at least reduce the possibilities of it occuring.

XViD Settings:
Motion Search Precision: 6 - Ultra high
Quant Type: h.263
VHQ Mode: 4 - wide search
Max i-frames interval: 240
min i-frame interval: 1
Chroma Motion enabled

max bframes: 2
quant ratio: 150%
Quant offset: 75
threshold: 40

Chroma Optimizer enabled
Trellis R-D Quant enabled.

Well, since a picture is worth a thousand words, then let me know you what I'm talking about. it will speak scores louder. :)

http://www26.brinkster.com/umby/otwins_cap_001.jpg
http://www26.brinkster.com/umby/otwins_cap_002.jpg
http://www26.brinkster.com/umby/otwins_cap_003.jpg
http://www26.brinkster.com/umby/otwins_cap_004.jpg
NOTE: These files are of Onegai Twins ep 2 & 3 by Aozora.

Any help would greatly be appeciated on this matter. Thank you,
Sigma
secretz
31st July 2003, 19:21
Trellis R-D Quant enabled.

Dont know much but could this do it?
Evil_Sigma
31st July 2003, 19:24
I did a series of tests a while ago, enabling/disabling various switches. No effect. It only goes away when I don't use B-frames.
Sigmatador
31st July 2003, 19:35
*i think* trellis can't do this, but b-frames can introduce a 1 frame-shift (this is why we need a trim(1,0) to use compare() )
divx with bframe doesn't have this problem, isn't really possible to fix that ?
Evil_Sigma
1st August 2003, 17:05
Originally posted by Sigmatador
*i think* trellis can't do this, but b-frames can introduce a 1 frame-shift (this is why we need a trim(1,0) to use compare() )
divx with bframe doesn't have this problem, isn't really possible to fix that ?

I'm sorry, but i'm a bit confused on how I would implement Trim(1,0) and compare in my avs script. Can you clearify a bit?
PowerMacG4
2nd August 2003, 07:18
He is talking about measuring PSNR with compare(), which you arn't.
Sirber
2nd August 2003, 14:22
The image “http://www26.brinkster.com/umby/otwins_cap_001.jpg” cannot be displayed, because it contains errors.

:D

From Mozilla 1.4
Evil_Sigma
3rd August 2003, 08:42
Originally posted by PowerMacG4
He is talking about measuring PSNR with compare(), which you arn't.

okay, i think that's a bit above me at this moment in time. So far, there is no way to fix it, am I correct?

Siggy.
Nic
3rd August 2003, 10:23
@Evil_Sigma: Have you tried decoding with a different decoder? How does ffdshow perform (both using libavcodec and xvid.dll)? etc.

-Nic
Evil_Sigma
8th August 2003, 13:09
Originally posted by Nic
@Evil_Sigma: Have you tried decoding with a different decoder? How does ffdshow perform (both using libavcodec and xvid.dll)? etc.

-Nic

No, I haven't. I'll try it out though. I'll post my comments about it. Thanks!
-
Sigma
Evil_Sigma
8th August 2003, 18:42
Yes, it works now!! Thank you, Nic! Apprently, ffdshow-20020617.exe is what I had installed, wasn't decoding it right. I installed the alpha version (ffdshow-20030523.exe) and it works fine! No errors anywhere.

Thanks again,
Sigma