DVD-RB oversizes on DVB-S streams

[krbo]

input is DVD authored from DVB-S mpeg2 streams (over 6Gigs)

stream data:

PAL,704x576, interlaced, 1 mp2 audio @ 192kbps, CBR 5.3Mbps
(various series episodes each in it's own VTS, basic menu)

DVD-RB set for 3 pass with CCE

example 1:

DVD-RB suggests for 144minutes of video bitrate of 4168kbps
which produces DVD of 4.880kb , no other bitrate calculator suggests
more then 4050kbps


example 2:

176 minutes - DVD-RB calculates 3465kbps while 3250 is correct



can this be a problem with long GOPs so usual in DVB streams?

last test was with 0.86 free - no tricks in .ini (CCE 2.70.02)

[jdobbs]

No TargetSectors settings?

[jdobbs]

How formula are you using to calculate? A quick back-of-the-envelope calculation would be:

Example 1:

4,700,000 bytes * 8 (bits) = 37,600,000 bits
37,600,000 bits divided by 144 minutes = 261,111
261,111 / 60 (seconds) = 4,351
4,351 - 192 (audio) = 4,159.

Also remember that DVD-RB uses dynamic allocation, so there isn't just one bitrate. There is one bitrate for every segment.

I'll have to think about the impact of the long GOPs -- but my first reaction is that it shouldn't make a difference.

[krbo]

Originally posted by jdobbs
No TargetSectors settings?

no, never used it and never ever got oversized DVD

Usually I'm encoding episodes one at a time without RB
so I have complete DVD very soon as the last one is aired.

This time I also wanted to try new CCE and used RB to make proper
ECL.



here is complete ini:

[Options]
AudioDub=0
OneClick=0
ReduceOpt=0
CCE=3
Completed=9
Skin=Rockas Original
ConvertToYUY2=1
AVSFilter01=
AVSFilter02=
AVSFilter03=
AVSFilter04=
AVSFilter05=
AVSFilter06=
HalfD1=0000
Convert_16_9=0000
DisableInterlace=0000
SkinVersion=3
EncoderMinimized=1
[Paths]
CCENEW=C:\Program Files\Custom Technology\CCE SP Trial Version\cctspt.exe
MPEG2DEC=C:\dvdprogs\DVDRebuilder\DGDecode.dll
Source=C:\TT\CARNIVALE_DVD\VIDEO_TS\
Working=C:\IC8\CARNIVALE_BURN\
Output=C:\IC8\CARNIVALE_BURN\
[CCEOptions]
VBR_bias=25
Quality_prec=16
eclPasses=3
[Audio]
Selected=

[krbo]

Originally posted by jdobbs
How formula are you using to calculate? A quick back-of-the-envelope calculation would be:

Example 1:

4,700,000 bytes * 8 (bits) = 37,600,000 bits
37,600,000 bits divided by 144 minutes = 261,111
261,111 / 60 (seconds) = 4,351
4,351 - 192 (audio) = 4,159.

Also remember that DVD-RB uses dynamic allocation, so there isn't just one bitrate. There is one bitrate for every segment.

I'll have to think about the impact of the long GOPs -- but my first reaction is that it shouldn't make a difference.

yes, it's flawless calculus .

I simply use some java bitrate calc for a long time.It is more conservative on bitrate and leaves me with some 200Mb of disk space margin which I like.

But there is one more thing to check, report earlier is from my home PC so I'll check later after work where I'm making another test.

Dynamic cell is not in question here as input material is CBR.

[jdobbs]

Hmmm... dynamic allocation still plays because it reallocates based upon the original allocation and the output is VBR. This is an instance, however, when you wouldn't want to allocate based upon the source... I have to think about that one.