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Old 22nd April 2010, 18:17   #1  |  Link
DoctorM
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Join Date: Sep 2005
Posts: 550
Question on how DVD-RB chooses max bitrate...

I know there has been a lot said on why the maximum bitrate in the REBUILDER.ECL appears to be low (but isn't).
I understand that it needs to leave space (120%) for when the disc is rebuilt.

That said, I AM noticing a problem.
I am currently rebuilding a DVD using CCE 2.70 OPV. The Q value is only 8, but I'm seeing visible new artifacts not present in the source.

The source DVD I'm working with at the moment has a LOT of audio tracks.
A DTS 6-ch (768kbps), two DD 6-ch (448 & 384kbps), and 2 DD 2-ch (both 192 kbps) for a whopping 1984kbps worth of audio alone.

The original discs's max bitrate, as a result, is around 7500.
It APPEARS that DVD Rebuilder is only taking 83% of the original DVD's max bitrate (about 6200kbps).

The problem is that that is awfully low... and I've stripped all but 1 audio track (the DTS).
As a result my max bitrate SHOULD take advantage of the bitrate savings and be original: original max bitrate + total audio bitrate - kept audio track bitrate OR (7500+1984-768)*83%=7234kbps (which is 8681kbps once the disc is rebuilt.

While in theory exceeding the original disc's maximum bitrate would be pointless, in practice we (usually) do not encode as efficiently as they do commercially.

Am I wrong? Bitrate distribution seems to have no effect on this either.

One more thing, that 120% number for the bitrate increase on rebuilding... doesn't that ONLY effect video that is 29.97 or hybrid? In theory then, if the source is 100% film it is taking a hit to the max bitrate as well.

Since DVDRB analyzes before encoding video in multiple pieces, the max bitrate could be set 120% higher for any and all pieces that are determined to be 100% film during analysis... couldn't it?
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