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Old 17th November 2022, 13:48   #1  |  Link
DanDare1983
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Main Movie goes over the 25gb target?

I'm using BDrebuilder to simply compress my movies to main movie (25gb) and have noticed some movies go over this target. I'm using ffdshow as frame server and using crf for quality on the high quality (default) setting. Does anybody have any previous experience in regards to this problem and how to rectify the problem. Thankyou
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Old 18th November 2022, 11:53   #2  |  Link
gonca
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Use 2 pass for a fixed size or reduce your target size when it overshoots while using crf.
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Old 18th November 2022, 22:37   #3  |  Link
jdobbs
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CRF uses an alogorithm to attempt to predict output size, it is pretty accurate, but can sometimes be wrong. If it oversizes, look at the predicted value, and set a fixed CRF that is slightly larger.
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Last edited by jdobbs; 18th November 2022 at 22:42.
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Old 19th November 2022, 12:41   #4  |  Link
DanDare1983
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Quote:
Originally Posted by jdobbs View Post
CRF uses an alogorithm to attempt to predict output size, it is pretty accurate, but can sometimes be wrong. If it oversizes, look at the predicted value, and set a fixed CRF that is slightly larger.
Thankyou for getting back to me. The movie in question was very grainy and them type of movies rarely encode well and can give huge file sizes. I did however try two pass and that got me a file around 21.5gb which was perfect as I don't like maximising the space on the Blu-ray Disc. In regards to the CRF can you manually set that? I'm just using the default high quality atm, could you tell me the crf for high quality. I assume its around the 21/22 mark.
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Old 19th November 2022, 13:22   #5  |  Link
gonca
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From the HIDDENOPTS file
Quote:
FIXED_CRF=n n = 1..50 - force CRF encoding to use this CRF value (output size control disappears)
This is entered in your config file after [Options]

Last edited by gonca; 19th November 2022 at 13:25.
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Old 19th November 2022, 14:48   #6  |  Link
DanDare1983
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Quote:
Originally Posted by gonca View Post
From the HIDDENOPTS file

This is entered in your config file after [Options]
Thanyou very much for your help, I'll try this when i get home.
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