Please recommend BD3D2MK3D settings for maximum or lossless quality

Crash! · 6th March 2025, 11:15

Greetings,

I would like to know which settings to use to retain as close to the original quality of the source 3D Bluray as possible when converting with BD3D2MK3D.

I converted a film using the default settings, but full rather than half side by side, and the file size was still only 1/7 the original file size, so I expect this means it is lossy. I would like the result to be as close to lossless as possible.

Any help would be greatly appreciated,

Thanks

r0lZ · 10th March 2025, 12:49

You should always use the CRF mode. To retain the best quality, use a low CRF value. 0 is lossless, but the file size will be huge, even more than the original file size of the two M2TS files of the BD.

Note also that the original file size is systematically too high. It's certainly for commercial reasons. A BD can hold huge files and therefore the buyer expects a file around 45 GB, but it's totally unnecessary. IMO, a 10GB movie correctly encoded with a good encoder like X264 cannot be distinguished from the original. Trust your eyes, and not the file size.

Crash! · 14th March 2025, 12:47

If I am to trust my eyes, the default settings appear blurry to me, and a full side by side conversion from 42gb to 7gb would seem to have to be lossy but I don't know.

I settled at a CRF of about 14, which resulted in a more similar converted file size which is hopefully more faithful.

Thanks

tebasuna51 · 14th March 2025, 18:16

The default crf for x264 in BD3D2MK3D (also in MeGUI) is 23, the help of x264.exe show the default to 28.
I use crf 20 most the times, and sometimes to 18 for high quality.
Some exigent people go until 16 but less than this is considered like useless.

6th March 2025, 11:15	#1 \| Link
Crash! Registered User Join Date: May 2011 Posts: 2	Please recommend BD3D2MK3D settings for maximum or lossless quality Greetings, I would like to know which settings to use to retain as close to the original quality of the source 3D Bluray as possible when converting with BD3D2MK3D. I converted a film using the default settings, but full rather than half side by side, and the file size was still only 1/7 the original file size, so I expect this means it is lossy. I would like the result to be as close to lossless as possible. Any help would be greatly appreciated, Thanks

10th March 2025, 12:49	#2 \| Link
r0lZ PgcEdit daemon Join Date: Jul 2003 Posts: 7,498	You should always use the CRF mode. To retain the best quality, use a low CRF value. 0 is lossless, but the file size will be huge, even more than the original file size of the two M2TS files of the BD. Note also that the original file size is systematically too high. It's certainly for commercial reasons. A BD can hold huge files and therefore the buyer expects a file around 45 GB, but it's totally unnecessary. IMO, a 10GB movie correctly encoded with a good encoder like X264 cannot be distinguished from the original. Trust your eyes, and not the file size. __________________ r0lZ PgcEdit homepage (hosted by VideoHelp) BD3D2MK3D A tool to convert 3D blu-rays to SBS, T&B or FS MKV

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14th March 2025, 12:47	#3 \| Link
Crash! Registered User Join Date: May 2011 Posts: 2	If I am to trust my eyes, the default settings appear blurry to me, and a full side by side conversion from 42gb to 7gb would seem to have to be lossy but I don't know. I settled at a CRF of about 14, which resulted in a more similar converted file size which is hopefully more faithful. Thanks

14th March 2025, 18:16	#4 \| Link
tebasuna51 Moderator Join Date: Feb 2005 Location: Spain Posts: 7,206	The default crf for x264 in BD3D2MK3D (also in MeGUI) is 23, the help of x264.exe show the default to 28. I use crf 20 most the times, and sometimes to 18 for high quality. Some exigent people go until 16 but less than this is considered like useless.