BD3D2MK3D: Convert 3D BDs or MKV to 3D SBS, TAB or FS MKV - Support thread

[r0lZ]

Well, BD3D2MK3D doesn't change the frame rate of the original BD3D. As far as I know, all 3DBD are encoded at 23.976 fps (More precisely, at 24/1.001 fps. Don't ask me why that crazy NTSC frame rate has been adopted when the frame rate of the cinema has always been 24 fps and all modern equipments are able to play exactly 24 fps. It's a stupid american decision imposed to the whole world! Anyway, the fact is that we must live with 23.976 fps.) Of course, in frame sequential frame packing mode, there is twice the number of frames but when distributed to the two eyes, the frame rate is still 23.976.

Unfortunately, there is no support to change the frame rate in BD3D2MK3D. However, it is easy to modify the frame rate of the video stream by editing the text files produced by BD3D2MK3D before launching the encoding. The problem will be that the audio track will not be in sync any more. You will have te re-encode tha audio to adapt its frame rate. You can do that with eac3to (distributed with BD3D2MK3D, in its toolset folder) but wou will have to write the command in the Windows command prompt yourself. See here for more info. You will also have to change the file name in a text file.

In summary, you can select the Full-TAB mode in BD3D2MK3D, then edit __ENCODE_3D.cmd to change the --fps 24000/1001 to - - fps 24
At this point, you can launch the encoding. During the encoding, you should launch the eac3to commands to convert the audio strean(s), with something like this :

"path\to\BD3D2MK3D\toolset\eac3to.exe" "path\to\projects\movie\00001\InputAudio.ac3" "path\to\projects\movie\00001\OutputAudio.ac3" -changeTo24.000 -progressnumbers

Then, edit __MUX_3D_OPTIONS.json to change the frame rate below "--default-duration", from "0:24000/1001p", to "0:24p",
In the same file, change the file name of all audio track(s) at the end of each sections under // ### Audio stream(s)
If the muxing operation took place before you have finished everything, just relaunch the __MUX_3D.cmd file.

I have not explained what to do if you need to include subtitle streams in the final MKV. If it's your case, let me know...

Also, I don't know why the specs of your projector doesn't show SBS at 24fps. If it can play TAB at that frame rate, why not SBS? And the labels of the first formats, "(Frame Packing)", do not make sense. Frame packing is the generic name of all methods used to pack the two video streams in a single file, including SBS and TAB. I suppose they mean Frame Sequential. Anyway, a hardware claiming to support 3D video but unable to play the only official frame rate of the 3DBD format is certainly a bizarre hardware. But unfortunately, it's the case of many projectors. BTW, can I know if you live in NTSC or PAL land?

Sorry, I can' t help much more.

[r0lZ]

I forgot to explain that it is theoretically possible to avoid the audio re-encoding by just editing the mux options json file. But the result may not be perfect. I can explain how to do it if you want to try. That will be much easier and quicker. (The conversion of the subtitles to 24fps use the same method).