www.makemkv.com

This is what I found during the movie AVATAR (Italian)
I think the problem is due to some bugs, this problem shows some frames.


PROCEDURE MakeMKV

These are frames of reference

Frame 2:06:53 (it is not the subforced)




Frame at 02:30:37 (subforced appears on the next frame of 02:30:51)




2:30:51 frame (it is not the subforced for this frame)




PROCEDURE MKVToolnix
With this procedure, the subtitles are correct


Frame 02:06:53




Frame 02:30:51

Do you run MKVToolnix on MKV file produced by MakeMKV, or on decrypted M2TS file? Is the subtitle before or after correct frame?

MakeMKV was carried out by Blu-ray already decrypted (so full) to the HDD, the same procedure was performed with MKVToolnix.
Are two independent procedures.

The subtitle, in this example, appears before the correct frame.
In other situations also appears later.