After transcoding an MP4 file into an M2V one, the audio and video become slightly shorter in length and desynch with subtitles: (Screenshot of encore and VLC media player)
The subtitles themselves are not the problem: (Screenshot of "subtitle edit")
If i choose "Keep existing settings" when importing a video file into premiere pro, the video wont desynch, but it'll be zoomed, otherwise it wont zoom but it'll desynch:
Im sure the problem is pretty simple to solve, though im too amateurish to know what to do exactly 
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1 Correct answer
After a lot of research about sequence settings, Ive come up with the following sequence and exportation settings:
These have completely solved the issue on 5 different films 
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Sorry for taking so long to reply, I was busy upgrading my whole stuff among other things. So! Here's a total update of the situation.
Premiere Pro CC 2018 now lets me set a timebase and display format of 23.976fp at the same time:
Only 24fp timebase and display format shows the movie with the correct length:
I decided to make 2 transcodifications, 1 with 23.976fp and the other with 24fp, bitrate viewer shows only a minimal change in the length of the M2V videos:
However, once rendered in any video player, the length changes drastically:
So the desynch is now even worse:
Im going to make another transcodification using 15fp just to see what happens.
"This does not affect Encore as a CS6 product doing the encoding for stereo only dolby.
I figured that much so i kept encore installed, also, encore shows the same video length as Splayer, VLC and Windows media players.
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