easySUP & tsMuxer framerate question

[Ennio]

hi everybody

I converted an srt file with easySUP and output the sup file with 24.000 fps. When I load the file in tsMuxer it tells me the file is 23,976 fps. When I mux it with the 24 fps video and the audiotrack the subtitle gets out of sync gradually, I checked at the end.

Now, I doublechecked that with fps set to 24 in easySUP the subtitles stay in sync. Am I doing something wrong or is this a flaw in easySUP or tsMuxer?

Thanks in advance

Ennio

Edit: When I export the sub with SubtitleEdit as a BD sup file with 24 fps set, tsMuxer correctly states the fps as 24. After muxing though the subs also get out of sync gradually. I really don't know what's happening here.
Anybody?

Cheers