[smp1]

 I can confirm the buffering issue with .m2ts and .ts files. The issue occur during the playback over LAN (SMB). Local playback seem to be ok. The same videos play fine if remuxed to mkv.  

Is this a recent problem in these builds? Identifying the first build with the problem would be useful.      

I identified the build that introduced this issue - #0912 

 I created a trac ticket and this is a reply from FernetMenta:
"I don't think that those linked changes are directly related to the issue. The root cause is bad performing SMB due to incorrectly set chunk size. Unlike mkv ts files have no index and demuxer has to read a lot of data at the beginning. master branch is missing: ​https://github.com/FernetMenta/kodi-agile/commit/51fd52a7ca8134f4699fc0d6ebc48db40a081170#diff-6bcbc5e72cb6f869342ecae26c6a45ff"

So I built with the above change to SMBFile.h and the issue is gone.