So I recently upgraded from a RPI B running RaspBMC, to a RPI2 running OSMC, and now a lot of the avi(Xvid) playback is choppy, it wasnt choppy on my RPI B running RaspBMC.
Here is the exiftool output on one of the files.
exiftool S05E15\ -\ A\ Funeral\ Brings\ George.avi
ExifTool Version Number : 9.74
File Name : S05E15 - A Funeral Brings George.avi
Directory : .
File Size : 175 MB
File Modification Date/Time : 2015:08:12 18:36:51-04:00
File Access Date/Time : 2015:08:25 09:17:14-04:00
File Inode Change Date/Time : 2015:08:12 18:36:51-04:00
File Permissions : rw-r--r--
File Type : AVI
MIME Type : video/x-msvideo
Frame Rate : 23.976
Max Data Rate : 0 kB/s
Frame Count : 30871
Stream Count : 2
Stream Type : Video
Video Codec : xvid
Video Frame Rate : 23.976
Video Frame Count : 30871
Quality : 10000
Sample Size : Variable
Image Width : 624
Image Height : 352
Planes : 1
Bit Depth : 12
Compression : XVID
Image Length : 1317888
Pixels Per Meter X : 0
Pixels Per Meter Y : 0
Num Colors : Use BitDepth
Num Important Colors : All
Audio Codec :
Audio Sample Rate : 41.67
Audio Sample Count : 53648
Encoding : MP3
Num Channels : 2
Sample Rate : 48000
Avg Bytes Per Sec : 15266
Bits Per Sample : 0
Total Frame Count : 30871
Software : VirtualDub
Duration : 0:21:27
Image Size : 624x352