Cmyth playback issue

Hello i am hoping someone can point me in the right direction. i have had a problem with video playback since the August update. i use mythbuntu for OTA broadcasts so reception is always perfect and this is where the problems occurs. as if i playback a TV show that had a little bit of spotty reception play back speed will vary widely either in a slow motion or sped up.

Bump. i am not really sure where to start with an issue like this

Providing debug logs taken while demonstrating the problem would be a good start.