I just upgraded my Nexus 7 to 4.4.3 last night and it seemed to introduce a problem with video streaming. After approximately 15 minutes of playing SD video, the video stream begins to stutter while the audio continues to play just fine.
I also use Plex on my Android (mostly for the sync feature, a must-have for me as my upload speed is awful) and I noticed that it has a similar issue where it will stutter after about 8 minutes of playback.
I can provide logs if you think you will need them.
PS How is the player rewrite going? I am wondering when the next update will be.