[FFmpeg-user] (Solved-ish: NMP) Choppy (hanging) video when writing C920 h264 to a file (no issues streaming)

[Peter Rabbitson]

Followup for the sake of search engines: none of this has nothing to do 
with ffmpeg, nor with the -r setting, nor with the size of the picture, 
nor with the amount of light in the room.

Kernel 3.2 (wheezy) - everything is fine, video smooth as silk
Kernel 3.16 (jessie) - the observed "stutter" is present

Time for bisecting... FML

Many thanks to Georgi and Carl for their help affirming I haven't lost 
my sanity ;)