[mythtv-users] Announcement: Looking for Alpha testers for a generic Lossless cut solution

[Doug Vaughan]

Dan,
     I just checked the showinfo filter out and you are right I cannot 
find a reliable correlation between what ffmpeg indicates as a keyframe 
and what MythTV put in the seektable when recording. Ffmpeg indicates 
there are significantly more keyframes than MythTV identified. The 
ffmpeg keyframe numbers are not close to what is in the seektable. I 
tried to see if there was some sort of base shift number that could be 
used in a formula but nothing was apparent.

     For my HD-PVR 720p recordings the keyframes are almost always 128 
frames apart starting after the first non-zero keyframe.  I noticed that 
ffmpeg shows a consistent 32 frames apart. Even though 32 is a multiple 
of 128 it still looks too inconsistent to extrapolate. I think the 32 
frame number is the same as what mythcommflag --rebuild inserted for the 
same HD-PVR 720p recordings. I would have to check but am too busy right 
now.

Interesting but does not help.

Doug