[mythtv] rolling up my sleeves: a few questions about commflagging
Brian J. Murrell
brian at interlinx.bc.ca
Mon Jan 27 14:50:16 UTC 2014
On Mon, 2014-01-27 at 13:01 +0000, John Pilkington wrote:
> Yes, it's fetching it from the DB, but AIUI that was changed quite
> recently with the intention of solving the long-standing problem of
> variable frame-rates.
Ahhh. I see. The time between keyframes is available which means that
a frame rate, at least from one keyframe to another is calculatable. In
practice, at least from a couple of recordings I have looked at here,
keyframes are approx. every 15. Perhaps that is plenty enough to get an
accurate enough calculation of commercial lengths with changing
I will have to look into where mythutil --getmarkup is getting that data
from and see if it's available during commflagging, which is typically
happening live, during recording (to take advantage of page caching to
avoid re-reading the frames from disk). Certainly it could be a
post-recording-complete process if necessary but that doubles the disk
I/O and adds latency to the commercial flagging data.
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