[mythtv-users] Strange time counter issue with recent NBC OTA recordings

Jim Stichnoth stichnot at gmail.com
Fri Nov 15 02:39:00 UTC 2013


On Thu, Nov 14, 2013 at 4:13 PM, Gabe Rubin <gaberubin at gmail.com> wrote:

> Does this mean recordings affected by this in versions < .27 will be fixed
> once upgraded to .27 or that seek tables need to be rebuilt?
>

Seektables will need to be rebuilt as needed, using "mythcommflag
--rebuild".  Pre-0.27 seektables map frame numbers to file offsets for
keyframes to enable relatively accurate seeking to a specific frame number,
but do nothing to help with accurate position and duration information, nor
to help map timecodes to frame numbers for accurate time-based seeking.
 0.27 adds a mapping from keyframe frame numbers to timecodes (using linear
interpolation for non-keyframes), which is used for accurate seeking and
position/duration display.

One caveat is that seeking/position/duration aren't yet working properly
for audio-only recordings, since there are essentially no video frames to
sync to.

Jim
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