[mythtv-commits] mythtv branch fixes/0.27 updated by jstichnoth. v0.27.3-112-g6788ea9

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The branch, fixes/0.27 has been updated on the
mythtv repository by gitolite user jstichnoth.
       via  6788ea9ab34b86a1b7f18a540f91d5c5514f4665 (commit)
      from  5c76f3356fe2178677019e0415151e64605411c4 (commit)

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- Log -----------------------------------------------------------------
commit 6788ea9ab34b86a1b7f18a540f91d5c5514f4665
Author:    Jim Stichnoth <jstichnoth at mythtv.org> at Sun, 13 Jul 2014 08:46:16 -0700
Committer: Jim Stichnoth <jstichnoth at mythtv.org> at Fri, 8 Aug 2014 13:01:36 -0700
URL:       http://code.mythtv.org/cgit/mythtv/commit/?id=6788ea9ab34b86a1b7f18a540f91d5c5514f4665

Make seeks faster for slow decoders / large keyframe distances.
Exact seeking for HD-PVR recordings can be notoriously slow because
the keyframe distance is 128 frames and decoding (even GPU hardware
decoding) is often little faster than real-time.

In most cases, it's a much better user experience to make a less
accurate but much faster seek to the preceding keyframe.

There are two changes:

1. Impose a maximum wall-clock time on the forward frame-by-frame
seeking.  After this maximum time elapses, abort any further frame
seeking.

2. In addition, try to predict whether fully accurate seeking will
complete within a reasonable time, and if after a few frames it seems
hopeless, just don't bother seeking any further.

This approach allows fast decoders and video formats amenable to fast
decoding to continue to have exact seeking.

Fixes #12004.
(cherry picked from commit 33acfaf30747592b9fca0913b2c2f8832418d618)



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Summary of changes:
 mythtv/libs/libmythtv/avformatdecoder.cpp |   34 ++++++++++++++++++++++++++++-
 mythtv/libs/libmythtv/mythplayer.cpp      |    8 +++++-
 2 files changed, 39 insertions(+), 3 deletions(-)

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