[mythtv-commits] mythtv commit: r7427 - in trunk/mythtv by danielk

[mythtv at cvs.mythtv.org]

      Author: danielk
        Date: 2005-10-09 19:10:18 +0000 (Sun, 09 Oct 2005)
New Revision: 7427
   Changeset: http://cvs.mythtv.org/trac/changeset/7427

Modified:

   trunk/mythtv/libs/libmyth/mythcontext.h
   trunk/mythtv/libs/libmythtv/tv_rec.cpp
   trunk/mythtv/libs/libmythtv/tv_rec.h
   trunk/mythtv/programs/mythbackend/encoderlink.cpp
   trunk/mythtv/programs/mythbackend/mainserver.cpp
   trunk/mythtv/programs/mythbackend/playbacksock.cpp
   trunk/mythtv/programs/mythbackend/playbacksock.h
   trunk/mythtv/programs/mythbackend/scheduler.cpp

Log:

Fixes #320.

This fixes two additional problems that cause lost follow on recordings:
 * Overrecord race problem, an old problem that was made worse 
   by event loop improvements.
 * Clock drift problem, another old problem.

Fixing the clock drift problem required a MythTV protocol change
so you must upgrade all your backends & frontends. Basically, it
adds a GET_CURRENT_RECORDING query so that we can find out if the
slave backend is recording something the master backend thinks
should be done by now.

It is still important to keep the backend clocks in sync with 
something line NTP, but with this commit minor clock drift will
only mean you might lose a few seconds of you recording, not
the entire follow on recording.

The overrecord race problem is also made worse by a clock 
drift, basically if the slave is over 2 seconds "slower" than
the frontend you almost always lost the race, otherwise you
lost the race in rough proportion to how far you were out
of sync with the master backend's clock.