[mythtv-users] How to Prevent Freeze When Starting Playback

[Jim Stichnoth]

On Tue, May 12, 2015 at 1:02 PM, Tom Wheeler <tomwheel at gmail.com> wrote:

> This problem still occurs for me. I tried the MySQL tuning advice from the
> Tune_MySQL page on the Wiki, but this had no effect on the delay. The disk
> drives are fine, and power saving is disabled.
>
> To summarize, the issue is that when I hit play on the "Watch Recordings"
> screen, there is almost always significant delay (of varying duration)
> before the program is actually shown. This happens on both the combined
> backend/frontend and the remote frontend that's connected to it via gigabit
> ethernet. Both systems are running Mythbuntu and MythTV 0.27. The delay
> only affects the start of program play, during which the screen appears
> frozen on the "Watch Recordings" screen (there's no "Please Wait" message,
> hourglass cursor, or other visual cue). Once the program begins playing,
> performance is fine.
>
> The problem has gotten worse over the last six months. It happens much
> more frequently and with much longer delays (now averaging about 20 seconds
> and taking even three minutes in some rare cases). It occurs with
> recordings of any resolution, ranging from 1080p HD programs all the way
> down to old 1960s-era black-and-white SD recordings. The delays seem to be
> a little longer for higher resolution programs, but that may be perception
> or coincidence.
>
> Here's the log from a session last night:
>
>    http://pastebin.com/ft9Mkn5F
>
> Here's the log from another session, after I started the frontend using
> the "-v playback" flag:
>
>    http://pastebin.com/D3eVX0HA
>
> Any ideas as to what I could try in order to diagnose or fix it?
>
> From looking at the logs, is it possible that your recordedseek table
crashed?

It might also be helpful to collect "-v database" logs, since it does look
like a problem loading the position map from the recordedseek table.

Along these lines, if you try to edit the recording's cutlist during
playback, does it complain that the seektable is missing?

Jim
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