[mythtv] Recorded show plays back with time stretch

[Joseph Fry]

>
> I have been using MythTV for more than 5 years, and don't remember seeing
> anything like this before. Any ideas? I just started recording The Wiggles
> for my children. I have recorded four episodes across two weekends.
> Recording is done via HDHomerun from ATSC antenna source. All four episodes
> play back (from the Watch Recordings menu option) at a very slow rate. I
> have tried playing on two different frontends with the same results on
> both. If I manually adjust the time stretch to 1.0x, then they play at
> normal speed. I was hopeful that transcoding the episodes (after I cut
> commercials) would fix the problem, but no change.
>
> I have over 1000 recordings on my backend, many of them recorded on the
> same channel (NBC) from the same tuner. I don't know what's different about
> these four shows. The frontend log has a suspicious entry in it:
> "(SetStretchFactorLocked) AO: Using time stretch 0.45".
>
> Here is the relevant section of a frontend log file:
>
>
> Aug 31 07:30:14 ZBox-down mythfrontend[2649]: I CoreContext
> tv_play.cpp:987 (TV) TV: Creating TV object
> Aug 31 07:30:14 ZBox-down mythfrontend[2649]: N CoreContext
> mythmainwindow.cpp:2591 (PauseIdleTimer) Resuming idle timer
> Aug 31 07:30:14 ZBox-down mythfrontend[2649]: N CoreContext
> mythmainwindow.cpp:2586 (PauseIdleTimer) Suspending idle timer
> Aug 31 07:30:14 ZBox-down mythfrontend[2649]: I CoreContext
> tv_play.cpp:1206 (Init) TV: Created TvPlayWindow.
> Aug 31 07:30:14 ZBox-down mythfrontend[2649]: I CoreContext
> tv_play.cpp:2121 (HandleStateChange) TV: Attempting to change from None to
> WatchingPreRecorded
> Aug 31 07:30:15 ZBox-down mythfrontend[2649]: N CoreContext
> audioplayer.cpp:167 (ReinitAudio) AudioPlayer: Enabling Audio
> Aug 31 07:30:15 ZBox-down mythfrontend[2649]: I CoreContext
> avformatdecoder.cpp:2102 (ScanStreams) AFD: Opened codec 0xae17b50,
> id(MPEG2VIDEO) type(Video)
> Aug 31 07:30:15 ZBox-down mythfrontend[2649]: I CoreContext
> avformatdecoder.cpp:1960 (ScanStreams) AFD: codec AC3 has 6 channels
> Aug 31 07:30:15 ZBox-down mythfrontend[2649]: I CoreContext
> avformatdecoder.cpp:2102 (ScanStreams) AFD: Opened codec 0x9ad6340, id(AC3)
> type(Audio)
> Aug 31 07:30:15 ZBox-down mythfrontend[2649]: I CoreContext
> audio/audiooutputbase.cpp:791 (Reconfigure) AO: Opening audio device
> 'iec958:CARD=Intel,DEV=0' ch 2(6) sr 48000 sf signed 16 bit reenc 1
> Aug 31 07:30:15 ZBox-down mythfrontend[2649]: E CoreContext
> audio/audiooutputalsa.cpp:195 (SetPreallocBufferSize) ALSA: Setting
> hardware audio buffer size to 128
> Aug 31 07:30:15 ZBox-down mythfrontend[2649]: E CoreContext
> audio/audiooutputalsa.cpp:211 (SetPreallocBufferSize) ALSA: Error opening
> /proc/asound/card0/pcm1p/sub0/prealloc: Permission denied.
> Aug 31 07:30:15 ZBox-down mythfrontend[2649]: E CoreContext
> audio/audiooutputalsa.cpp:213 (SetPreallocBufferSize) ALSA: Try to manually
> increase audio buffer with: echo 128 | sudo tee
> /proc/asound/card0/pcm1p/sub0/prealloc
> Aug 31 07:30:15 ZBox-down mythfrontend[2649]: E CoreContext
> audio/audiooutputalsa.cpp:545 (OpenDevice) ALSA: Unable to sufficiently
> increase ALSA hardware buffer size - underruns are likely
> Aug 31 07:30:15 ZBox-down mythfrontend[2649]: I CoreContext
> audio/audiooutputbase.cpp:353 (SetStretchFactorLocked) AO: Using time
> stretch 0.45
> Aug 31 07:30:16 ZBox-down mythfrontend[2649]: I CoreContext
> mythpainter_ogl.cpp:62 (ClearCache) Clearing OpenGL painter cache.
> Aug 31 07:30:17 ZBox-down mythfrontend[2649]: I CoreContext
> mythrender_vdpau.cpp:1675 (CreatePresentationSurfaces) VDPAU: Created 2
> output surfaces.
> Aug 31 07:30:17 ZBox-down mythfrontend[2649]: I CoreContext
> mythrender_vdpau.cpp:401 (Create) VDPAU: Created VDPAU render device
> 1920x1080
> Aug 31 07:30:17 ZBox-down mythfrontend[2649]: N CoreContext
> mythplayer.cpp:506 (CheckExtraAudioDecode) Player(3): Forcing decode extra
> audio option on (Video method requires it).
> Aug 31 07:30:17 ZBox-down mythfrontend[2649]: E CoreContext
> mythplayer.cpp:2308 (VideoStart) Player(3): Video sync method can't support
> double framerate (refresh rate too low for 2x deint)
> Aug 31 07:30:17 ZBox-down mythfrontend[2649]: I CoreContext
> mythplayer.cpp:1737 (InitAVSync) Player(3): Video timing method: USleep
> with busy wait
> Aug 31 07:30:17 ZBox-down mythfrontend[2649]: I CoreContext
> tv_play.cpp:5169 (StartPlayer) TV: Created player.
> Aug 31 07:30:17 ZBox-down mythfrontend[2649]: I CoreContext
> tv_play.cpp:2360 (HandleStateChange) TV: Changing from None to
> WatchingPreRecorded
> Aug 31 07:30:17 ZBox-down mythfrontend[2649]: I CoreContext
> tv_play.cpp:2451 (HandleStateChange) TV: Main UI disabled.
> Aug 31 07:30:17 ZBox-down mythfrontend[2649]: I CoreContext
> tv_play.cpp:378 (StartTV) TV: Entering main playback loop.
> Aug 31 07:30:17 ZBox-down mythfrontend[2649]: I CoreContext
> mythrender_vdpau.cpp:587 (CheckOutputSurfaces) VDPAU: Added 2 output
> surfaces (total 4, max 4)
> Aug 31 07:30:17 ZBox-down mythfrontend[2649]: I CoreContext
> subtitlescreen.cpp:766 (InitializeFonts) InitializeFonts()
>
>
I feel your pain... 30 minutes of the wiggles is bad... stretching it out
to over 60 minutes sounds like a nightmare come true.

Sounds like you have a playback group assigned to the Wiggles?  Never used
playback groups, but I believe you can set the speed on them.
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