[mythtv-users] Recordings Playback too fast on Frontend, fine on Backend

[Michael T. Dean]

First, no need to bump your post after 53 minutes--or, more likely, what 
you missed was--yes, your post went through.  <rant>Thanks to gmail's 
"it's not e-mail, it's g-mail, so we do things differently" interface, 
you don't get to see your messages until someone replies to them.  (How 
wonderful of them to invent a replacement for e-mail...)</rant>  Please 
always check the archives before re-sending a post.  
http://www.gossamer-threads.com/lists/mythtv/ may take many (up to 12) 
hours to be updated to include new posts; whereas, 
http://mythtv.org/pipermail/mythtv-users/ is updated "immediately."

Answers inline...

On 03/01/2009 12:12 PM, jk90090 wrote:
> Just replaced my OTA tuners with an HDHomerun, pulling video from 
> QAM.  Recordings happen as expected, but when I go to playback the 
> recordings, some (FOX it seems) playback tooo fast, as if I've 
> increased the playback speed, and the video & audio don't sync.

This is one or both of 2 configuration issues.  Make sure you do /not/ 
enable the "experimental" (= "do /not/ use this setting, it doesn't work 
because the video in the real world is all broken") setting:

Use video as timebase
Use the video as the timebase and warp the audio to keep it in sync. 
(Experimental)

and make sure you configure your audio subsystem (outside of Myth) to 
enable playback of audio with sample rates other than 48kHz.  You may be 
playing back a recording with 32kHz audio, but your sound card is 
slurping it up at 48kHz, making it play back faster and making voices 
sound "like chipmunks."

See http://www.mythtv.org/wiki/index.php/Configuring_Digital_Sound (and 
try to ignore all the completely wrong information on the page) for more 
info.  (And note that if you value your time, it may be cheaper to just 
get a new sound card that sets up more easily.  The Turtle Beach Riviera 
is one of the favorites on this list.)

>   Also of note is that the recording time length (say 59:32) is half 
> of what it should be (say 30:21).

That's "normal."  It's only a display-related bug whose fix requires a 
lot of work, so is not high priority, but occasionally (over the years) 
some of the patches that are committed move us a small step forward 
toward a proper fix.  It should be fixed around MythTV 1.0 or so.  ;)

>   The backend plays the recordings fine (though also shows the time 
> length incorrect, and seconds take twice as long to tick by), and VLC 
> will play the recordings fine on my Vista PC.  Ideas? 

The backend's audio is probably properly configured.

Mike