[mythtv-users] Does time stretch make your MPEG-2 sound gurgle?

[Michael T. Dean]

Mark Kundinger wrote:

>--- Mark Kundinger <mkundinger at yahoo.com> wrote:
>
>>--- "Joseph A. Caputo" <jcaputo1 at comcast.net> wrote:
>>
>>>On Thursday 20 October 2005 1:40, Mark Kundinger wrote:
>>>      
>>>
>>>>If I time stretch a recording, the audio seems to get "gurgly" (minor, sporadic, pitch or tempo changes).  This is most notable with programs that like to do big dramatic musical scores with lots of violins (think West Wing).  The strange part is that even if I set the time stretch back to 1.0, the gurgling is still there.  However, if I exit back to the menu and re-view the recording, sound is fine.
>>>>
>>>>Most of my recording is done on a PVR-250, so the recordings are MPEG-2.  I have a MJPEG recorder too, and it doesn't *seem* that the problem still exists there, although I'm not positive, because I don't have as many recordings for that.  For sound output, I'm using the Nforce2 sound on my motherboard with Nvidia's driver.
>>>>
>>>>So, anyone else seen this?  Right now I have no idea where the problem lies.
>>>>
>>>What decoding method are you using to play back your MPEG-2 recordings (normal/ffmpeg, libmpeg2 or XvMC) ?
>>>
>>Ooh, that's a very good question.  I have no special options selected, so I'm using normal/ffmpeg.  And I am using a SVN from a week or two ago.  I can try out libmpeg2 on my next tv watching bout.
>>
>I got a chance to try out this week's recording of West Wing (still by
>far the best test case), and the "gurgle" still happened, whether I
>used libmpeg2 or ffmpeg.  So I'm thinking the problem is either
>MythTV's playback, or something involving the capture.
>
>Can vanilla mplayer or xine do time stretch?  If so, I could try the
>recording with those players to see if the gurgle still happens...
>  
>
xine has a time stretch plugin called "stretch" but note that it appears 
in the audio post-processing "Chain Reaction" not in the video one.

Mike