[mythtv] sound during fast forward/rewind on pvr350 when using it for tv-out

Joseph A. Caputo jcaputo1 at comcast.net
Thu Mar 18 12:45:48 EST 2004

On Thursday 18 March 2004 11:57, Simon Kenyon wrote:
> David Engel wrote:
> >On Thu, Mar 18, 2004 at 01:49:44PM +0000, Simon Kenyon wrote:
> >>with ivtv-fb. when i fast forward to rewind then it plays brief
> >>sequences of video as it goes. unfortunately, it also plays brief
> >>snatches of audio as well, which IMHO is annoying. this does not
> >
> >It's a known problem.  I don't know when it will get fixed since it
> >requires a significant change to the way Myth does ff/rew.
> oh well. i'll have to live with it so
> thanks for the quick answer

You could use the 'trick play' feature instead of bona-fide ff/rew.


+ gives 'smooth' rather than 'jumpy' ff/rew

- requires more CPU, as it actually decodes every frame, as opposed to 
skipping them like ff/rew does
- max. speed is lower than ff/rew

That said, I think ff/rew should be able to be re-worked so that it 
doesn't play sound.  Trick play obviously does it.

This has been an item on my list for a long time.  I wrote the initial 
implementation of the current ff/rew behavior, and at the time there 
was no clean way to mute the sound during ff/rew without modifying 
NuppelVideoPlayer, which Isaac didn't want me to do at the time.  Later 
the 'mute' functionality was added, and I thought I might be able to 
utilize that, but it would have been a kludge, and since the mute 
function doesn't maintain state, there was no elegant way to determine 
if the sound should remain muted or not when exiting ff/rew.  Then the 
trick play features were added, and I seem to recall ended up touching 
NuppelVideoPlayer to do things... I guess the author was able to make a 
better argument than I did at the time.

Maybe I'll revisit this, but actually it's not a priority right now; I 
think I'm going to remap my ff/rew keys to do trick play.  Anyone else 
is welcome to take a stab at it...


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