[mythtv] Ticket #6982: FF/Rew speed is way off for HD-PVR recordings

Mark Buechler mark.buechler at gmail.com
Wed Sep 9 13:42:05 UTC 2009


On Sat, Sep 5, 2009 at 1:11 AM, Greg Woods <greg at gregandeva.net> wrote:

> On Fri, 2009-09-04 at 20:55 -0500, David Engel wrote:
> > On Fri, Sep 04, 2009 at 04:15:17PM -0600, Greg Woods wrote:
> > > On Fri, 2009-09-04 at 21:57 +0000, MythTV wrote:
> > > > #6982: FF/Rew speed is way off for HD-PVR recordings
> > >
> > > Is there any way this could be responsible for another issue I've
> > > noticed with HD-PVR recordings, namely jump backs?
> >
> > Hmm, now that you mention it, I think everytime I've seen the problem,
> > it's also been while watching baseball or auto racing slightly behind
> > real-time.  Obviously, the HD-PVR hates sports! :)
> It's probably because sports is one thing you can't just watch the next
> day, because you'll know how the game turned out. So sports is something
> I typically watch while it's still recording, with only an hour or so
> time delay.
> >
> > Are you using VDPAU or software decoding
> VDPAU, with a GeForce 9500GT.
> >  and have you seen the problem
> > with MPEG2 recordings as well?
> Like the ones from my HD Homerun? No. But then I hardly ever record
> anything off the HDHomerun during the summer. Once football season
> cranks up, I'll record more from the broadcast networks that are
> available to my HDHomerun and I'll be able to be more sure about that.
> I can say that I have not seen this at all with the SD recordings coming
> off the PVR-500 (which are also MPEG but I display everything using
> VDPAU) and there are a lot of things I have recorded that way.
> > I'm curious to see/hear if it happens using VDPAU
> > on MPEG2 recordings.
> I'll let you know next week about MPEG HD.
> I am happy (for me, not for you )-: that finally someone else has
> acknowledged seeing this problem. I have mentioned it a few times on the
> users list and gotten zero response, so I was beginning to think there
> was just something mysteriously wrong with my system. I first noticed it
> during the Stanley Cup playoffs last spring, when I first started
> running trunk and using an HD-PVR, so it's been with me from the very
> beginning.
> --Greg
> I don't know if this is related, but using ffwd on HDPVR recordings will
cause the video to be way bind for upwards of a minute before catching up
(NVP drops frames). I've found that if  DecodeExtraAudio is set to 0, avfd
doesn't cache video frames and ffwd works as expected.

- Mark.
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