"Steven M. Schultz wrote:"
First, thank you very much for the respones and helpful information.
>
>
> On Fri, 25 Aug 2006, David Highley wrote:
>
> > I thought in the original posting I had said:
> > I use nuvexport-dvd to go from nupple to mpeg2 which uses mythtranscode
>
> There was mention of nuvexport-dvd but that unless one has nuv*/myth*
> or knows what that means it doesn't appear to have anything to do
> with mpeg2 encoding.
>
> > and ffmpeg. Commercials are cut in this process.
As it turns out, ffmeg does have an option:
-maxrate bitrate
Set max video bitrate tolerance (in kbit/s).
But the nuvexport Perl scripts do not provide an option for limiting the
bit rate.
> ffmpeg's rate control still having issues is my guess what's happening.
>
> That data's taking a lengthy and tortured path to DVD ;)
If I knew a shorter A to B route I would take it. I'm about 18 months
into this personal video recording adventure. It took 6 months to get
the cards working the first time before kernel and driver updates broke
everything. Then I had to RMA the PVR 500 card because the coax barrel
broke off the card mount block. Card came back with a different tuner
chip which required more waiting for the ivtv driver to be updated to
support the new tuner chip. Then other changes seem to have broken the
analog audio for the HD3000 card, at least two month now.
I switched to subversion head for the mythtv distribution to get other
changes and the channel listing will not load into the database.
Certainly not ready for the average consumer anytime soon.
Do not think Windows Media Center is any better. We have purchased two
systems and one has never been able to run Media Center. The other one
required a rebuild after a virus attack. It was very hard to get working
again.
> But I think now there's enough info available to take a good guess
> at what's going awry. Thanks.
>
> > In my case I get a nupple mostion jpeg file recording with mythtv as the
> > card does not have mpeg hardware.
>
> Which card is this? A WinTV or similar Bt8x8 card?
WinTV card from ATI.
> > If I could only get the new system working that would change as I have a
> > PVR 500 and an HD3000 card in the new system.
>
> I saw mention of a HD5500 recently.
Replacement for the HD3000 which is no longer available.
> There's a possibility that'll just move your problems to a different
> area. Maybe not though. If editing/cutting to 1/2 second accuracy is
> sufficient then you can use ProjectX to do the editing. For HD
> you'll need to do some additional processing of course ;)
>
> Back to the problem...
>
> Somewhere thru the path the data is taking 'ffmpeg' is being used
> to do encoding to MPEG-2 using the 9Mb/s. That is a VERY high rate
> and leaves little headroom for spikes. TO encode and that rate
> and not exceed the max allowed for DVD requires *VERY GOOD* rate
> control in the MPEG2 encoder.
>
> mpeg2enc's rate control has been quite good but has become even
> better in the CVS version.
>
> ffmpeg's rate control had issues at one time, but I'd thought they'd
> been fixed. Maybe there are some additional parameters that can
> be passed thru to ffmpeg to improve the rate control - I don't know
> what they are.
It seems to be the best of the 3 choices for nuvexport; ffmpeg,
transcode, mencoder.
> Try using a lower rate - I'd try 8Mb/s and see if that works. If not
> and if switching encoders isn't an option then I think you'll need to
> get on the ffmpeg-users mailing list.
Thanks again, I will not waste anymore bandwidth on this issue.
David Highley
> Cheers,
> Steven Schultz
>
>
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