[ExtractStream] Re: DVD writing

[Michael Patterson]

I'd like to add my personal audio problems to this list :)

I've been working ont he DVD writing thing for some time, and I've gotten to
a frustrating point.

I split the ty stream into audio and video, and then manually add/remove
sound from the beginnning of the audio stream until I get it to synch with
the video.

Great! So I pipe it in through TMPEG to mux the streams (and do minor
editing), and find that there is a loss of sync part way through! (by
watching the end). I have not checked to find out where the two go out of
sync, but I have a suspiciion...

There are two spots where the video glitches slightly. These glitches dont'
show up on the TIVO, just my streams. I suspect this is causing the loss of
sync.

When I pull out the ty stream from the TIVO, I get about a 4gig file. If I
try to use mot tools to split the stream, or convert to MPEG2, I end up with
only about 250 megs of video data, which doesnt' play.

--Mike



> *BUMP*
>
> Billy, I was wondering if you got a chance to play with this anymore.
> I'm thinking about grabbing a DVD Writer this week, with 99% of its
> use for Tivo->DVD.
>
> Anyone else have any luck? I hate to spin my wheels. :) Thanks.
>
> --- In ExtractStream@y..., "billyb111b" <billyb111b@y...> wrote:
> > --- In ExtractStream@y..., "J. Scott Dorr" <merlin@f...> wrote:
> > > What resolution/bit-rate should I set to allow for the most
> > seamless dvd
> > > authoring? I'm not familiar with what the dvd resolutions are in
> > the U.S..
> > > Did I read that right that the resolution is 704x720? Please
> > clarify so that
> > > I can start recording my shows in dvd resolution and save me a
> > bunch of
> > > processor cycles in the future. :)
> >
> > I have Best at 352X480 and 5500kbs, It seems prety good in terms of
> > quality, but due to synch issues, I usually have to re-encode
> > anyway. (Does anyone know a good cheap multiplex program where you
> > can set an audio delay?)
> >
> > I believe the NTSC DVD resolutions for Mpeg 2 are 352x480, 704x480
> > and 720x480, and TiVO only encodes at the 352. Which is fine with
> > me, so long as the bitrate is reasonable. I am looking for a quick
> > way (without re-encoding) to archive TiVo streams to DVD, because
> > everytime I re-encode, (through Vdub, Nandub, VFAPI, CC you name
> it!)
> > I end up in frame-serving codec hell, and it takes hours and I am
> > never thrilled with the results (there are so many settings that
> can
> > screw you up - pulldown, IVTC, field order, deinterlace!!) and lets
> > face it, the video is already MPEG2, if its good enough for TiVo,
> its
> > good enough for me.
> >
> > One thing I have learned about getting clean extrtactions is NOT to
> > change resolution and quality levels. Pick one and stick with
> it!.
> > If you have variuous quality level recording around the drive, ES
> > will never pinpoint the actual sector locations, and you will get
> > tiny bits and pieces of all kinds of recordings in your streams.
> > This will then cause timecode jumps, synch problems and general
> > headaches during conversion/encoding/muxing. You should probly do
> > everything at best, so that recording on the fly doesn't screw you
> > up. I did not do this, and it haunts me still! I want to go back
> to
> > my backup and start over, but I have so much stuff awaiting
> > extraction.
> >
> > sigh
> >
> > and one more thing, nver set TiVo resolution resource above 4, and
> > absolutely never set Best Quality above 4. I believe 1 & 2 and
> > 352X480, 3 is 480x480 (SVCD) and 4 is 544x480. 5 or higher makes
> > TiVo go poof.
> >
> > > One vote from me. :)
> > > - scott
> >
> > When I settle on a working method, (I have a few, they all SHOULD
> > work, but they never work 100%) Ill try to assemble something like
> a
> > how-to.
>
>
>
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