On Mon, 13 Dec 2004 14:40:31 -0800, Scott Alfter <[EMAIL PROTECTED]> wrote: > On Mon, Dec 13, 2004 at 03:22:19PM -0600, Lane Schwartz wrote: > > > > I've hit a big snag - when I export the recordings and cut the > > commercials with nuvexport (MPEG2->MPEG2), the audio on the exported > > recording is way out of sync. Note that when I play the original files > > in Myth or mplayer, the audio sync is just fine. > > > > I tried opening the recording with avidemux, cutting the commercials, > > exporting raw audio and video, then manually remuxing them with mplex > > (as per instructions in section 21.19 of Mythtv.org docs). I still get > > a final mpg with out-of-sync audio. > > Since the files play back properly, that would rule out MythTV and ivtv as > the source of the problem. nuvexport appears to not work at all for me...it > grinds away for several minutes but ends up producing nothing.
I thought about that. But I also think that the problem could still be ivtv or Myth. After all, the files play just fine - but there could be something screwed up in the MPEG encoding that makes them unfit for editing. I have no way to prove that, but I'm wondering... > I have copied several MPEG-2 program streams over to a Windows box and > edited them with a combination of DVD2AVI, Avisynth, LAME, BeSweet, and > TMPGEnc. The DVDs that I've made from shows processed this way have all > worked flawlessly, with no sync problems. That would also rule out MythTV > and ivtv as the source of your problem; it sounds more like an issue with > nuvexport and/or the apps nuvexport calls on to do its work. > > (What those issues would be, though, I don't know. I haven't had much time > to play with nuvexport yet, and I suspect that if I want to put Enterprise > on DVD at 4400 kbps video, I'd probably get better quality by recording at a > higher (6000-8000 kbps) rate, editing, and reencoding with TMPGEnc at 4400 > kbps VBR than by recording at 4400 kbps (the PVRx50's encoder is CBR, > right?) and dumping that to DVD. I've not tried a comparison of the two, > but my gut instinct is that at a given target bitrate, a non-real-time > software encoder can produce better results than a real-time hardware > encoder.) You may be right, but software encoding wastes so much time that I don't really consider it to be an option. That's the whole reason I have a PVR-250. Plus, the really annoying thing is that I had it all working on my old box running FC1. If I have time over Christmas I may try to revert to a 2.4 kernel with a corresponding older ivtv. Does anyone with a PVR-250 have exporting to DVD working successfully using MPEG2->MPEG2 cutting? Thanks, Lane -- Meetup with other Myth users! http://mythtv.info/moin.cgi/MUG
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