On Mon, 07 Feb 2005 17:53:58 -0800, Chris Petersen <[EMAIL PROTECTED]> wrote: > > Since I've had tons of trouble exporting my PVR-250 recordings to DVD > > (see archives for my posts on audio sync issues), I'm trying out my > > options for my older WinTV-FM card, which is also in my Myth box. > > Why not just record at dvd size, and then just remux them? Shouldn't > need to do any encoding at all.
The PVR-250 records directly to mpeg2, but the WinTV-FM can't. I think it's set to use MJPEG, but I wouldn't swear to that. My trouble with the 250 was that when I used nuvexport mpg2->mpg2 cut (or manually did a commercial cut with avidemux and then a remux), the audio on the exported mpg2 would gradually get off sync. Fine at the beginning of the show, then very bad by the end. Usually noticeable after the first commercial break. I am able to do successful commercial cuts if I manually capture the show from the 250 at the command line using cat, then edit with avidemux and remux. The audio sync was only for shows captured via Myth. Last night, however, I finally got it working properly. I made a new recording profile and used the defaults for it. I had the 250 record a show in Myth, then successfully did an mpg2->mpg2 export with nuvexport. The end result had no audio sync problems. When I get home tonight I'll try to post the different settings. I do know that they are not very different. IIRC, the new one uses 480x480 capture resolution and the old used 352x480. Very odd. > > Transcoding took 2.5 hours for a half hour show. > > This does not seem right. I have a 2.8 GHz P4 HT with 512 MB RAM. I'm > > running 0.16 on FC2. > > Sounds about right to me. mpeg2enc SUCKS. I did re-add multi-cpu > support to nuvexport last week (in my earlier tests it was actually > slower to have it enabled -- not so anymore). The latest nuvexport also > uses ffmpeg for encoding, which is considerably faster than transcode > (unless you turn on noise reduction, then they're about the same). Thanks for the info. Hopefully my mpg2->mpg2 exports will continue to work and I won't have to mess with transcode. To get the new nuvexport, can I use the download link from your web site, or will I have to upgrade to myth 0.17 when Isaac puts that out later this week? > > While watching the output of transcode through nuvexport, I observed > > my fps rate steadily decrease during the transcoding process. The high > > was near 200 fps when transcoding started. The fps rate dropped > > relatively quickly at first, to around 30 fps, then dropped steadily, > > and was at 7 fps at the end of the process. > > you cut out commercials, right? If so, then the initial high fps is > because the fps count doesn't know that. So if you go from frame 1 to > frame 1000 in the first few seconds, you get a high fps rate. I could > make things more accurate, but figured that people would rather have > their CPU being used to encode rather than to calculate a more accurate fps. Yes, I cut commercials. Makes sense then that the initial fps is very high. But why would the rate continue to drop throughout the entire process? Thanks Chris, Lane -- Meetup with other Myth users! http://mythtv.info/moin.cgi/MUG
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