On Mon, 28 Mar 2005, Jeff Simpson wrote:
I'll agree to this. The problem with "one-touch" dvd authoring from ivtv-captured files is that they're not consistent. Some procedures work well for some, and not for others. Two big problems are:While the outline looks good, I don't think the organization of the writeup was ever the brick wall preventing anything. The real lack is in decent software applications to do the job.(ie, I think we should be looking for people who can fix the missing parts rather than re-write up the workarounds)
but while we're at it, add these utilities to the toolbox, these are all I use to make dvds out of PVR-350 NUVs:
nuvexport (using avidemux2, MPEG2->MPEG2 cut option) dvdstyler (for making dvd iso) k3b (for burning dvd)
1. No lossless MPEG2 cutting that does not break streams. This would ideally be rolled into MythTV so when commercials are cut out of an MPEG2 stream, the losslessly-cut MPEG2 stream is what remains. Current somewhat working methods include:
A. avidemux: cut/demux/remux (what nuvexport does). This method works most of the time, but breaks when a capture does not have a constant A/V offset throughout.
B. gopdit/gopchop: cuts in-place. This method works somewhat, but the "correctness" of the resulting stream hasn't been fully verified. There are some details (timestamp manipulation, open/closed GOPs, "broken" GOPs, etc) that need to be investigated.
2. No MythTV support for MPEG2->MPEG2 cutting. Ideally, one would want to apply a cutlist to a capture to save the master footage on the backend with commercials removed. Since this tool doesn't yet exist properly, it's not rolled into MythTV proper... see #1 above.
Lather, rinse, repeat.
One other point to note is that the ivtv does a *horrible* job of producing low-mid quality captures. If one is trying to build a broadcast-quality archive DVD, they cannot record at a low enough bitrate to do so straight off the card without crappy quality. I use a 2-pass transcode to get very acceptable 2.2 Mbps 352x480 archival DVDs. Roughly 760MB per 42-minute show. That's 6 "hour-long" shows on one DVD. If you try to capture at that directly, it'll look horrible.
-Cory
************************************************************************* * Cory Papenfuss * * Electrical Engineering candidate Ph.D. graduate student * * Virginia Polytechnic Institute and State University * *************************************************************************
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