[mythtv-users] Cutting commercials without expensive transcoding

[Anthony]

Is there anyway to pass a cutlist to avidemux2? I have looked at the
commandline parameters in the docs but it doesn't appear that there is a
way?

--Anthony

> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org [mailto:mythtv-users-
> bounces at mythtv.org] On Behalf Of James L. Paul
> Sent: Saturday, March 13, 2004 1:12 PM
> To: Discussion about mythtv
> Subject: Re: [mythtv-users] Cutting commercials without expensive
> transcoding
> 
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> On Thursday 11 March 2004 6:22 pm, Len Reed wrote:
> > Hi,
> >
> > I'm no video expert, so maybe I misunderstand the problem.  Or maybe I'm
> > missing a simple answer that's already there.
> >
> > I have a PVR250, so my .nuv files are mpeg2 with video and audio
> > multiplexed in them.  After I've marked the commercials (i.e., started
> > with myth's guesses and tweaked them using the built-in cut editor), I'd
> > like to do two things:
> >
> > 1. Remove the dreaded commercials in order to shrink the file.
> 
> I also use PVR250 output. I still remove commecials manually with
> avidemux2
> when I want to archive to CVD or DVD. I only cut on keyframe boundaries.
> 
> > and optionally
> >
> > 2. convert to a plain mpeg2 for use in burning a DVD.  (The issue here
> > may be my poor DVD authoring s/w.  mplayer plays the unmolested .nuv
> > files.  OTOH, mplayer will play almost anything.)
> 
> This has been discussed on this list, with specific steps. It's very easy.
> The
> output of the PVR250 will work fine on a DVD with no transcoding. I just
> cut
> out the commercials with avidemux2, remultiplex with DVD nav headers and
> pass
> it to dvdauthor. I have burned many DVDs and CVDs from non-transcoded
> PVR250
> output captured from my MythTV box. The video format is fine, the audio
> format seems to work on most DVD players also. (Technically, I think
> standard
> players aren't required to play MPEG audio is AC3 audio isn't present, but
> I
> haven't heard of a case yet where it doesn't work anyway.)
> 
> >
> > I've tried using various methods to accomplish #1: the built-in
> > transcoding (press 'x'), nuvexport, etc.  The problem with all of them
> > is that they do time-consuming transcoding.
> 
> I'm not aware that anybody has a fully automated process for this from
> within
> myth. There are people working on it though.
> 
> > I don't want to change the bit rate or the format, I just want to lift
> > the parts that have the actual program, leaving behind the ads.  It
> > seems that that should take, in theory, about as much time as it takes
> > to read the parts of the original file that I care about and write them
> > out.  No serious computation, though maybe a bit of knitting around the
> > edges.
> 
> The basic key to this is to capture in a DVD-compliant stream format in
> the
> first place. You should only need to transcode if your captured stream is
> the
> wrong resolution or bitrate.
> 
> > So,
> >
> > a. Am I missing something that this makes this far more computationally
> > intensive than I think?
> 
> Nope. It's more a matter of automation. We need a tool that can accurately
> do
> keyframe edits based on the cutlist, remultiplex the results for
> dvdauthor,
> then create and burn a DVD image.
> 
> > b. Am I missing an existing tool that does what I want?
> 
> We all are. ;) As is common for open source tools, the building blocks all
> exist. We simply need to build something polished with them. MythTV is a
> shining example of this process, and it's still relatively young yet.
> 
> > Thanks,
> > Len
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