[mythtv-users] Re: Getting good audio sync in nuvexport/transcodings w/cutlist?

john sturgeon john.sturgeon at gmail.com
Thu Jun 2 22:33:09 UTC 2005

ProjectX does actually have a nice cutting interface, the ability to
export/import cutlists, a graphical 'timeline' which shows red/green
cut points.  It's very slick, add to that the fact that once you
generate a cutlist, ProjectX can process the entire video from the
command line (for batch processing).

John <><

On 6/2/05, Brad Templeton <brad+myth at templetons.com> wrote:
> On Thu, Jun 02, 2005 at 04:16:29PM -0400, Cory Papenfuss wrote:
> > >Worth a try, though I presume one would have to then do some more to be
> > >able to export mythtv's cutlist.   The grail, of course, is to take
> > >a mythtv recorded program with cutlist, and generate a cut-down mp2 or
> > >mp4 with good audio sync which can either be played externally
> > >(mplayer/xine
> > >or players on other OSs) or reincorporated back into myth.
> > >
> > >(Of course, if myth's internal transcode did better on HD files, that
> > >would be the easiest way to attain the latter goal.)
> > >
> > >What will projectX do for me?  It doesn't appear to have editing.
> > >Is it just to get the file into a place where avidemux2 can read it
> > >without losing audio sync?
> > >
> >
> >       It took me awhile to work up the ambition to anally insert Java
> > enough to make ProjectX go.  Once I did, I was surprised at how much
> > functionality it had.  It will do cutting, and when it does so it parses
> > the stream and tries to correct varying A/V offsets after the first cut.
> > Looked really good, but like I said, some folks have been having subtle
> > issues with the sync of cut streams.
> Frankly, at this point, I would be happy with a cutting program that was
> given the leeway to move cutpoints to nearby I-frames or A/V sync points so
> that there is no rebuilding to be done, and no risk of loss of sync.
> For a full fledged editing studio, you need to edit to exact frames, but
> for elmination of commercials or extra snippets at the start and end of
> recordings, a little leeway is fine.
> Particularly if, for example, you just have a series of programs that
> you will not be watching for several months, programs that have a cutlist
> so you won't watch the cut parts if you watch them now, and you just want
> to delete the stuff you would not have watched anyway from your disk.
> I will check into project X, the web examples did not imply an easy cutting
> interface.  Myth has a reasonably decent cutting interface, though if I
> were designing it I would add mouse/trackball support to make it really
> easy to slide and search through the program for the cutpoints you want.
> I can imagine a nice mouse interface that went like this:
>     a) Click to start hunting.  Roll mouse, picture zooms by very fast.
>        The screen's worth of movement covers the entire video.
>        Get close to your cutpoint.
>     b) Click again and now the mouse movement moves more slowly, the full
>       screen of movement covers just a minute or two.  Get closer
>     c) Click again and the full sweep is now just a few seconds
>     d) Click again and the sweep is just 30 frames or so.  Ideally
>         the frames are actually displayed as thumbs.  Final double
>         click to pick frame.  right click to go back up.
> I bet with an interface like this I could move to any frame I wanted
> in a little back and forth of the mouse, in very short time.
> Beyond what myth needs, though.
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