[mythtv-users] Re: Re: Transcode to DVD-compatible MPEG-2 without quality loss?

[Steve Adeff]

On Tuesday 25 October 2005 15:46, Steve Adeff wrote:
> On Tuesday 25 October 2005 13:47, Mike Frisch wrote:
> > On Mon, Oct 24, 2005 at 11:03:55PM -0400, Steve Adeff wrote:
> > > I need to see if mencoder requires the ProjectX step or not (I think
> > > the mplayer demuxer is able to handle the file without the need
> > > though), but i think I might be passing all my recordings through
> > > mencoder for processing (ivtc, crop, resize), save as a huffyuv and
> > > then open in avidemux2 for commercial cutting and final encode.
> >
> > How do you tell mencoder to simply remux the file instead of transcoding
> > it?
>
> -oac copy -ovc copy -f mpeg (or maybe its mpg?)
> should work
>
> > > Which is kinda nice, cause I think one can then setup MythTV to
> > > automatically run the mencoder part right after recording(or during? i
> > > haven't looked into this part of MythTV yet), with custom settings for
> > > the show in question for the shows I want to backup, then take the
> > > huffYUV file and edit in avidemux2.
> >
> > Sounds good!  I haven't tried doing this conversion using ProjectX from
> > within MythTV, but that would be very useful.
> >
> > java -jar ProjectX.jar -out outdir srcfile.nuv
> >
> > works great from the console without the need for user interaction.
>
> I'm hoping mencoder doesn't require the ProjectX step, and from what I can
> see, it doesn't. Of course, the file I just tried it on will now not open
> in avidemux for some reason, even though the last couple I ran this through
> worked. Go figure. I'm hoping mean (the avidemux2 guy) can figure out the
> ish as being able to run:
>
> mencoder inputfile.mpg $1 -oac copy -ovc lavc -of avi -noodml -vf
> pullup,softskip,crop=1272:712:0:0,scale=960:528 -ofps 24000/1001 -lavcopts
> vcodec=huffyuv:format=422p:aspect=1.78 -o outputfile.avi
>
> while a recording is going will set me up for loading it in avidemux for
> commercial cutting and a final encode with XviD and should cut my
> processing time down by about an hour.
>
> For those that don't care about cutting commercials, if you use -ovc xvid
> and use the xvid options or lavc's mpeg4 (the defaults are great for both,
> just give it a final output size) you can fit an HDTV show into 700megs
> that is from what I can tell at worse 95% of the original file.
>
> > In the meantime, I've written a quick little perl script that dumps the
> > program description, filename, and date so I can see what file is what
> > show.
>
> you mind sending out that perl script? I'd find it very useful!
>
> thanks,
> Steve
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addendum:

mencoder inputfile.mpg $1 -oac copy -ovc lavc -of avi -noodml -vf 
pullup,softskip,scale=960:544 -ofps 24000/1001 -lavcopts 
vcodec=huffyuv:format=422p:aspect=1.78 -o outputfile.avi

(ie, remove the crop and leave the scale. the other line was my attempt to 
remove the unneeded lines, but it turns out, its not a big deal, and to just 
leave them in makes no difference, this is also slightly faster.

Steve