[mythtvnz] Good parameters for mencoder conversion of TV3 Myth recording to DivX?

[Phil Bertram]

On Thursday 16 August 2007 8:19 pm, Phil Bertram wrote:
> On Thursday 16 August 2007 6:25 pm, Matt Poff wrote:
> > Hi,
> >
> > I've been trying to set-up a good mencoder command string to downsample
> > and convert some TV3 recordings but i'm getting some weird aspect ratios
> > with the result...
> >
> > The first string i tried was this:
> > |mencoder -o FILE.avi -of avi -ffourcc DX50 -lavcopts vbitrate=750:vhq
> >
> > -ovc lavc -oac mp3lame -vf pp=lb FILE.mpg
> >
> > But the results were an almost square picture area (squeezed
> > anamorphic?) with a lot of black space around the frame. I tried using
>
> I'm assumming this is when TV3 are broadcasting a 4/3 programme  in their
> 16/9 frame.
>
> > the autocrop feature to detect  picture boundaries:
> > ||mencoder -o FILE.avi -of avi -ffourcc DX50 -lavcopts vbitrate=750:vhq
> >
> > -ovc lavc -oac mp3lame -vf cropdetect FILE.nuv|
>
> see below........
>
> > Still the same problem. The generated output is 720x576 in both cases.
> > Does anyone have any settings they use to get correct aspect ratio
> > transcodes from TV3 recordings?
>
> Try using this,
>
> mplayer -vf cropdetect FILE.nuv
>
> mplayer will print out a cropping parameter eg. 528:416:96:82
>
> then
>
> mencoder -vf crop=528:416:96:82,scale=720:576 -lavcopts
> vaspect=4/3:vbitrate=750:vhq etc etc add your other parameters as necessary
Sorry, not vaspect but aspect=4/3.
-lavcopts autoaspect is likely to work also
>
> Phil
>
> > Thanks,
> > Matt
> >
> >
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