[MPlayer-users] mencoder cropping does not work?

horst.schlonz at gmx.de horst.schlonz at gmx.de
Sun Jan 11 15:37:22 CET 2004

Am Dienstag, 6. Januar 2004 21:49 schrieb D Richard Felker III:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> On Tue, Jan 06, 2004 at 09:30:37PM +0100, horst.schlonz at gmx.de wrote:
> > [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> > the main problem is i want to create a dvd-video with 3 svcd as source
> > and the nero vision express program.
> >
> > Am Dienstag, 6. Januar 2004 19:12 schrieb Martin Emrich:
> > > If you use "-ovc copy", the input video stream is recoded but copied
> > > 1:1 to the output file, so the crop filter has no chance of changing
> > > the video. To use filters, use a "normal" codec, e.g. "-ovc lavc".
> >
> > this works. the black bars are cut off now.
> >
> > > But be aware that recoding a video reduces quality. Unless you also
> > > want to make the file significantly smaller, better leave it in the
> > > original format.
> >
> > the original format is 480x480 and has ridiculously big black bars.
> > therefore i get a dvd-video that wastes much space on the tv-screen not
> > only above and below the movie but also left and right because of the
> > black bars. i hope cutting off the bars will fix this.
> It won't. The 480x480 in svcd is scaled to fill the whole screen.

but the scaling did not work as i already wrote. the svcds were scaled to fill 
the whole screen, right. but the aspect ratio was totally fucked up.

> What
> you need to do when making a DVD is leave the black bars in place and
> scale to 720x480 (standard DVD size).

ok, i tried this (with pal-values, not ntsc). i also had to crop to maintain 
the correct aspect ratio:
$ mencoder -oac copy -ovc lavc -lavcopts vcodec=mpeg4 \
> -vf crop=480:384:0:48,scale=720:576 -o out.mpg avseq01.mpg

i fed up nero vision express with this and it generated perfect dvd-video. but 
the audio had quirks and was out of sync.

so, i gave up on this. thanks anyway.

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