[FFmpeg-user] Misson, impossible?, Prescaling, a, video...

[Francois Visagie]

> -----Original Message-----
> From: ffmpeg-user-bounces at ffmpeg.org [mailto:ffmpeg-user-
> bounces at ffmpeg.org] On Behalf Of meino.cramer at gmx.de
> Sent: 25 October 2012 09:10
> To: FFmpeg user questions
> Subject: Re: [FFmpeg-user] Misson, impossible?, Prescaling, a, video...
> 
> Hi Francois,
> 
> thanks for your reply.
> I also tried this but no success...
> 
> How did you do this?

The syntax I used at the time was e.g.:

ffmpeg -i input.avi -aspect 4:3 -s 640x480 -sws_flags lanczos ...

I believe the syntax of these parameters has changed by now, so just check.

> 
> Best regards,
> mcc
> 
> 
> 
> 
> Francois Visagie <francois.visagie at gmail.com> [12-10-25 08:44]:
> > > -----Original Message-----
> > > From: ffmpeg-user-bounces at ffmpeg.org [mailto:ffmpeg-user-
> > > bounces at ffmpeg.org] On Behalf Of meino.cramer at gmx.de
> > > Sent: 25 October 2012 07:23
> > > To: FFmpeg user questions
> > > Subject: [FFmpeg-user] Misson, impossible?, Prescaling, a, video...
> > >
> > > Hi,
> > >
> > > I want to play a viodeo on an embedded linux system. There is no
> > > graphics hardware acceleration but the CPU is quiet capable.
> > >
> > > The video I want to play does not have square pixels...(I think this
> > > is
> > called
> > > "anamorphic"???) and normally is scaled to have square pixels while
> > playing
> > > ... if hardware acceleration is available.
> > > If this is done on my embedded system with software scaling I count
> > > the frames while drinking coffee.... ;)
> > >
> > > What I want to do is to pre-scale the video on my PC with ffmpeg in
> > > two
> > > ways:
> > > "De-anamorphic"-scaling from non-square anamorphic pixels to square
> > > "LCD- friendly"-pixels. Then downscaling to the size of the LCD
> > > screen of my embedded system (800x480).
> > >
> > > Especially the first step gives me headaches...
> >
> > Whenever I scaled video I ended up with square pixels. What I did was
> > specify the new resolution, as well as the required Display Aspect
Ratio.
> > Hope this helps?
> >
> > >
> > > How can I do this?
> > >
> > > Thank you very much in advance for any help!
> > >
> > > Best regards,
> > > mcc
> > >
> > >
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> 
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