[FFmpeg-user] FFprobe scripting question

[Clément Bœsch]

On Sat, Jun 16, 2012 at 03:04:28PM +0200, Clément Bœsch wrote:
> On Sat, Jun 16, 2012 at 11:48:38AM +0930, Rodney Baker wrote:
> > On Sat, 16 Jun 2012 08:33:11 Stefano Sabatini wrote:
> > > -show_streams -print_format default=nk=1:nw=1 | sed -n 9p
> > 
> > Thanks Adam, Clement and Stefano. This produces the required result (but I 
> > still need to redirect stderr to /dev/null to get just the numeric answer that 
> > I'm looking for).
> > 
> > A slight modification to sed -n 8,9p prints both horizontal and vertical 
> > pixels which is even better. :-)
> > 
> 
> This is not reliable if we add entries.
> 
> > Now I just need to learn how to do arrays in bash (or learn another 
> > programming language other than Visual Basic) so I can do something useful 
> > with the rest of the output that I'm currently throwing away. :-)
> > 
> 
> If you're scripting with bash I would suggest something like this:
> 
> % ./ffprobe -v 0 INPUT -show_streams -of flat=s=_:h=0 | grep -E '(width|height)'
> stream_0_width=1280
> stream_0_height=720
> 
> And eval that output, so you can directly access the information with
> $stream_0_width and $stream_0_height.
> 

Complete example:

    % cat res.sh
    #!/bin/bash
    eval $(ffprobe -v 0 $1 -show_streams -of flat=s=_:h=0 | grep -E 'width|height')
    printf "${stream_0_width}x${stream_0_height}\n"

    % ./res.sh big_buck_bunny_1080p_h264.mov
    1920x1080

Note: flat output is fairly recent and you may need to upgrade your
FFmpeg.

-- 
Clément B.
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