[FFmpeg-user] [Bulk] visualising Filtergraphs

[Tim Nicholson]

On 14/09/12 09:57, Tim Nicholson wrote:
> I am trying to use graph2dot, as per
> 
> http://ffmpeg.org/ffmpeg.html#graph2dot
> 
> but failing miserably.
> For example:-
> 
>> echo "scale=iw/2:ih/2:interl=1" | \
> graph2dot -o graph.tmp && dot -Tpng graph.tmp \
> -o graph.png && display graph.png
> Input pad "default" for the filter "Parsed_scale_0" of type "scale" not
> connected to any source
> 
> I have tried adding -i infile and -vf in front, and then it complains
> about "No such filter: -vf" etc.
> 
> The actual filter string works fine in a real ffmpeg command line.
> 
> I'm obviously missing something simple, but could anyone enlighten me
> please?
> 

To answer my own post after input form elsewhere...

You need to start with "nullsrc=s=widthxheight, format= uyvy422,....."
to set up your source material parameters... the docs could be clearer
so I might submit a patch once I've sorted my main issue out.

-- 
Tim