On Fri, 26 Dec 2014 00:08:39 +0100 Stefano Sabatini <stefa...@gmail.com> wrote:
> On date Wednesday 2014-12-24 00:51:26 +0100, Lars Kiesow encoded:
> > Hi,
> > I had a more detailed look at this and found a way to do exactly
> > that, thanks for the hint.
> > [...]
>
> > One question left is, if there is any interest in having a script
> > to to the waveform generation in the tools section. Otherwise I
> > would just add my findings to the ffmpeg wiki.
>
> Sure, having this on the wiki would be nice, also I'm interested at
> looking at the script, please share.
Hi Stefano,
the basic idea is to generate a specific output format that gnuplot
understands and pipe the output into gnuplot:
ffmpeg -i in.mp3 -ac 1 -c:a pcm_s16le -f data - | gnuplot -p -e \
"plot '-' binary filetype=bin format='%int16' endian=little
array=1:0 with lines;"
That's faster and probably more reliable than parsing the output from
the patch I submitted earlier. It's a bit more problematic to plot
multiple audio channels though, as you cannot extract the data from a
single pipe.
I've attached two short scripts to this mail and will add a sections to
the wiki if Cléments patch won't make it in ... I hope it will.
–Lars
generate-waveform-ac1
Description: Binary data
generate-waveform-ac2
Description: Binary data
_______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
