[FFmpeg-user] Capturing the output of volumedetect as JSON

[MediaStream]

On Wed, Oct 3, 2018 at 5:55 PM redneb8888 <redneb8888 at gmail.com> wrote:

> On Wed, Oct 3, 2018 at 8:36 PM Paul B Mahol <onemda at gmail.com> wrote:
> >
> > On 10/3/18, redneb8888 <redneb8888 at gmail.com> wrote:
> > > Hi *,
> > >
> > > ffprobe can nowadays produce JSON output, which is quite convenient
> > > sometimes. I am trying to use that feature in order to get the output
> > > of volumedetect as JSON. I tried the following:
> > >
> > >     ffprobe -loglevel error -of json=c=1 -show_entries root -f lavfi
> > > -i 'movie=filename=clip.mkv:streams=a,volumedetect'
> > >
> > > The "-show_entries root" means that all information should be included
> > > in the JSON output, but still I cannot find anything from volumedetect
> > > there. On the other hand, the above trick works just fine with other
> > > filters, e.g. for cropdetect you can do
> > >
> > >     ffprobe -loglevel error -of json=c=1 -show_entries frame_tags -f
> > > lavfi -i 'movie=filename=clip.mkv:streams=v,cropdetect'
> > >
> > > Is there a way to make this work? Or is this a shortcoming of
> volumedetect?
> >
> > No way, it is shortcoming of volumedetect. It outputs info at uninit
> only.
> >
> > If you are interested in peak volume only try astats filter.
>
> Thanks for the suggestion, astats does what I want.
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I'd give ebur128 a try, its pretty accurate