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

[redneb8888]

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.