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

[redneb8888]

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?

Thanks
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[Paul B Mahol]

Post by redneb8888
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
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.
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[redneb8888]

Post by Paul B Mahol

Post by redneb8888
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
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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[MediaStream]

Post by redneb8888

Post by Paul B Mahol

Post by redneb8888
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
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?

Post by Paul B Mahol
No way, it is shortcoming of volumedetect. It outputs info at uninit

only.

Post by Paul B Mahol
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
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