[FFmpeg-user] showvolume filter

Nisar Ahmed nisar.med at gmail.com
Sat Apr 2 16:14:47 CEST 2016

I am using ffmpeg to capture audio/video from a decklink card and producing
2 outputs from it, one is the captured movie file on disk and the other one
is mpegts stream for monitoring. The monitoring stream should have audio
bars for audio monitoring as well.

ffmpeg -f decklink -i "DeckLink Intensity" -vcodec libx264 -acodec
libmp3lame -preset ultrafast -crf 30 output.mp4 -vf scale=640:-1 -f mpegts

It would be best if I could overlay showvolumne filter or pipe it to ffplay
or both.


On Sat, Apr 2, 2016 at 11:43 PM, Moritz Barsnick <barsnick at gmx.net> wrote:

> On Sat, Apr 02, 2016 at 22:06:41 +1100, Nisar Ahmed wrote:
> > I am trying to overlay volume bars over my mpegts output but unable to
> > figure out the command. Can someone guide me on how to add volume bars as
> > an overlay to video output in ffmpeg
> I was wondering, when your first mail came, what you mean. Could you
> elaborate what you mean with audio bars? Something like ffmpeg's
> showvolume filter?
> I can't find an example image of showvolume on the net, but you can try
> it for yourself with ffplay:
> $ ffplay -f lavfi -i 'amovie=multimediafile.ts,showvolume'
> If so, we can show you how to overlay this onto the video stream.
> Moritz
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