[FFmpeg-user] Increasing audio

[William Caulfield]

On Mon, Apr 3, 2017 at 1:25 PM, Cecil Westerhof <Cecil at decebal.nl> wrote:

> On Monday  3 Apr 2017 20:58 CEST, William Caulfield wrote:
>
> > On Sat, Apr 1, 2017 at 1:21 PM, Cecil Westerhof <Cecil at decebal.nl>
> wrote:
> >
> >> I was asked to make videos during a ToastMasters contest. I had
> >> ordered a microphone for this, but sadly it did not arrive in time.
> >> So I needed to use the internal microphone from my Canon HS60 SX.
> >> Being away about ten meters from the speakers, their voices are
> >> much to soft. So I needed to pump up the audio. I did this with:
> >> ffmpeg -y -i speaker.MP4 -vcodec copy -af volume=3
> >> speakerAudioInc.MP4
> >>
> >> Is that the correct way, or is there a better way?
> >>
> > Not really an answer to your question, but speaking as an audio
> > engineer:
> >
> > The boost you want is around 2.5Khz. That's where vocals are
> > understood. 700hz up to 3.5khz is probably a good range. Avoid
> > boosting below 400hz (muddy) and above 10Khz (zingy).
> >
> > I guess I'm suggesting some sort of EQ before the volume increase.
> > Not sure how that is done in FFMPEG.
>
> That is good to know. (Know I have to find out how to do that.)
>
>
 You can get as complicated as you need to, but start with something like
this:

equalizer=f=2500:width_type=h:width=500:g=3


-- 

*William Caulfield *| *ContentBridge Systems*
Product Manager, Digital Media & Systems | www.contentbridge.tv