[FFmpeg-user] Increasing audio

Cecil Westerhof Cecil at decebal.nl
Mon Apr 3 23:25:47 EEST 2017

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.)

Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof

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