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The Audio level is not great, how to boost it

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The Audio level is not great, how to boost it

Using the TVideoGrabber SDK with the Multipurpose Encoder installed, e.g. to increase the volume by 6dB, set:
VideoGrabber.SetFFmpegAudioFilter (0, ‘volume’, ‘6dB’);
or
VideoGrabber.SetFFmpegAudioFilter (0, ‘volume’, ‘2’);
(2 = twice as loud so approx. 6 dB)

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