https://bugs.kde.org/show_bug.cgi?id=510397

--- Comment #4 from postix <[email protected]> ---
(In reply to Bernd from comment #3)
> Hmm, according to the ffmpeg libavfilter library, the valid range for gain
> is -900 to 900.

Yes, thanks for the hint! This range has been introduced with commit [1].
It tells us, that the units of gain is dB and the description reads in [2] 
> Give the gain at 0 Hz. Its useful range is about -20
> (for a large cut) to +20 (for a large boost).

[1]
https://github.com/FFmpeg/FFmpeg/commit/b70ea49ca32cbff8be5c6f85a94600bb5fcc8ac8#diff-51c9e93e6b4afb4a0a54862509ee5bc471f4df465fe1de223dad2a6d82830a17R459

[2]
https://github.com/FFmpeg/FFmpeg/commit/b70ea49ca32cbff8be5c6f85a94600bb5fcc8ac8#diff-cb078e68911f0c4b339b9340fca008e3c3d131ac8f0ca62ba0d4950f72cb14aaR299-R393

So I think, this huge -900 ... 900 dB do not make much sense really.

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