--audio-filter volume

[Damundai]

While using the "example" in the NVEncC_Options.en.md, I recieve an error.

I use:
--audio-filter 2?volume=-4db (I've tried going to the positive side of volume as well... "volume=+2.7db")

I get the error:
avout: Failed to parse filter description: Invalid argument: "volume=-4db": volume=-4db,aformat=sample_fmts=fltp:sample_rates=48000:channel_layouts=0x3
failed to initialize file reader(s).
Failed to open output file: "D:\Completed Movies\ movie title here.mkv"
[Parsed_volume_0 @ 000002305e1ac440] [Eval @ 0000003d01913250] Invalid chars 'b' at the end of expression '-4db'
[Parsed_volume_0 @ 000002305e1ac440] Error when evaluating the volume expression '-4db'
[AVFilterGraph @ 000002305e66d3c0] Error initializing filter 'volume' with args '-4db'

[babiulep]

I think the 'b' should be a capital... I.e.: volume=7dB

[rigaya]

Thanks you for pointing out the cause, changed 'b' to capital in the document.