[FFmpeg-user] bandpass filter question/remark

[Paul B Mahol]

On 3/5/14, Olivier Langlois <olivier at trillion01.com> wrote:
> With this filter_complex "bandpass=f=2200:width_type=h:w=2000"
>
> I get:
>
> [bandpass @ 0x8e63e30] Value 2000.000000 for parameter 'w' out of range
> [0 - 999]
>     Last message repeated 1 times
> [bandpass @ 0x8e63e30] Error setting option w to value 2000.
> [Parsed_bandpass_0 @ 0x8e66300] Error applying options to the filter.
> [AVFilterGraph @ 0x8e61b50] Error initializing filter 'bandpass' with
> args 'f=2200:width_type=h:w=2000'
>
> I want to use this filter to filter out anything that isn't voice. Am I
> unreasonnable with my filter arguments?

I set limits by pure guessing, if you think they are unreasonable feel free
to propose changes.

>
> By looking libavfilter/af_biquads.c, I have changed my arguments to
>
> "bandpass=f=2200:width_type=q:w=1.1" which is a different way to express
> the same thing and it did accept my params that way.
>
>
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