[FFmpeg-user] Visualization filter colors and scale.

[Paul B Mahol]

On 9/6/19, Zsolt <dqeswn at gmail.com> wrote:
> Thanks for the reply.
>
> Paul B Mahol <onemda at gmail.com> ezt írta (időpont: 2019. szept. 6., P,
> 19:05):
>
>>
>> Very basic question, just add scale=.... after your A->V filter, do
>> not forget to use  "," as filter separator.
>>
>
>
> Perhaps, however it doesn't work:
> -filter_complex
> "[0:a]showfreqs=s=1920x1080:cmode=combined:colors=#990000|#770000,format=yuv444p[vid],scale=out_color_matrix=bt709:out_range=pc"
>
> I get a not too helpful error: "Cannot find a matching stream for unlabeled
> input pad 0 on filter Parsed_scale_2"
>

Your command is simply wrong. Read documentation carefully next time.

>
>
>> >
>> > *A different question:*
>> >
>> > I also tried the showspectrum filter. When I use fscale=log the result
>> > is
>> > quite horrible. as if it's the same linear scale only the lower
>> frequencies
>> > obscenely stretched, can this be helped?
>>
>> Try showcqt filter if you can use it.
>>
>
> Going by what screenshot and videos I saw of that, it suffers from the same
> issue.

Then use something else.


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