[FFmpeg-user] Why histogram filter mode levels cannot use h|vstack filter inputed rgb(a) source?

[nicolab]

>Hi,
>
>On Thu, Oct 01, 2015 at 05:42:41 -0700, nicolab wrote:
>> I am using  histogram <https://ffmpeg.org/ffmpeg-filters.html#histogram>  
>> filter mode levels is error but color, color2 and waveform mode is OK.
>
>The mandelbrot source seems to output RGBA, but histogram does not
>support RGBA (nor any RGB, AFAICT). So inserting the format filter is
>the right thing, but perhaps using "format=gbrap" may be more lossless.
>(I admit I don't have a lot of expertise when it comes to formats.)
>
>I checked the sources to see that histogram supports gbrap (and gbrp
>and gbrp9 and ...).
>
>Moritz 

Thanks for checking sources. Command goes well using format filter in front
of histogram filter.



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