> -----Original Message-----
> From: ffmpeg-devel <ffmpeg-devel-boun...@ffmpeg.org> On Behalf Of
> Soft Works
> Sent: Wednesday, October 13, 2021 9:36 AM
> To: FFmpeg development discussions and patches <ffmpeg-
> de...@ffmpeg.org>
> Subject: Re: [FFmpeg-devel] [PATCH 2/5] fftools/cmdutils: Print
> filter input/output formats in help output
>
>
>
> > -----Original Message-----
> > From: ffmpeg-devel <ffmpeg-devel-boun...@ffmpeg.org> On Behalf Of
> > Paul B Mahol
> > Sent: Wednesday, October 13, 2021 9:27 AM
> > To: FFmpeg development discussions and patches <ffmpeg-
> > de...@ffmpeg.org>
> > Subject: Re: [FFmpeg-devel] [PATCH 2/5] fftools/cmdutils: Print
> > filter input/output formats in help output
> >
> > scale, extractplanes, alphaextract, waveform, vectorscope.
>
> See the results below. Nothing is flawed. Of course there can't be an
> output in all cases, as you have pointed out correctly.
>
> But for the remaining 95% of filters, the formats output is very
> useful.
> (and correct)
I'd also like to point out that this information is currently completely
inaccessible for anybody without looking it up in the source code.
Knowing about a filter's supported formats is important for building
efficient filter chains and avoiding unexpected auto format
conversions.
I had added this output years ago and the information (which is
parsed from the help output) is an important prerequisite for our
automated filter-string-building (outside of ffmpeg).
I also use it regularly for looking up filter formats and I think
it might be useful for others as well.
Kind regards,
softworkz
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