[FFmpeg-user] gbrpf32le in filter_complex

[Paul B Mahol]

On Fri, May 9, 2025 at 7:29 PM Andrew Randrianasulu <randrianasulu at gmail.com>
wrote:

> пт, 9 мая 2025 г., 22:24 Mark Filipak <markfilipak.imdb at gmail.com>:
>
> > On 09/05/2025 15.05, Andrew Randrianasulu wrote:
> > > пт, 9 мая 2025 г., 21:50 Mark Filipak <markfilipak.imdb at gmail.com>:
> > >
> > >> I make two statements below regarding the core of the filter_complex.
> > >> I'd be grateful if you'd point out statements that are wrong.
> > >> (Of course, anything more you'd like to contribute is welcome, too.)
> > >>
> > >> In the core of filter_complex, pixel format is always gbrpf32le.
> > >
> > > I do not think this is true ... at least in cinelerra-gg  many ffmpeg
> > > filters run as 8bpc, on my fx 4300 (in 32 bit mode)  difference between
> > > 8bpc and 32fp surely very noticeable.
> >
> > Thank you, Andrew. Two more statements for you to confirm or refute.
> >
>
>
> I think Paul is much more authoritative source on this ;)
>
> But again, even if I run ffmpeg cli with loglevel =verbose it does not show
> conversion from/to floating-points formats, at least for common video
> inputs and outputs.
>

Yes, debug flag will show what filters have been autoinserted, and
sometimes but not always what filter input and output have picked which
pixel format.
There is patch on devel that will show much more info but its not yet
pushed to main branch.

But you can currently visually read such info if you insert (a)graphmonitor
filters inside filtergraph - it will print used format for each filter
input and output link/pad, eg which format enters input and which format
exits output of a filter.
There is even options to control which data to show at each output frame.


>
>
>
>
> > FFmpeg's picture pipeline is always gbrpf32le.
> >
> > Pictures are always converted from gbrpf32le to other formats for filters
> > that don't support gbrpf32le.
> >
> > Thanks! -- Mark.
> >
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