Re: [FFmpeg-devel] [PATCH] avfilter/fifo: Remove (a)fifo filters

[Muhammad Faiz <mfcc64@gmail.com>]

On Sat, Mar 9, 2024 at 6:11 PM Paul B Mahol <onemda@gmail.com> wrote:

> On Sat, Mar 9, 2024 at 2:09 AM Muhammad Faiz <mfcc64@gmail.com> wrote:
>
> > On Fri, Mar 8, 2024 at 10:30 PM Paul B Mahol <onemda@gmail.com> wrote:
> >
> > > On Fri, Mar 8, 2024 at 4:18 PM Muhammad Faiz <mfcc64@gmail.com> wrote:
> > >
> > > > On Fri, Mar 8, 2024 at 5:40 PM Andreas Rheinhardt <
> > > > andreas.rheinhardt@outlook.com> wrote:
> > > >
> > > > > Muhammad Faiz:
> > > > > > On Tue, Feb 6, 2024 at 3:58 PM Andreas Rheinhardt <
> > > > > > andreas.rheinhardt@outlook.com> wrote:
> > > > > >
> > > > > >> Andreas Rheinhardt:
> > > > > >>> Obsolete since 4ca1fb9d2a91757c8c4c34dd456abf340e3f765f.
> > > > > >>>
> > > > > >>> Signed-off-by: Andreas Rheinhardt <
> > andreas.rheinhardt@outlook.com>
> > > > > >>> ---
> > > > > >>>  doc/filters.texi         |   9 ---
> > > > > >>>  libavfilter/Makefile     |   1 -
> > > > > >>>  libavfilter/allfilters.c |   2 -
> > > > > >>>  libavfilter/fifo.c       | 165
> > > > ---------------------------------------
> > > > > >>>  4 files changed, 177 deletions(-)
> > > > > >>>  delete mode 100644 libavfilter/fifo.c
> > > > > >>>
> > > > > >>
> > > > > >> Will apply in a few days unless there are objections.
> > > > > >>
> > > > > >> - Andreas
> > > > > >>
> > > > > >>
> > > > > > This breaks backward compatibility.
> > > > > >
> > > > > > Please revert.
> > > > > >
> > > > > > Thank's.
> > > > >
> > > > > What breaks that can't simply be fixed by removing the (a)fifo
> filter
> > > > > from the filterchain?
> > > > >
> > > > > - Andreas
> > > > >
> > > > >
> > > > I use afifo to optimize memory usage.
> > > >
> > >
> > > That statement sync with reality is questionable, fifo filters were
> > mainly
> > > used before .activate was added,
> > > for cases filters used >1 inputs. Now they should be irrelevant, unless
> > > there are bugs in code than this filters just hide more bugs.
> > >
> >
> > Yes, I've used it before .activate was added, and it worked, and still
> > works.
> > Although maybe the bugs have been fixed by .activate, what's wrong if
> > (a)fifo still exist?
> >
>
> As already wrote, lets repeat it again, hiding real bugs. Hiding is not
> correct word,
> it just adds yet another layer in filtergraph to accumulate memory/frames,
> with extra allocations per each frame for linking between prev and next
> frame.
> Which is pointless, as libavfilter internal code already have own queue
> mechanism.
> Check for which filters used after afifo, afifo count of queued frames
> reach > 1 than
> such filters needs fixing. Personally, my mpv visualizer modified script is
> not using afifo filters, and it works fine.
>
>
OK

Thank's
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