[FFmpeg-devel] avfilter/adelay - interactive commands

[Paul B Mahol]

On Tue, Jan 18, 2022 at 6:58 PM deiwo deiwo <deiwo101 at gmail.com> wrote:

> Yes, I am aware of that fact. The changes are more proof of concept than
> anything else.
> What is missing is also proper command parsing, because the numbers can
> have suffixes defining their resolution as is in the config_input()
> function, where for each channel a different delay can be specified.
> In that case the given functionality can be taken out to separate function
> to be used by the config_input() and by the process_command().
> I can implement the missing pieces if you decide to move forward with these
> changes.
>

If patch is good, and filter does not crash it will be applied..


>
> ut 18. 1. 2022 o 18:38 Paul B Mahol <onemda at gmail.com> napísal(a):
>
> > On Tue, Jan 18, 2022 at 6:10 PM deiwo deiwo <deiwo101 at gmail.com> wrote:
> >
> > > Hi,
> > > I have created a proof of concept. Please check if it makes sense and
> > has a
> > > potential to get merged.
> > > I did not know whether it would make sense to send it as a patch, so
> for
> > > now a pastebin link:
> > > https://pastebin.com/nAxRj4C9
> >
> >
> > Delays can be different for each channel.
> >
> >
> >
> > >
> > >
> > > Thanks,
> > > David Lacko
> > >
> > > ut 18. 1. 2022 o 10:09 deiwo deiwo <deiwo101 at gmail.com> napísal(a):
> > >
> > > > Similar to how one can change volume in the volume filter when there
> > is a
> > > > zeromq filter preceding the volume filter, then it's possible to send
> > > > zeromq commands to the volume filter and change the volume
> dynamically
> > > > (while the ffmpeg is running).
> > > > In the case of adelay filter the delay could be changed dynamically,
> > when
> > > > the user would increase the delay, additional silence would be added
> > and
> > > > the sample buffer would increase, and when the user would decrease
> the
> > > > delay some samples would be skipped in the sample buffer and the
> buffer
> > > > size would decrease.
> > > >
> > > > The usage for this would be beneficial for live streams, for example
> > when
> > > > changing the delay of an audio channel requires complete restart of
> the
> > > > ffmpeg.
> > > >
> > > > ut 18. 1. 2022 o 9:22 Paul B Mahol <onemda at gmail.com> napísal(a):
> > > >
> > > >> On Mon, Jan 17, 2022 at 11:02 PM deiwo deiwo <deiwo101 at gmail.com>
> > > wrote:
> > > >>
> > > >> > Hello,
> > > >> > I would like to ask if it makes sense to implement ZeroMQ
> > interactive
> > > >> > commands for the adelay filter, from the performance and memory
> > point
> > > of
> > > >> > view.
> > > >> > If it does make sense then is it possible to malloc/free/realloc
> > > memory
> > > >> > within the command processing function? Can it cause noticeable
> > delays
> > > >> in
> > > >> > the stream outputs?
> > > >> >
> > > >> > I am new to the ffmpeg development so I am sorry if this kind of
> > > >> question
> > > >> > does not belong to this mailing list.
> > > >> >
> > > >> >
> > > >> I fail to see how that would work. Please elaborate your idea.
> > > >>
> > > >>
> > > >>
> > > >> > Thanks for the response,
> > > >> > David L
> > > >> > _______________________________________________
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> > > >> >
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> > > >> >
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