[FFmpeg-user] High audio latency (although low with ffplay!)

[Arif Driessen]

Hi Paul OMG! buffer_size is a hidden parameter!!

I have looked all over (the ffmpeg documentation and beyond) for some kind
of setting that would appear to do this, because the documentation does not
list it as an option: https://ffmpeg.org/ffmpeg-devices.html#pulse

Because of your prompt I decided to try it anyway. And it worked!

We need to update the documentation. I had a quick look in the github repo,
it's not very obvious where the documentation for pulse lives.


On Thu, Sep 9, 2021 at 8:23 AM Paul B Mahol <onemda at gmail.com> wrote:

> On Wed, Sep 8, 2021 at 12:11 PM Arif Driessen <arifd86 at gmail.com> wrote:
>
> > Yes, my initial suspicion is buffer size, but it appears you can't set
> > buffer size with the alsa device.
> >
> > It looks like there may be a compile-time constant MAX_BUFFER_SIZE but I
> > don't want to have to compile ffmpeg.
> >
> > On Wed, Sep 8, 2021 at 12:01 PM Michael Koch <
> astroelectronic at t-online.de>
> > wrote:
> >
> > > Am 08.09.2021 um 11:44 schrieb Arif Driessen:
> > > > about 3 seconds latency.
> > > >
> > > > I have also experimented with these flags: -thread_queue_size,
> -fflags
> > > > nobuffer, -flags low_delay ,-strict experimental, -re, -deadline
> > realtime
> > > >
> > > > Any ideas?
> > >
> > > I had a similar problem with the "dshow" input device and solved it by
> > > setting -audio_buffer_size to a small value. However I don't know if
> > > this is applicable to your pulse or alsa devices.
> >
>
> Set buffer_size for pulse output device.
>
>
> > >
> > > Michael
> > >
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