[FFmpeg-devel] [PATCH 1/2] avutil/executor: Allowing thread_count be zero

[Steven Liu]

Nuo Mi <nuomi2021 at gmail.com> 于2024年6月18日周二 19:51写道：
>
> On Mon, Jun 17, 2024 at 5:28 PM Zhao Zhili <quinkblack at foxmail.com> wrote:
>
> >
> >
> > > On Jun 17, 2024, at 16:45, Hendrik Leppkes <h.leppkes at gmail.com> wrote:
> > >
> > > On Mon, Jun 17, 2024 at 10:03 AM Zhao Zhili <quinkblack at foxmail.com>
> > wrote:
> > >>
> > >>
> > >>
> > >>> On Jun 17, 2024, at 15:05, Anton Khirnov <anton at khirnov.net> wrote:
> > >>>
> > >>> Quoting Zhao Zhili (2024-06-17 07:19:26)
> > >>>> From: Zhao Zhili <zhilizhao at tencent.com>
> > >>>>
> > >>>> When thread_count be zero, it will be run on current thread like
> > >>>> !HAVE_THREADS.
> > >>>
> > >>> Other APIs treat zero to mean "auto".
> > >>
> > >> executor don’t detect cpu cores by itself. It’s more low level than
> > libavcodec.
> > >>
> > >> Zero thread is zero thread, literally. If we use thread_count one to
> > mean
> > >> run on current thread, how to create a single thread then?
> > >
> > > Whats the point of creating a single thread? Does the main thread ever
> > > do something else in the meantime, or does it just wait for the job
> > > anyway?
> >
> > Executor as a basic infrastructure should support such usage. The caller
> > don’t need to wait for the job to finish.
> >
> Hi Zhili,
> Thank you for the patch.
> Could you explain more about its usage?
> Why do we need to run everything in the main thread when we have pthread in
> the system?
Just control CPU resource be used by decoder, perhaps the computer is
running some other applications.
There are running more application in one computer, and the ffmpeg
decoder is need not realtime.
For example running machine learning traning some model, and use
ffmpeg transcoding vod videos,
but transcode functions is borrow machine learning's team computers :D.

>
> Thank you.
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Thanks
Steven