[FFmpeg-devel] [PATCH 0/3] Patch set to delay output live stream

[Tao Zhang]

Andreas Rheinhardt <andreas.rheinhardt at gmail.com> 于2020年4月30日周四 下午4:23写道：
>
> Tao Zhang:
> > Marton Balint <cus at passwd.hu> 于2020年4月30日周四 下午3:26写道：
> >>
> >>
> >>
> >> On Thu, 30 Apr 2020, Tao Zhang wrote:
> >>
> >>> Marton Balint <cus at passwd.hu> 于2020年4月30日周四 上午4:55写道：
> >>>>
> >>>>
> >>>>
> >>>> On Thu, 30 Apr 2020, Tao Zhang wrote:
> >>>>
> >>>>> Marton Balint <cus at passwd.hu> 于2020年4月30日周四 上午12:03写道：
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> On Wed, 29 Apr 2020, leozhang wrote:
> >>>>>>
> >>>>>>> In some applications, it is required to add delay to live streaming.
> >>>>>>
> >>>>>> In what applications? And if you do this, why not run
> >>>>>>
> >>>>>> sleep 20; ffmpeg ....
> >>>>> In live streaming applications, someone wouldn't want broadcast what's
> >>>>> comming next immediately.
> >>>>> Sleep 20 then ffmpeg is not ok, because the stream is still
> >>>>> broadcasting immediately, and lost 20 seconds signal.
> >>>>
> >>>> So you want to buffer 20 seconds of input, and then start the output?
> >>> yes
> >>
> >> Then your timing based approach is not the best way to do that. What you
> >> want is a buffer fullness based approach. E.g. somewhere in the chain of
> >> ffmpeg components you want to have a fixed buffer size of 20 seconds of
> >> data, which is always kept filled.
> > I don't think bitstream filter can have a buffer which is always
> > filled with 20 seconds data, because bitstream filter don't handle
> > timestamp or time base.
> > Feel free to point out if I have wrong understanding about bitstream filter.
>
> Indeed you have. Your understanding seems to be based on the old
> bitstream filter API, the one before
> 33d18982fa03feb061c8f744a4f0a9175c1f63ab (from November 2013).
Learned it.
One question I met is the actual muxer (not fifo proxy muxer)
write_header function should be called after the delay, seems that I
can not achieve it by the bitstream filter in a clean way.
>
> - Andreas
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