Andreas Rheinhardt <andreas.rheinha...@gmail.com> 于2020年4月30日周四 下午1:45写道： > > Tao Zhang: > > Marton Balint <c...@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 <c...@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 > >> > >>>> > >>>> I don't see how this is useful at all. > >>>> > >>>> And what is -paced? What it is used for? Isn't it the same as using > >>>> ffmpeg > >>>> -re? You really should better explain your use case. > >>> -re read the input, -paced write the output. > >> > >> But why do you want to delay every output packet? > > By default, ffmpeg will output packets as fast as possible. > > So I delay output every packet at native frame rate to simulate live stream. > > What would be the benefit of your patch for API users (i.e. users that > directly use libavformat and not ffmpeg.c)? Right now your problem seems > to be in ffmpeg.c and not in libavformat. API users can use the fifo psedo muxer directly, without implementing the similar functions by themself. > >> > >>>> > >>>> Regards, > >>>> Marton > >>>> > >>>>> For example, you can add 20 seconds to rtmp stream with below command: > >>>>> ffmpeg -i your_input_stream_address -c copy -map 0:a -map 0:v -f fifo > >>>>> -paced 1 -queue_size 6000000 > >>>>> -output_delay 20000000 -fifo_format flv > >>>>> rtmp://example.com/live/delayed_stream_name > >>>>> > >>>>> leozhang (3): > >>>>> avformat/fifo: add option to delay output > >>>>> avformat/fifo: add option to write packets in paced way > >>>>> doc/muxers: add command example how to delay output live stream > >>>>> > >>>>> doc/muxers.texi | 17 +++++++++++++++++ > >>>>> libavformat/fifo.c | 26 ++++++++++++++++++++++++++ > >>>>> 2 files changed, 43 insertions(+) > >>>>> > >>>>> -- > >>>>> 1.8.3.1 > >>>>> > > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > To unsubscribe, visit link above, or email > ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
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