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

[Marton Balint]

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?

>>
>> 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?

>>
>> 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
>> >
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