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

[Andreas Rheinhardt]

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).

- Andreas