[rtmpdump] librtmp performance and high latency

[Roger Pack]

So what's the final patch here? Did it fix things?

On 1/21/15, ctetrick at satx.rr.com <ctetrick at satx.rr.com> wrote:
> That ended up being exactly what I did.
> I can also do this after connecting in ffmpeg in the open function of
> librtmp.c
>
> The issue for me is that using a tcp relay really complicates things for me.
>
> I need the option in the ffmpeg.exe file and would rather use an "official"
> build.
>
> But thanks, my original "fix" is unnecessary.
>
> ---- NhJm <nhjm449 at gmail.com> wrote:
>> You might try increasing SO_SNDBUF in RTMP_Connect0. The default send
>> buffer in Windows seems to be practically nothing (8192, I believe).
>>
>> Other workarounds do exist for this problem:
>> http://strikerx3.blogspot.com.br/2014/12/tcprelay-is-now-open-source.html
>> http://www.dest-unreach.org/socat/
>>
>> -NhJm
>>
>> On Fri, Jan 9, 2015 at 7:01 PM, <ctetrick at satx.rr.com> wrote:
>>
>> > Hi,
>> > I'm using a windows build of ffmpeg from zeranoe which uses librtmp.
>> > There is a long standing problem that I'm trying to fix.
>> >
>> > There is a case on the ffmpeg bug tracker:
>> > https://trac.ffmpeg.org/ticket/1604
>> >
>> > And a related thread on the forum:
>> >
>> > http://ffmpeg.zeranoe.com/forum/viewtopic.php?f=7&t=657&sid=276f96e2c4ff9f62a2733007f2e82e1c
>> >
>> > I've posted on both.
>> >
>> > The basic problem is that RTMP_SendPacket() writes to the socket in 128
>> > byte chunks, and when the destination server has a long RTT the stream
>> > stalls.  I've tested with a simple fix - there is code there to buffer
>> > the
>> > chuncks for HTTP, but if the buffering is enabled for all sends, the
>> > whole
>> > packet is written to the socket, and the stream works much better.
>> >
>> > I'd really like to get this or something like it into a patch. I think
>> > it
>> > may fix this problem.
>> >
>> > Anybody have any feedback on this?
>> >
>> > Thanks,
>> > Cary
>> > _______________________________________________
>> > rtmpdump mailing list
>> > rtmpdump at mplayerhq.hu
>> > https://lists.mplayerhq.hu/mailman/listinfo/rtmpdump
>> >
>
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