[zeromq-dev] Using ZMQ for video multicast

Pieter Hintjens ph at imatix.com
Wed Mar 26 00:01:58 CET 2014


There's no explicit retransmissions in 0MQ, though TCP will do that
for dropped packets.

On Tue, Mar 25, 2014 at 11:48 PM, George Kumar <grgkumar4 at gmail.com> wrote:
> Hi Pieter,
>
> Does PUB-SUB do retransmissions at the TCP level ? We do not need
> retransmissions as that will impact the real time nature of our application.
> Even though pub-sub is unreliable overall, I am wondering if retransmissions
> happen to make sure a message is reliably delivered.  Having a flag that
> says "no retransmissions" will also be helpful.
>
> Thanks.
> George
>
>
> On Fri, Feb 14, 2014 at 1:40 AM, Pieter Hintjens <ph at imatix.com> wrote:
>>
>> George,
>>
>> You can probably send video to a handful of recipients over TCP, using
>> pub-sub sockets. It depends totally on the video size, compression,
>> etc. UDP multicast isn't going to help unless the recipients are on
>> the same network. Semi-reliable UDP (like UDT) might help on some
>> networks. However TCP will mostly do just fine for your case.
>>
>> -Pieter
>>
>> On Wed, Feb 12, 2014 at 1:24 AM, George Kumar <grgkumar4 at gmail.com> wrote:
>> > Hi all,
>> >
>> > Sorry if this too basic a question for most for you on the list. I have
>> > a
>> > requirement where I need to multicast video to up to 3 recipients. I am
>> > considering ZMQ PUB/SUB model. But ZMQ does not have the option of using
>> > UDP
>> > for transport. TCP is generally discouraged for real time data like
>> > video.
>> > So what do you folks think ?
>> >
>> > Appreciate your feedback.
>> > Thanks.
>> > George
>> >
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>> >
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>
>
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