Disabling synchronization in udpsink for reverse playback

[Wim Taymans]

On 09/21/2012 11:39 AM, dv wrote:
> On 2012-09-21 11:36, Wim Taymans wrote:
>> On 09/21/2012 10:45 AM, Muzzu Daniela wrote:
>>>
>>> Hi,
>>>
>>> I have a question related to the following bug (marked as INVALID),
>>> where it was proposed to disable sync in udpsink for live streams:
>>>
>>> https://bugzilla.gnome.org/show_bug.cgi?id=665435
>>>
>>> It has been replied that sync should be set to TRUE in all cases.
>>>
>>> But, what about reverse playback? The server has to send chunks in
>>> reverse order, with a non-regular increase of timestamps. Does it make
>>> sense to set sync property to FALSE in this case?
>>>
>> No, the running-time (what udpsink synchronizes to) increases
>> monotonically in all cases. There is no need to disable
>> sync on udpsink in any case.
>>
>> Wim
>>>
>>> Thanks,
>>>
>>> Daniela
>>>
>>>
>>>
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>>
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>
> I'm curious - what is the benefit of leaving sync on with udpsink? The 
> only reason I can think of is to prevent 100% CPU usage on the sender 
> side and flooding the network, but if there is something that holds 
> the sender back (for example, an alsasrc), then what other reason is 
> there?
If you have multiple sources, alsasrc and v4l2src for example, the sync 
on the udpsink would make sure that
packets with the same running-time are placed on the network at the same 
time. This makes it easier for a client to
do the initial sync on them and requires less buffering in the client.

Wim

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