[Freeswitch-users] RTP timestamps jumping backwards

[Peter Olsson]

I believe that setting was the other way around in my original patch (to
use this by default). However, even if it sounds like it should be more
compliant, it caused problems with some devices - that's why it ended up
like this. It was some time ago - so I don't remember every detail though.


2014-03-28 13:39 GMT+01:00 Richard Brady <rnbrady at gmail.com>:

> Thanks Peter
>
> That's really useful. I opted for rtp-rewrite-timestamps but had missed
> that one and will try it next if I don't see an improvement. There's also
> RTP_BUG_SEND_LINEAR_TIMESTAMPS.
>
> I'm quite confident I can work around the issue but would like to make
> sure that if there is an RFC non-compliance in default FS we get it
> resolved for the benefit of others.
>
> My understanding:
>
> The marker bit makes it ok to jump the timestamp for silence suppression /
> discontinuous transmission etc.
>
> BUT the marker bit doesn't make it ok to change the timestamp SOURCE (and
> jump the timestamp backwards for example). In that case the SSRC MUST
> change too.
>
> Regards,
> Richard
>
> On 28 March 2014 11:08, Peter Olsson <peter at olssononline.se> wrote:
>
>> There is actually a setting to force new SSRC in a condition like that.
>>
>> Internally it's called RTP_BUG_CHANGE_SSRC_ON_MARKER. If I remember
>> correctly it should be set in the sofia profile config:
>>
>> <param name="auto-rtp-bugs" data="CHANGE_SSRC_ON_MARKER"/>
>>
>> Try that out and see if it helps.
>>
>> /Peter
>>
>>
>> 2014-03-28 11:37 GMT+01:00 Richard Brady <rnbrady at gmail.com>:
>>
>>>  Hi Anthony and team
>>>
>>> I have a situation where the timestamp in a RTP stream generated by FS
>>> jumps backwards. Version 1.2.22.
>>>
>>> It seems the cause of this is that media from the A leg starts late. So
>>> in the meantime we start generating media on the B leg with our own
>>> timestamp.
>>>
>>> Then media starts arriving on the A leg so we relay it and we start
>>> using that timestamp instead of our own.
>>>
>>> FS sets the marker bit when this happens but I'm not sure this makes it
>>> OK to turn back the timestamp. I think we should actually be using a new
>>> SSRC.
>>>
>>> Any thoughts? (happy to raise a Jira ticket and verify in master).
>>>
>>> Richard
>>>
>>> --
>>> Richard Brady
>>> M: +44 (0)7771 623 348
>>> T:  +44 (0)20 8144 8160
>>> E: rnbrady at gmail.com
>>>
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>>
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>
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>
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