[Freeswitch-users] Correlation between jitter/discarded_packets with choppy audio streams

[Unai Rodriguez]

Hi Dragos/All,

Yes I was able to get that from the source code however where can I find what the units of measurement are? This is mainly because we are finding discrepancies between what FS logs and what tcpdump/wireshark show.

What about the codec used? Is there any place where we can check that information?

Thank you

-- unai


On Tue, May 19, 2020, at 3:24 PM, Dragos Oancea wrote:
>  They seem self-explanatory from the code:
> 
>  apt_log(APT_LOG_MARK,APT_PRIO_INFO,"Close RTP Receiver %s:%hu <- %s:%hu [r:%u l:%u j:%u p:%u d:%u i:%u]",
>  rtp_stream->rtp_l_sockaddr->hostname,
>  rtp_stream->rtp_l_sockaddr->port,
>  rtp_stream->rtp_r_sockaddr->hostname,
>  rtp_stream->rtp_r_sockaddr->port,
>  receiver->stat.received_packets,
>  receiver->stat.lost_packets,
>  receiver->rr_stat.jitter,
>  mpf_jitter_buffer_playout_delay_get(receiver->jb),
>  receiver->stat.discarded_packets,
>  receiver->stat.ignored_packets);
> 
> The baseline depends on the codec used too.
> 
> On Mon, May 18, 2020 at 10:33 PM Unai Rodriguez <unairodcas at gmail.com> wrote:
>> Dear List,
>> 
>> We're experiencing choppy/distorted audio streams at times and have been looking into understanding the definition and units of measure of these values reported on the main FS log (i.e. /var/log/freeswitch/freeswitch.log)
>> 
>> - r = received
>> - l = lost
>> - j = jitter
>> - p = playout_delay
>> - d = discarded_packets
>> - i = ignored_packets
>> 
>> The following log lines seemed to correspond with choppy/distorted audio:
>> 
>> ========================================================
>> ...
>> 2020-05-15 10:18:05.202714 [INFO] mpf_rtp_stream.c:541 () Close RTP Receiver 10.252.148.75:18800 <- 10.252.148.73:17592 [r:403 l:0 j:651 p:0 d:87 i:0]
>> ...
>> 2020-05-15 10:25:53.622708 [INFO] mpf_rtp_stream.c:541 () Close RTP Receiver 10.252.148.75:22660 <- 10.252.148.56:18572 [r:402 l:0 j:143 p:0 d:84 i:0]
>> ...
>> 2020-05-15 10:43:42.642722 [INFO] mpf_rtp_stream.c:541 () Close RTP Receiver 10.252.148.75:18940 <- 10.252.148.72:20800 [r:356 l:0 j:838 p:0 d:79 i:0]
>> ...
>> 2020-05-15 11:00:52.102707 [INFO] mpf_rtp_stream.c:541 () Close RTP Receiver 10.252.148.75:20952 <- 10.252.148.61:16540 [r:582 l:0 j:806 p:0 d:66 i:0]
>> ...
>> ========================================================
>> 
>> At this point we believe that having a (d)iscarded value of more than 60 correlates with choppy calls and most of the time those come with (j)itter value of several hundreds.
>> 
>> Would it be possible for someone to point out where we could find the definition and unit of measure of those values (i.e.: r, l, j, p, d, i)? Is there any baseline that could be references to determine which calls are being choppy/distorted based on these numbers? We've been trying to understand FS source code and find documentation to no avail.
>> 
>> Thank you so much
>> Unai Rodriguez
>> _________________________________________________________________________
>> 
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> _________________________________________________________________________
> 
> The FreeSWITCH project is sponsored by SignalWire https://signalwire.com
> Enhance your FreeSWITCH install with disruptive priced SMS and PSTN services.
> Build your next product on our scalable cloud platform.
> 
> Join our online community to chat in real time https://signalwire.community
> 
> Professional FreeSWITCH Services
> sales at freeswitch.com
> https://freeswitch.com
> 
> Official FreeSWITCH Sites
> https://freeswitch.com/oss
> https://freeswitch.org/confluence
> https://cluecon.com
> 
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
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