[Freeswitch-dev] Freeswitch chooses the first codec and ignores the rest

[Sam Russell]

Thanks for this Anthony - I'm still on the stable branch which doesn't seem
to support this, but I'll get it upgraded to HEAD and test this & your new
patch too.

On the topic of codecs, has there been much thought given to video
transcoding? I've seen references to a "mod_ffmpeg" floating around, and
I've done a bit of transcoding work with libavcodec myself - it seems
doable, and the little bit that I've looked at the freeswitch codec
examples looks really extensible. If I were to write codecs for H264 and
VP8 (and maybe H263+ too), would they be something that you'd try to
incorporate into the main project, or would it be better to have as a
third-party mod due to the extra hassle of having to build with
libav(codec|format|util)?


On Fri, Sep 20, 2013 at 9:18 AM, Anthony Minessale <
anthony.minessale at gmail.com> wrote:

> I'd say its relatively hard.  Easier in master which is the only place it
> would be possible to do but it requires some heavy mods to the media engine
> and the rtp stack to track all the payloads and switch between them.
>
> I do think there is another workaround if you set this profile param:
>
> rtp-autofix-pt=true
>
>
> That will detect when its not the one FS thinks and it will reinit the
> codec.
>
>
>
>
>
>
>
> On Thu, Sep 19, 2013 at 4:10 PM, Sam Russell <sam.h.russell at gmail.com>wrote:
>
>> Thanks for the quick reply Anthony.
>>
>> Do you think this is a hard/easy thing to implement? I'm keen to
>> contribute a bit to freeswitch, and this is functionality that I'd like to
>> write some code for, and I can do what I like with our office PBX so I can
>> test it here too.
>>
>>
>> On Fri, Sep 20, 2013 at 8:56 AM, Anthony Minessale <
>> anthony.minessale at gmail.com> wrote:
>>
>>> We currently only support one codec in 200OK  The workaround for this is
>>> to only offer it PCMU so it has no choice.
>>>
>>>
>>>
>>> On Thu, Sep 19, 2013 at 2:52 PM, Sam Russell <sam.h.russell at gmail.com>wrote:
>>>
>>>> I've had a couple of calls recently that have been a little weird -
>>>> here's the scenario:
>>>>
>>>> A (local freeswitch) sends invite with PCMU, PCMA as codecs
>>>>
>>>> B (foreign) sends 200 OK with PCMA, PCMU as codecs
>>>>
>>>> Freeswitch sees the response and sets audio codec to PCMA, but other
>>>> end sends us PCMU (as it was our first choice in this case - sometimes
>>>> they choose a random one that both of us support).
>>>>
>>>> RTP is fine with this - each packet refers to the # of the codec
>>>> (either standard or a reference to an rtpmap from the SDP), but
>>>> freeswitch doesn't like it - it forwards the PCMA from my soft phone,
>>>> but the PCMU coming in from the foreign phone gets dropped by
>>>> freeswitch and doesn't get forwarded onto my soft phone (packet trace
>>>> shows freeswitch being the black hole).
>>>>
>>>> Debug output shows freeswitch setting the audio codec, and I suspect
>>>> this means it then only accepts RTP with that codec, instead of
>>>> handling all codecs that it offered in its invite.
>>>>
>>>> Is this expected behaviour? I went trawling through RFCs yesterday and
>>>> nothing jumped out at me, and I'm seeing this on a couple of call
>>>> managers - also sometimes the other end will send H263+ even though
>>>> both ends offered H264 as preferred, and freeswitch drops this in the
>>>> same manner. I think freeswitch should be handling all codecs that it
>>>> offers, especially for video when it only does pass through, so
>>>> spinning up instances of extra "codecs" shouldn't create much
>>>> overhead.
>>>>
>>>> Sent from my iPhone
>>>>
>>>>
>>>> _________________________________________________________________________
>>>> Professional FreeSWITCH Consulting Services:
>>>> consulting at freeswitch.org
>>>> http://www.freeswitchsolutions.com
>>>>
>>>> 
>>>> 
>>>>
>>>> Official FreeSWITCH Sites
>>>> http://www.freeswitch.org
>>>> http://wiki.freeswitch.org
>>>> http://www.cluecon.com
>>>>
>>>> FreeSWITCH-dev mailing list
>>>> FreeSWITCH-dev at lists.freeswitch.org
>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-dev
>>>> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-dev
>>>> http://www.freeswitch.org
>>>>
>>>
>>>
>>>
>>> --
>>> Anthony Minessale II
>>>
>>> FreeSWITCH http://www.freeswitch.org/
>>> ClueCon http://www.cluecon.com/
>>> Twitter: http://twitter.com/FreeSWITCH_wire
>>>
>>> AIM: anthm
>>> MSN:anthony_minessale at hotmail.com
>>> GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com
>>> IRC: irc.freenode.net #freeswitch
>>>
>>> FreeSWITCH Developer Conference
>>> sip:888 at conference.freeswitch.org
>>> googletalk:conf+888 at conference.freeswitch.org
>>> pstn:+19193869900
>>>
>>> _________________________________________________________________________
>>> Professional FreeSWITCH Consulting Services:
>>> consulting at freeswitch.org
>>> http://www.freeswitchsolutions.com
>>>
>>> 
>>> 
>>>
>>> Official FreeSWITCH Sites
>>> http://www.freeswitch.org
>>> http://wiki.freeswitch.org
>>> http://www.cluecon.com
>>>
>>> FreeSWITCH-dev mailing list
>>> FreeSWITCH-dev at lists.freeswitch.org
>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-dev
>>> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-dev
>>> http://www.freeswitch.org
>>>
>>>
>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>>
>> 
>> 
>>
>> Official FreeSWITCH Sites
>> http://www.freeswitch.org
>> http://wiki.freeswitch.org
>> http://www.cluecon.com
>>
>> FreeSWITCH-dev mailing list
>> FreeSWITCH-dev at lists.freeswitch.org
>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-dev
>> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-dev
>> http://www.freeswitch.org
>>
>>
>
>
> --
> Anthony Minessale II
>
> FreeSWITCH http://www.freeswitch.org/
> ClueCon http://www.cluecon.com/
> Twitter: http://twitter.com/FreeSWITCH_wire
>
> AIM: anthm
> MSN:anthony_minessale at hotmail.com
> GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com
> IRC: irc.freenode.net #freeswitch
>
> FreeSWITCH Developer Conference
> sip:888 at conference.freeswitch.org
> googletalk:conf+888 at conference.freeswitch.org
> pstn:+19193869900
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> 
> 
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://wiki.freeswitch.org
> http://www.cluecon.com
>
> FreeSWITCH-dev mailing list
> FreeSWITCH-dev at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-dev
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-dev
> http://www.freeswitch.org
>
>
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