[Freeswitch-users] Record and live stream WAV to HTTP server

Tue Apr 5 21:04:47 MSD 2016

Look at http://www.unimrcp.org/ and
https://wiki.freeswitch.org/wiki/Mod_unimrcp

On Tue, Apr 5, 2016, 19:38 Vincent Gire <vincent.gire at gmail.com> wrote:

> We are building an IVR completely driven by ASR.
> ASR is performed in a distant location by a HTTP service (supporting
> chunked transfer) and adds an incompressible latency. We would like to
> stream the record to the ASR service as soon as it starts to reduce the
> overall latency before response.
> Does it make sense ?
>
>
> On Tue, Apr 5, 2016 at 5:39 PM, Michael Jerris <mike at jerris.com> wrote:
>
>> I would stay away from mod_vlc.  Its audio portions with recording have
>> known issues.  We do use the rtmp streaming in mod_av heavily but thats
>> obviously not wav.  Can you explain a bit more why you have this
>> requirement?
>>
>> On Apr 5, 2016, at 5:36 AM, Vincent Gire <vincent.gire at gmail.com> wrote:
>>
>> Ok thanks.
>> It looks promising !
>> I'll dig into mod_vlc.
>>
>> Best
>>
>> Vincent
>>
>> On Tue, Apr 5, 2016 at 10:04 AM, Sergey Safarov <s.safarov at gmail.com>
>> wrote:
>>
>>> Think is requred streaming feature of freeswitch.
>>> Look at mod_esf
>>> <https://freeswitch.org/confluence/display/FREESWITCH/mod_esf> and
>>> mod_vlc <https://wiki.freeswitch.org/wiki/Mod_vlc>
>>> Instruction to compile mod_vlc on provided link is to old but helpfull
>>> to undestand how to stream media to http server.
>>>
>>> For compiling mod_vlc please use vlc repo
>>> <https://freeswitch.org/stash/projects/SD/repos/vlc/browse> and centos
>>> instruction
>>> <https://freeswitch.org/confluence/display/FREESWITCH/Creating+RPM+repositary>
>>> .
>>> After you intall vlc, then you can enable mod_vlc module in freeswitch
>>> sources(SPEC file) and compile freeswitch.
>>>
>>> Sergey
>>>
>>>
>>> вт, 5 апр. 2016 г. в 10:31, Vincent Gire <vincent.gire at gmail.com>:
>>>
>>>> webdav, mod_http_cache or mod_httapi all results in sending the
>>>> recording only *after* it is complete.
>>>> They all write the recording to a file, wait for the recording to
>>>> complete and the file to close and then send it over HTTP.
>>>>
>>>> I would like to start sending the recording to the remove server as
>>>> soon as it starts (max 1 sec latency).
>>>> mod_http_cache or mod_httapi would be perfect if they were streaming
>>>> the recording like mod_shout.
>>>>
>>>>
>>>> On Mon, Apr 4, 2016 at 8:50 PM, Sergey Safarov <s.safarov at gmail.com>
>>>> wrote:
>>>>
>>>>> Input/output latency is not problem.  I use Kazoo on my servers and
>>>>> call recording is stored to database during 5 seconds after hangup.
>>>>> What is broken in your case if save file using webdav or http_cache?
>>>>>
>>>>> On Mon, Apr 4, 2016, 21:10 Vincent Gire <vincent.gire at gmail.com>
>>>>> wrote:
>>>>>
>>>>>> Hello Sergey,
>>>>>>
>>>>>> Thank you for your answer.
>>>>>> I've looked into webdav mounted filesystem.
>>>>>>
>>>>>> Unfortunately, most WebDav clients (especially davfs2 on debian) do a
>>>>>> lot of buffering, caching and even lock-null requests (lock a non existent
>>>>>> resource before writing to it). I also suspect that they wait for the end
>>>>>> of the write operation.
>>>>>> The result is a latency of a few seconds witch is not much better
>>>>>> than what I achieve with mod_shout if I transcode the MP3.
>>>>>>
>>>>>> Any other idea ?
>>>>>>
>>>>>> Thank you !
>>>>>>
>>>>>> Best regards
>>>>>>
>>>>>> Vincent
>>>>>>
>>>>>> On Sun, Apr 3, 2016 at 7:30 PM, Sergey Safarov <s.safarov at gmail.com>
>>>>>> wrote:
>>>>>>
>>>>>>> Please look at webdav mounted filesystem.
>>>>>>>
>>>>>>> On Sun, Apr 3, 2016, 19:17 Vincent Gire <vincent.gire at gmail.com>
>>>>>>> wrote:
>>>>>>>
>>>>>>>> Hi all,
>>>>>>>>
>>>>>>>> Thank you to all contributing to FreeSWITCH !
>>>>>>>>
>>>>>>>> I'm working on a IVR project where logic is implemented on a HTTP
>>>>>>>> server.
>>>>>>>> We are leaving Twilio because we now need to record and live stream
>>>>>>>> the session to the HTTP server in WAV format (chunked transfer encoding).
>>>>>>>>
>>>>>>>> *mod_httapi* looks great (HT TAPI very similar to Twilio's) but it
>>>>>>>> seems that the records are first saved to disk before there are sent to the
>>>>>>>> server as chunked data.
>>>>>>>> We need the transfer to start as soon as the recording starts.
>>>>>>>>
>>>>>>>> *mod_shout* does start the request almost as the records starts
>>>>>>>> but it does not support WAV file and shout:// is not exactly a HTTP request
>>>>>>>> (SOURCE method instead of PUT).
>>>>>>>>
>>>>>>>> Is there a way to use these modules to achieve our goal ?
>>>>>>>>
>>>>>>>> If not, we are willing to author a specific module or rather
>>>>>>>> contribute to the existing ones.
>>>>>>>>
>>>>>>>> We've identified two approaches:
>>>>>>>>
>>>>>>>>    1. From *mod_httapi* Modify mod_httapi to directly stream the
>>>>>>>>    record instead of completely saving it to disk before the HTTP chunked
>>>>>>>>    transfer starts.
>>>>>>>>    This seems the most logical but with more than 3000 lines,
>>>>>>>>    mod_httapi does not seem to be the easiest module to build upon for
>>>>>>>>    newcomers!
>>>>>>>>
>>>>>>>>    2. From *mod_shout*
>>>>>>>>       1. Modify libshoot to replace the custom SOURCE method with
>>>>>>>>       standard HTTP PUT method
>>>>>>>>       2. Modify mod_shout to support wav files
>>>>>>>>       3. Implement our IVR in script (javascript/lua)
>>>>>>>>
>>>>>>>> What do you think ?
>>>>>>>>
>>>>>>>> Thank you for your help.
>>>>>>>>
>>>>>>>> Cheers,
>>>>>>>>
>>>>>>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>>
>> Official FreeSWITCH Sites
>> http://www.freeswitch.org
>> http://confluence.freeswitch.org
>> http://www.cluecon.com
>>
>> FreeSWITCH-users mailing list
>> FreeSWITCH-users at lists.freeswitch.org
>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
>> http://www.freeswitch.org
>>
>
>
>
> --
> Vincent Gire
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://confluence.freeswitch.org
> http://www.cluecon.com
>
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> http://www.freeswitch.org
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.freeswitch.org/pipermail/freeswitch-users/attachments/20160405/312b644f/attachment.html 