mod_tts_commandline hangs in call flow

[Lee Vidor]

Hi

I'm currently using mod_tts_commandline with a python script to AWS text to
speech API. The flow works fine during a single call.

Event socket API -> Freeswitch dialplan -> mod_tts_commandline -> Python
script -> AWS API -> Voice file -> Freeswitch say

However when there a number of concurrent calls (even just 10 to 15) the
request to execute the python script hangs until all the calls are at the
same requesting state. As if mod_tts_commandline is waiting for something
to happen.

Dial plan:

        <extension name="tts_google">
            <condition field="destination_number" expression="^11111$">
                <action application="set" data="call_timeout=60" />
                <action application="answer"/>
                <action application="detect_silence" data="100 30 25000"/>
                <action application="speak"
data="tts_commandline|${lang}|${text}" />
                <action application="hangup"/>
            </condition>
        </extension>

tts_commandline.conf:

        <param name="command" value="/usr/bin/python
/usr/local/freeswitch/scripts/synthesize_text.py --language=${voice}
--filename=${file} --text=${text}"/>
    </settings>

Execution of python script in freeswitch logs:

2018-08-30 11:19:57.641892 [ERR] switch_ivr_play_say.c:2385
switch_ivr_detect_silence: SILENCE DETECTED
2018-08-30 11:19:57.641892 [DEBUG] switch_core_codec.c:248
sofia/external/33123456789 Restore previous codec PCMU:0.
EXECUTE sofia/external/33123456789 speak(tts_commandline|en-US|Hi, This is
a test message)
2018-08-30 11:19:57.641892 [DEBUG] switch_ivr_play_say.c:3025 OPEN TTS
tts_commandline
2018-08-30 11:19:57.641892 [DEBUG] switch_ivr_play_say.c:3035 Raw Codec
Activated
2018-08-30 11:19:57.641892 [DEBUG] mod_tts_commandline.c:160 Executing:
/usr/bin/python /usr/local/freeswitch/scripts/synthesize_text.py
--language='en-US'
--filename='/tmp/92ec5996-0dc8-4293-b5ba-465430811fed.tmp.wav' --text='Hi,
This is a test message'

"Simultaneous calls requesting mod_tts_commandline"

Log from python script: (notice it's called with a 15 second delay)  ---> *What
is causing this delay?*

2018-08-30 11:20:12,488 DEBUG Called script
2018-08-30 11:20:12,490 DEBUG Arguments
Namespace(filename='/tmp/92ec5996-0dc8-4293-b5ba-465430811fed.tmp.wav',
language='en-US', ssml=None, text='Hi, This is a test message')
2018-08-30 11:20:12,490 DEBUG synthesize_text requested

The python script executes fine and returns to freeswitch:

2018-08-30 11:20:14.541919 [DEBUG] switch_core_file.c:342 File
/tmp/c61d2034-c1b1-4f42-932f-350484553b5a.tmp.wav sample rate 24000 doesn't
match requested rate 8000
2018-08-30 11:20:14.541919 [DEBUG] switch_ivr_play_say.c:2729 Speaking
text: Hi, This is a test message

Any help or further debugging steps would be appreciated.

Thanks

Lee
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