Using gTTS in Node-RED with python-venv node

[404background]

Also introduced in my article below:
In English: https://404background.com/en/programming/en-python-gtts/
In Japanese: https://404background.com/program/python-gtts/

In this post, I tried using gTTS (Google Text-to-Speech) with the python-venv node in Node-RED.
Using gTTS, you can generate an audio file that speaks text.

Just follow the steps below to make it available.

1. Install gTTS with the pip node.
2. Run gtts-cli.exe using the venv-exec node.

The following flow can be used to execute gTTS.

Here is the flow:

[{"id":"3eaf61a6234b295e","type":"pip","z":"22eb2b8f4786695c","venvconfig":"36c2cf6f351fdc6e","name":"","arg":"gTTS","action":"install","tail":false,"x":630,"y":3900,"wires":[["adc2bd3e14623eac"]]},{"id":"0329d8a408d93a42","type":"inject","z":"22eb2b8f4786695c","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":480,"y":3900,"wires":[["3eaf61a6234b295e"]]},{"id":"adc2bd3e14623eac","type":"debug","z":"22eb2b8f4786695c","name":"debug 150","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":790,"y":3900,"wires":[]},{"id":"ad3e228c832881fd","type":"venv-exec","z":"22eb2b8f4786695c","name":"","venvconfig":"36c2cf6f351fdc6e","mode":"execute","executable":"gtts-cli.exe","arguments":"'hello' --output hello.mp3","x":630,"y":3960,"wires":[["d2b90b2d03a26252"]]},{"id":"faf05570b1bc51af","type":"inject","z":"22eb2b8f4786695c","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":480,"y":3960,"wires":[["ad3e228c832881fd"]]},{"id":"d2b90b2d03a26252","type":"debug","z":"22eb2b8f4786695c","name":"debug 155","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":790,"y":3960,"wires":[]},{"id":"36c2cf6f351fdc6e","type":"venv-config","venvname":"AI","version":"3.8"}]

If you pass only text, for example, you can generate an audio file of the text entered at the dashboard node.
I used template nodes to pass the arguments of the executable.

In addition, connecting to a node that plays audio, the generated audio file can be played.
Here is the flow:

[{"id":"5def8c7caba7d4da","type":"venv-exec","z":"22eb2b8f4786695c","name":"gTTS","venvconfig":"36c2cf6f351fdc6e","mode":"execute","executable":"gtts-cli.exe","arguments":"","x":860,"y":4160,"wires":[["2211e3a3be80c988"]]},{"id":"44c0cb2499027b61","type":"inject","z":"22eb2b8f4786695c","name":"","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"Hello, World!","payloadType":"str","x":450,"y":4100,"wires":[["68c9da00af3ff5d4"]]},{"id":"2211e3a3be80c988","type":"debug","z":"22eb2b8f4786695c","name":"debug 324","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":1020,"y":4160,"wires":[]},{"id":"68c9da00af3ff5d4","type":"template","z":"22eb2b8f4786695c","name":"","field":"payload","fieldType":"msg","format":"handlebars","syntax":"mustache","template":"'{{payload}}' --output voice.mp3","output":"str","x":600,"y":4100,"wires":[["e63d63cb8887f452","1b16618e69c8cb72"]]},{"id":"ed0419f2c389e0c2","type":"inject","z":"22eb2b8f4786695c","name":"","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"Nice to meet you.","payloadType":"str","x":460,"y":4180,"wires":[["68c9da00af3ff5d4"]]},{"id":"89f3ba3345fa9899","type":"template","z":"22eb2b8f4786695c","name":"","field":"payload","fieldType":"msg","format":"handlebars","syntax":"mustache","template":"'{{payload}}' --output voice_ja.mp3 --lang ja","output":"str","x":620,"y":4220,"wires":[["5def8c7caba7d4da"]]},{"id":"12d9b5c47a80a876","type":"inject","z":"22eb2b8f4786695c","name":"","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"こんにちは","payloadType":"str","x":440,"y":4220,"wires":[["89f3ba3345fa9899"]]},{"id":"7be349c8c215c65b","type":"inject","z":"22eb2b8f4786695c","name":"","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"はじめまして","payloadType":"str","x":450,"y":4260,"wires":[["89f3ba3345fa9899"]]},{"id":"e63d63cb8887f452","type":"debug","z":"22eb2b8f4786695c","name":"debug 325","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":770,"y":4060,"wires":[]},{"id":"1b16618e69c8cb72","type":"change","z":"22eb2b8f4786695c","name":"","rules":[{"t":"change","p":"payload","pt":"msg","from":"\"","fromt":"str","to":"","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":800,"y":4100,"wires":[["5def8c7caba7d4da"]]},{"id":"36c2cf6f351fdc6e","type":"venv-config","venvname":"AI","version":"3.8"}]