Solution to Accents and "Ñ" for Spanish models:

[ManoleteGuitar]

Run from CMD:

piper.exe -m es_ES-davefx-medium.onnx --output_file out.wav --json-input < input.json

*Input.json file structure:
{ "text": "Tomorrow will be a good day." }

*Parsing with echo:
echo "Mañana será un buen día" | piper.exe --model .\models\es_ES-davefx-medium.onnx --output_file out.wav

-- Note:
Powershell with CAT creates problems with the UTF encoding of special characters such as accents and the "Ñ" letter .

Saludos.

[slasuc]

I have similar problem with polish "ą" letter

[synesthesiam]

Try running chcp 65001 first.

[slasuc]

Try running chcp 65001 first.

well it did not helped, however using cmder.app solved problem with diacritic symbols as mentioned in #460