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blog@hegars thanks for all the fish
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FFMPEG Generate Quindar tones

hegarsAug 13, 2021Aug 13, 2021

https://en.wikipedia.org/wiki/Quindar_tones

intro tone

ffmpeg -f lavfi -i "sine=frequency=2525:duration=0.25:sample_rate=8000" -ab 8k -ac 1 -codec:a pcm_mulaw intro.wav

outro tone

ffmpeg -f lavfi -i "sine=frequency=2475:duration=0.25:sample_rate=8000" -ab 8k -ac 1 -codec:a pcm_mulaw outro.wav

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