Nostrum.Voice.send_frames

You're seeing just the function send_frames, go back to Nostrum.Voice module for more information.
Link to this function

send_frames(guild_id, frames)

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Specs

send_frames(Nostrum.Struct.Guild.id(), [binary()]) :: :ok | {:error, String.t()}

Low-level. Send pre-encoded audio packets directly.

Speaking should be set to true via Nostrum.Voice.set_is_speaking/2 before sending frames.

Opus frames will be encrypted and prefixed with the appropriate RTP header and sent immediately. The length of frames depends on how often you wish to send a sequence of frames. A single frame contains 20ms of audio. Sending more than 50 frames (1 second of audio) in a single function call may result in inconsistent playback rates.

Nostrum.Voice.playing?/1 will not return accurate values when using send_frames/2 instead of Nostrum.Voice.play/4