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Optimize voice note codec to 16 kHz / 20 kbps for smaller file sizes

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- Reduce sample rate from 44.1 kHz to 16 kHz (telephony standard)
- Lower bitrate from 32 kbps to 20 kbps
- Results in ~37% file size reduction (~150 KB/min vs 240 KB/min)
- Increases max voice note length from 4.4 to 7 minutes over 1 MiB BLE limit
- Maintains excellent voice quality using native AAC-LC codec
This commit is contained in:
jack
2025-10-15 17:37:19 +01:00
committed by islam
parent b25f0d9f63
commit d7ca99ae5d
1 changed files with 2 additions and 2 deletions
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bitchat/Features/voice/VoiceRecorder.swift
+2 -2
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@@ -73,9 +73,9 @@ final class VoiceRecorder: NSObject, AVAudioRecorderDelegate {
let outputURL = try makeOutputURL() let outputURL = try makeOutputURL()
let settings: [String: Any] = [ let settings: [String: Any] = [
AVFormatIDKey: kAudioFormatMPEG4AAC, AVFormatIDKey: kAudioFormatMPEG4AAC,
AVSampleRateKey: 44_100, AVSampleRateKey: 16_000,
AVNumberOfChannelsKey: 1, AVNumberOfChannelsKey: 1,
AVEncoderBitRateKey: 32_000 AVEncoderBitRateKey: 20_000
] ]
let audioRecorder = try AVAudioRecorder(url: outputURL, settings: settings) let audioRecorder = try AVAudioRecorder(url: outputURL, settings: settings)