Bluetooth Headphone Playback Notice

The Issue

Recordings may sound distorted, sped up, or have clarity issues when played through Bluetooth headphones, even though the recording file itself is perfectly fine.

Symptoms

• Audio plays too fast or too slow
• Voice sounds higher/lower pitched than normal
• Quality seems degraded or "chipmunk-like"
• Different Bluetooth devices cause different playback speeds

Your recording is fine! The issue occurs during playback, not recording.

Technical Explanation

Why This Happens

1. Clearminutes records at 48kHz (professional audio standard)
2. Bluetooth headphones use various sample rates: 8kHz, 16kHz, 24kHz, 44.1kHz, or 48kHz
3. macOS resamples audio when sending 48kHz content to Bluetooth devices
4. Resampling can fail if macOS negotiates the wrong Bluetooth codec or misidentifies the device's playback capability

Device-Specific Behavior

Different Bluetooth headphones report different capabilities:

Device Type	Typical Playback Rate	Result When Playing 48kHz
Sony WH-1000XM4	16-44.1kHz (varies)	May sound 1.5-3x faster
AirPods Pro	24kHz or 48kHz	Usually OK, but can vary
Cheap BT Headset	8-16kHz	Often sounds very fast
High-end BT (LDAC)	44.1-48kHz	Usually works correctly

Solution: Use Computer Speakers

For Accurate Review

✅ Recommended:

• Computer speakers (built-in or external)
• Wired headphones (3.5mm jack or USB)
• High-quality DAC (digital audio converter)

❌ Not recommended for reviewing:

• Bluetooth headphones
• Bluetooth speakers

Bluetooth Headphones Are Fine For

• ✅ Recording (microphone input): We handle sample rate conversion correctly
• ✅ Live monitoring during recording: macOS handles real-time audio
• ✅ General computer use: Normal audio playback
• ❌ Reviewing Clearminutes recordings: Use wired/speakers instead

Verification Steps

To confirm your recording is actually fine:

1. Play recording through computer speakers
   • If it sounds normal → Recording is good, BT playback is the issue ✅
   • If it still sounds wrong → May be a different issue ❌
2. Check file properties

   # In terminal:
   ffprobe path/to/recording/audio.mp4

   Should show: sample_rate=48000, channels=1, codec_name=aac

Why We Don't "Fix" This

This is Not a Clearminutes Bug

The issue is in macOS's Bluetooth audio stack, not in Clearminutes's recording engine.

Evidence:

• Recordings play perfectly on computer speakers
• File metadata shows correct 48kHz encoding
• Other professional audio apps have the same limitation
• Issue varies by Bluetooth device (different devices = different problems)

Workarounds

Option 1: Use Computer Speakers (Recommended)

Best: Most accurate, no resampling issues

Option 2: Transcode at Different Sample Rate

If you must use Bluetooth for playback:

ffmpeg -i audio.mp4 -ar 44100 audio_44k.mp4

Try 44.1kHz (better BT compatibility than 48kHz)

Option 3: Use High-Quality Bluetooth

Devices with LDAC or aptX HD codecs handle 48kHz better:

• Sony WH-1000XM5 (LDAC mode)
• Sennheiser Momentum 4
• Some high-end Bose models

FAQ

Will this be fixed in a future update?

This is a macOS/Bluetooth limitation, not a Clearminutes bug. We've correctly recorded at 48kHz.

Why not record at 16kHz if that's what Bluetooth uses?

• System audio is 48kHz (can't be changed)
• 48kHz is professional quality (16kHz is phone-call quality)
• Most users play back on computer speakers
• Recording at 16kHz would degrade quality for 95% of users

Does this affect recording quality?

No. Recording quality is perfect. Only playback through Bluetooth has issues.

What about AirPods?

AirPods handle 48kHz better than most BT devices, but can still have issues depending on codec negotiation, battery level, and connection quality.

Summary

• ✅ Recordings are perfect: 48kHz, high quality
• ✅ Computer playback works: Use speakers or wired headphones
• ⚠️ Bluetooth playback may sound wrong: macOS resampling issue
• ✅ Recording through BT mic works: We handle resampling correctly

Bottom line: Review your recordings through computer speakers, not Bluetooth headphones.

For more help, visit support.clearminutes.app.