🐛 Audio desync/lag after pausing recording, switching cameras, and resuming in v4.x

[ZakirBangash]

What's happening?

When pausing a video recording, switching the camera (e.g., from back to front via the device prop), and then resuming the recording, there is noticeable audio lag/desync in the final video output. The video resumes smoothly, but the audio appears delayed by 1-3 seconds (depending on device), causing misalignment between sound and visuals. This occurs consistently on physical devices and disrupts user experience for apps requiring seamless multi-camera recordings (e.g., video calls or tutorials).
This seems related to the camera session reinitialization during the switch, which may interrupt or flush audio buffers/timestamps even in a paused state. No errors are thrown in logs, but the output video plays with offset audio.

Reproduceable Code

<Camera
            ref={camRef}
            device={frontMode ? front : back}
            isActive={isFocused}
            torch={isTorchOn === true ? 'on' : 'off'}
            video={true}
            audio={true}
            focusable={true}
            format={format}
            enableZoomGesture={true}
            style={StyleSheet.absoluteFill}
          />

Relevant log output

We have Visual bug, just lags in sound

Camera Device

{
  "videoStabilizationModes": [
    "off",
    "cinematic",
    "cinematic-extended"
  ],
  "autoFocusSystem": "contrast-detection",
  "photoWidth": 3264,
  "supportsPhotoHdr": false,
  "supportsDepthCapture": false,
  "maxISO": 3918,
  "minISO": 41,
  "minFps": 15,
  "videoWidth": 1280,
  "supportsVideoHdr": true,
  "videoHeight": 720,
  "fieldOfView": 86.45470190505881,
  "maxFps": 30,
  "ph

Device

Android Pixel 7 Pro, but can be on any device

VisionCamera Version

4.7.2

Can you reproduce this issue in the VisionCamera Example app?

I didn't try (⚠️ your issue might get ignored & closed if you don't try this)

Additional information

• I am using Expo
• I have enabled Frame Processors (react-native-worklets-core)
• I have read the Troubleshooting Guide
• I agree to follow this project's Code of Conduct
• I searched for similar issues in this repository and found none.

[maintenance-hans]

Guten Tag, Hans here.

Note

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To support @mrousavy, please consider 💖 sponsoring him on GitHub 💖.
Sponsored issues will be prioritized.

[ZakirBangash]

Previously, we recorded videos by capturing the first clip, stopping the recording, switching the camera, and then recording the next clip. In the end, we merged those clips using the FFmpeg library. However, since that library has now been retired, we are trying to use this great library directly — but we are experiencing audio lag issues

[ste00martin]

Seeing this also