[Camera] Audio is only recorded with first recording on specific iOS device (iPhone 7)

Is there an existing issue for this?

I have searched the existing issues
I have read the guide to filing a bug

Steps to reproduce

I can still reproduce this issue on iphone 7 plus with ios 15.7.8 and flutter 3.10.6 and camera package version 0.10.5+2: #30689

Expected results

It should not happen.

Actual results

It happens.

Code sample

Same as in original issue. Also reproducible with code from: https://bettercoding.dev/flutter/tutorial-video-recording-and-replay/

Screenshots or Video

Screenshots / Video demonstration

[Upload media here]

Logs

[Paste your logs here]

Flutter Doctor output

Doctor output

[✓] Flutter (Channel stable, 3.10.6, on macOS 13.5 22G74 darwin-x64)
[✓] Xcode - develop for iOS and macOS (Xcode 14.3.1)
[✓] Chrome - develop for the web
[✓] VS Code (version 1.80.1)
[✓] Connected device (3 available)
! Error: (null) needs to connect to determine its availability. Check the connection between the device and its companion iPhone, and the connection between the iPhone and Xcode. Both devices may also need
to be restarted and unlocked. (code 1)
[✓] Network resources

@misos1

Hi, @misos1. Thanks for filing this issue. Using the code sample provided here https://github.com/bettercoding-dev/flutter-video, I can't seem to produce on the latest master and stable channels and also using the camera: ^0.10.5+2 and
video_player: ^2.7.0. Can you retry on your end with the code sample to confirm this issue still reproduces?

RPReplay_Final1690802278.MP4

According to your video it seems that you used some newer iphone like 11. It is possible that this bug happens only on older devices like iphone 7.

RPReplay_Final1690813936.mov

I can reproduce this issue on my device iPhone 7, iOS 15.7.2. Verified this with plugin example code.

The issue only occurs if I keep recording with one camera. But if I switch to another camera (front or rear) between tests, the output video always contains sound.

The issue is not reproducible on Android (Realme 6, Android 11).

flutter doctor -v (stable and master)

[✓] Flutter (Channel stable, 3.10.6, on macOS 13.5 22G74 darwin-x64, locale en-VN)
    • Flutter version 3.10.6 on channel stable at /Users/huynq/Documents/GitHub/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision f468f3366c (3 weeks ago), 2023-07-12 15:19:05 -0700
    • Engine revision cdbeda788a
    • Dart version 3.0.6
    • DevTools version 2.23.1

[✓] Android toolchain - develop for Android devices (Android SDK version 32.0.0)
    • Android SDK at /Users/huynq/Library/Android/sdk
    • Platform android-33, build-tools 32.0.0
    • ANDROID_HOME = /Users/huynq/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b802.4-9586694)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 15.0)
    • Xcode at /Applications/Xcode-beta.app/Contents/Developer
    • Build 15A5195m
    • CocoaPods version 1.11.3

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2022.2)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b802.4-9586694)

[✓] VS Code (version 1.80.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.68.0

[✓] Connected device (2 available)
    • macOS (desktop) • macos  • darwin-x64     • macOS 13.5 22G74 darwin-x64
    • Chrome (web)    • chrome • web-javascript • Google Chrome 115.0.5790.114

[✓] Network resources
    • All expected network resources are available.

• No issues found!

[!] Flutter (Channel master, 3.13.0-15.0.pre.13, on macOS 13.5 22G74 darwin-x64, locale en-VN)
    • Flutter version 3.13.0-15.0.pre.13 on channel master at /Users/huynq/Documents/GitHub/flutter_master
    ! Warning: `flutter` on your path resolves to /Users/huynq/Documents/GitHub/flutter/bin/flutter, which is not inside your current Flutter SDK checkout at
      /Users/huynq/Documents/GitHub/flutter_master. Consider adding /Users/huynq/Documents/GitHub/flutter_master/bin to the front of your path.
    ! Warning: `dart` on your path resolves to /Users/huynq/Documents/GitHub/flutter/bin/dart, which is not inside your current Flutter SDK checkout at
      /Users/huynq/Documents/GitHub/flutter_master. Consider adding /Users/huynq/Documents/GitHub/flutter_master/bin to the front of your path.
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision c851efaa3a (5 hours ago), 2023-07-31 22:40:26 -0400
    • Engine revision 791f505c8c
    • Dart version 3.2.0 (build 3.2.0-16.0.dev)
    • DevTools version 2.25.0
    • If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to perform update checks and upgrades.

[✓] Android toolchain - develop for Android devices (Android SDK version 32.0.0)
    • Android SDK at /Users/huynq/Library/Android/sdk
    • Platform android-33, build-tools 32.0.0
    • ANDROID_HOME = /Users/huynq/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b802.4-9586694)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 15.0)
    • Xcode at /Applications/Xcode-beta.app/Contents/Developer
    • Build 15A5195m
    • CocoaPods version 1.11.3

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2022.2)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b802.4-9586694)

[✓] VS Code (version 1.80.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.68.0

[✓] Connected device (3 available)
    • RMX2001 (mobile) • EUYTFEUSQSRGDA6D • android-arm64  • Android 11 (API 30)
    • macOS (desktop)  • macos            • darwin-x64     • macOS 13.5 22G74 darwin-x64
    • Chrome (web)     • chrome           • web-javascript • Google Chrome 115.0.5790.114

[✓] Network resources
    • All expected network resources are available.

! Doctor found issues in 1 category.

This is caused by interference between camera_avfoundation and video_player_avfoundation. Both use same application shared AVAudioSession. Implicitly in camera_avfoundation because AVCaptureSession.usesApplicationAudioSession defaults to true and also AVCaptureSession.automaticallyConfiguresApplicationAudioSession defaults to true and seems capture session in such case is setting AVAudioSession.category to AVAudioSessionCategoryPlayAndRecord and video_player_avfoundation sets this explicitly to AVAudioSessionCategoryPlayback:
https://github.com/flutter/packages/blob/354af05222810a79ffc59201fddebc367a911d87/packages/video_player/video_player_avfoundation/ios/Classes/FLTVideoPlayerPlugin.m#L596

Note this "per-instance" state which is actually global state, multiple video player controllers will share this across app:
https://github.com/flutter/packages/blob/354af05222810a79ffc59201fddebc367a911d87/packages/video_player/video_player_avfoundation/ios/Classes/FLTVideoPlayerPlugin.m#L706-L710

I think it would not be good idea to use separate AVAudioSession for recording as this could cause interruptions as is stated in:
https://developer.apple.com/documentation/avfoundation/avcapturesession/1620490-usesapplicationaudiosession?language=objc
Do not mess with global settings in plugins like video_player or camera. What would happen if I used yet another plugin which sets yet another audio category? Maybe better would be to have a separate plugin for that and the user will be required to set up a proper audio session category so that camera and video_player work properly like there are permission requirements already now. (This could be even done automatically where each plugin could hint its category and for example when both playback and record is required then will be selected PlayAndRecord.)
Audio can be fixed and restored by removing and re-adding audioInput into _audioCaptureSession. This will also restore the category to PlayAndRecord. Problem is how to detect that there is no audio. For example it could be done after change to AVAudioSession.category but this is not even KVO compliant. The only working method of detection which I came with is really ugly. It looks at audio input sample buffer bytes and if all bytes are zero then it means we have no audio.

I think the best would be 2 and maybe this is applicable also to android. Video player would work also without setting AVAudioSessionCategoryPlayback it will just not play audio when the phone is in silent mode (which can be actually more appropriate for some apps). But somehow video cannot be recorded on older iPhones when it is not set to AVAudioSessionCategoryPlayAndRecord (or possibly AVAudioSessionCategoryRecord) and on newer iPhones it probably works with any category. So probably would be the best to have a dedicated plugin/package that lets users set audio category, options and modes as is most appropriate for specific apps.

Any other ideas?

For now I would suggest to not set category AVAudioSessionCategoryPlayback in L596 if it is already PlayAndRecord or Playback. And use already set category in L706-L710. That should fix this issue.

Is there a workaround for this? I'm trying to film multiple videos one after the other and only the first one has sound.

@kaciula

@kaciula You can try to do something like VideoPlayerController.file(File(""))..initialize()..dispose() before initializing camera so player will not later overwrite category set by camera.

Also as camera_avfoundation does not set automaticallyConfiguresApplicationAudioSession to false, it automatically overwrites what was set by the mixWithOthers option of VideoPlayerOptions.

[video_player_avfoundation, camera_avfoundation] never overwrite but …

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.

[video_player_avfoundation, camera_avfoundation] never overwrite but …

Navigation Menu

Repository navigation

[Camera] Audio is only recorded with first recording on specific iOS device (iPhone 7) #131553

Is there an existing issue for this?

Steps to reproduce

Expected results

Actual results

Code sample

Screenshots or Video

Logs

Flutter Doctor output

2 remaining items

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

[Camera] Audio is only recorded with first recording on specific iOS device (iPhone 7) #131553

Description

Is there an existing issue for this?

Steps to reproduce

Expected results

Actual results

Code sample

Screenshots or Video

Logs

Flutter Doctor output

Activity

dam-ease commented on Jul 31, 2023

misos1 commented on Jul 31, 2023

huycozy commented on Aug 1, 2023

2 remaining items

misos1 commented on Aug 22, 2023

misos1 commented on Aug 22, 2023

kaciula commented on Jan 21, 2024

misos1 commented on Jul 8, 2024

misos1 commented on Jul 13, 2024

github-actions commented on Jan 27, 2025

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions