Texture flickering issue when using external textures for video playback on iOS #174794
Description
Steps to reproduce
I encountered a texture flickering bug when using external textures for video playback on iOS platform. I've prepared a demo that consistently reproduces this issue on Flutter 3.35.1.
Steps to reproduce:
- Clone the demo repository
- Run on iOS device with Flutter 3.35.1
- Observe texture flickering (no need to click PlayAll)
Expected results
Video should play smoothly without texture flickering.
Actual results
Texture flickering occurs during video playback when using external textures.
Code sample
Code sample
Demo repository: https://github.com/qpalwo/flutter_flash_screen
Key changes: qpalwo/flutter_flash_screen@1f00260
Suspected root cause:
I suspect this issue is related to PR flutter/engine#57020. After changing keep_alive_frame_count to 0, the issue no longer reproduces.
Analysis:
Upon examining the related logic, I believe the problem may be caused by improper reuse of the RenderTargetCache during YUV to RGB conversion.
Screenshots or Video
Screenshots / Video demonstration
out.mp4
Logs
Logs
[Paste your logs here]Flutter Doctor output
Doctor output
❯ ../offical_flutter/bin/flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[!] Flutter (Channel [user-branch], 3.35.1, on macOS 15.6.1 24G90 darwin-arm64, locale zh-Hans-CN)
! Flutter version 3.35.1 on channel [user-branch] at /Users/ext/project/offical_flutter
Currently on an unknown channel. Run `flutter channel` to switch to an official channel.
If that doesn't fix the issue, reinstall Flutter by following instructions at
https://flutter.dev/setup.
! Upstream repository unknown source is not a standard remote.
Set environment variable "FLUTTER_GIT_URL" to unknown source to dismiss this error.
[!] Android toolchain - develop for Android devices (Android SDK version 35.0.1)
✗ cmdline-tools component is missing.
Try installing or updating Android Studio.
Alternatively, download the tools from https://developer.android.com/studio#command-line-tools-only
and make sure to set the ANDROID_HOME environment variable.
See https://developer.android.com/studio/command-line for more details.
✗ Android license status unknown.
Run `flutter doctor --android-licenses` to accept the SDK licenses.
See https://flutter.dev/to/macos-android-setup for more details.
[✓] Xcode - develop for iOS and macOS (Xcode 16.2)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2025.1)
[✓] VS Code (version 1.103.1)
[✓] Connected device (3 available)
[✓] Network resources
! Doctor found issues in 2 categories.