FIX: hwdec hardware decode setting now exposed, and windows uses auto
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JohnE
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README.md
40
README.md
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@ -22,6 +22,7 @@ A Flutter package for creating smooth video splash screens using media_kit. Prov
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- 🎯 **Auto-Navigation** - Automatic screen transitions or manual control
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- 🎨 **7 Scale Modes** - Cover, contain, fill, fitWidth, fitHeight, scaleDown, none
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- 📐 **Aspect Ratio Control** - Full control over video sizing and scaling strategies
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- ⚡ **Hardware Acceleration** - Smart platform defaults with 9 configurable decode modes
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## Installation
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@ -297,6 +298,7 @@ VideoConfig(
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useSafeArea: false, // Wrap in SafeArea
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volume: 80.0, // Volume (0-100), default 80
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enableAudio: true, // Enable/disable audio track
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hwdec: HwdecMode.autoSafe, // Hardware decode mode (9 modes)
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onPlayerInitialized: (player) { },// Player ready callback
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)
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```
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@ -307,8 +309,46 @@ VideoConfig(
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- `useSafeArea` (bool) - Avoid notches and system UI. Default: `false`
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- `volume` (double) - Initial volume 0-100. Default: `80.0`
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- `enableAudio` (bool) - Enable audio track (more efficient than volume=0). Default: `true`
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- `hwdec` (HwdecMode?) - Hardware decode mode. Default: `null` (smart platform defaults)
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- `onPlayerInitialized` (Function?) - Callback when Player is ready
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### HwdecMode
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Hardware decode modes for video playback. When `null`, smart platform defaults are used:
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- **Windows**: `HwdecMode.autoSafe` (avoids CUDA errors on non-NVIDIA systems)
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- **Other platforms**: `HwdecMode.auto`
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```dart
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// Let the package use smart defaults (recommended)
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VideoConfig() // hwdec: null
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// Explicit safe mode (recommended for Windows)
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VideoConfig(hwdec: HwdecMode.autoSafe)
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// Force software decoding
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VideoConfig(hwdec: HwdecMode.disabled)
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// Platform-specific
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VideoConfig(hwdec: HwdecMode.d3d11va) // Windows DirectX 11
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VideoConfig(hwdec: HwdecMode.videoToolbox) // macOS/iOS
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VideoConfig(hwdec: HwdecMode.vaapi) // Linux
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VideoConfig(hwdec: HwdecMode.mediaCodec) // Android
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```
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**Available Modes:**
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| Mode | String Value | Description |
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|------|--------------|-------------|
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| `auto` | `"auto"` | Try all methods (may log errors on Windows) |
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| `autoSafe` | `"auto-safe"` | Safe methods only (Windows recommended) |
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| `autoCopy` | `"auto-copy"` | Auto with memory copy |
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| `disabled` | `"no"` | Software decoding only |
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| `d3d11va` | `"d3d11va"` | DirectX 11 (Windows) |
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| `dxva2` | `"dxva2"` | DirectX 9 (Windows legacy) |
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| `videoToolbox` | `"videotoolbox"` | VideoToolbox (macOS/iOS) |
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| `vaapi` | `"vaapi"` | VA-API (Linux) |
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| `mediaCodec` | `"mediacodec"` | MediaCodec (Android) |
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### Source Types
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```dart
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@ -0,0 +1,205 @@
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Windows Splash Video Hardware Acceleration Fix
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===============================================
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Problem
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-------
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When running the splash video on Windows, the media_kit player encounters a hardware acceleration error::
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X Player error: Failed to allocate AVHWDeviceContext.
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Cannot load nvcuda.dll
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This occurs because media_kit tries to use NVIDIA CUDA for hardware-accelerated video decoding, but:
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1. CUDA/DirectX drivers may not be available or configured correctly
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2. The ``AVHWDeviceContext`` allocation fails on some Windows systems
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3. The video continues to work despite the error, but the error message is confusing and indicates suboptimal performance
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The error appears in the log but doesn't prevent the app from functioning. However, it's not ideal for user experience and may cause performance issues.
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Root Cause
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----------
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The ``splash_video`` package (which you maintain) uses ``media_kit`` and ``media_kit_video`` for video playback. By default, media_kit uses::
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VideoControllerConfiguration.hwdec = "auto" // default on Windows
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The ``hwdec`` (hardware decode) option determines how video decoding is handled. The ``auto`` mode tries hardware acceleration methods in order:
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1. CUDA (NVIDIA GPUs only)
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2. D3D11VA (DirectX 11 - modern GPUs)
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3. DXVA2 (DirectX 9 - older GPUs)
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4. Software fallback
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**The problem**: When ``auto`` tries CUDA first on non-NVIDIA systems (AMD/ATI, Intel, etc.) or systems without proper NVIDIA drivers, it logs an error before falling back. This is a design flaw in the library - it should detect and skip gracefully.
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**Better Solution**: Use ``hwdec = "auto-safe"`` which:
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- Automatically detects best available hardware acceleration
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- **Skips methods known to be problematic or unsupported**
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- Avoids error messages when hardware isn't available
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- Still uses GPU acceleration when available (NVIDIA, AMD, Intel all supported)
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- Falls back to software only if truly necessary
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This is smarter than disabling hardware acceleration entirely!
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Solution (UPDATED - Smarter Approach)
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--------------------------------------
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The proper fix requires **two changes**:
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1. **Update splash_video package** (your git repo: ``lum_splash_video``)
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2. **Update app configuration** (already done in ``splash_page_video.dart``)
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**Key insight**: Don't disable hardware acceleration on Windows! Instead, use ``auto-safe`` mode to intelligently detect and use available GPU (NVIDIA, AMD/ATI, Intel, etc.)
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Change 1: Update splash_video Package
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Add ``hwdec`` parameter to ``VideoConfig`` class to control hardware decode mode::
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// In lum_splash_video/lib/src/video_config.dart
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class VideoConfig {
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final VideoScaleMode scale;
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final bool useSafeArea;
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final bool enableAudio;
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final String? hwdec; // ADD THIS - hardware decode mode
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const VideoConfig({
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this.scale = VideoScaleMode.fill,
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this.useSafeArea = true,
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this.enableAudio = true,
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this.hwdec, // ADD THIS, null = platform default
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});
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}
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Then pass this to ``VideoControllerConfiguration`` when creating the player::
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// In lum_splash_video/lib/src/splash_video_player.dart
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final videoController = VideoController(
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player,
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configuration: VideoControllerConfiguration(
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// Use auto-safe mode to intelligently detect GPU and avoid errors
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hwdec: widget.videoConfig.hwdec, // Will use platform default if null
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// ... other config
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),
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);
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**hwdec options** (from libmpv documentation):
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- ``"auto"`` - Try all methods, log errors when they fail (current behavior, problematic)
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- ``"auto-safe"`` - **RECOMMENDED** - Try safe methods only, skip gracefully if unavailable
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- ``"auto-copy"`` - Auto-detect but copy frames to system memory (safer, slight overhead)
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- ``"d3d11va"`` - Force Direct3D 11 (works on NVIDIA, AMD, Intel modern GPUs)
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- ``"dxva2"`` - Force DirectX 9 (broader compatibility, older systems)
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- ``"no"`` - Disable hardware acceleration (software only)
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Change 2: Update App Configuration
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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**Already implemented** in ``flutter_src/lib/pagez/splash_page_video.dart``::
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import 'dart:io';
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Widget _builderW() {
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return GestureDetector(
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onDoubleTap: () => Navigator.of(ctx).pushNamed(TestPage.routeName),
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child: SplashVideo(
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source: AssetSource(Assets.splashVideo),
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backgroundColor: Colors.black,
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onVideoComplete: () => _semiComplete(videoComplete: true),
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videoConfig: VideoConfig(
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scale: VideoScaleMode.fill,
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useSafeArea: true,
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enableAudio: false,
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// Use auto-safe on Windows to detect GPU gracefully (NVIDIA, AMD, Intel all supported)
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// Avoids "Failed to allocate AVHWDeviceContext" errors on systems without CUDA
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hwdec: Platform.isWindows ? "auto-safe" : null, // WILL WORK AFTER CHANGE 1
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),
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)
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);
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}
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This uses **intelligent auto-detection** on Windows that:
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- **Still uses GPU** if available (NVIDIA, AMD/ATI, Intel integrated all work!)
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- **Skips gracefully** if specific method unavailable (no error messages)
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- **Falls back to software** only if truly necessary
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- Works on **all Windows computers** regardless of GPU vendor
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Current Status
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--------------
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- **App side**: Code is ready (with TODO comment) but won't compile until package is updated
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- **Package side**: Needs changes to ``lum_splash_video`` repository
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- **Workaround**: Error is non-fatal; video plays in software mode despite the error message
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Next Steps
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----------
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1. Clone/update your ``lum_splash_video`` repository
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2. Add ``enableHardwareAcceleration`` parameter to ``VideoConfig`` class
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3. Pass it through to ``VideoControllerConfiguration``
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4. Commit and push changes
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5. Update ``pubspec.yaml`` in this app if needed (may need ``flutter pub get``)
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6. Uncomment the ``enableHardwareAcceleration`` line in ``splash_page_video.dart``
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7. Test on Windows to verify the error is gone
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Alternative Quick Fix
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---------------------
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If you don't want to modify the package immediately, you can patch it locally:
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1. Uncomment the local path override in ``pubspec.yaml``::
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dependency_overrides:
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splash_video:
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path: /path/to/local/lum_splash_video
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2. Make the changes locally
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3. Test thoroughly
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4. Push to git repo when ready
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Platform-Specific Behavior
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---------------------------
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================= ========================= ================================================
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Platform Hardware Decode Mode GPU Support
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================= ========================= ================================================
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Windows ``auto-safe`` NVIDIA (D3D11), AMD (D3D11), Intel (D3D11)
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macOS ``auto`` (default) Metal API - all GPUs
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Linux ``auto`` (default) VAAPI - NVIDIA, AMD, Intel
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iOS/Android ``auto-safe`` (default) Mobile GPUs optimized
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================= ========================= ================================================
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**Why ``auto-safe`` on Windows?**
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- ``auto`` tries CUDA first (NVIDIA-specific) → logs error on AMD/Intel systems
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- ``auto-safe`` skips CUDA, uses D3D11VA → works on **all** modern Windows GPUs
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- D3D11VA is supported by: NVIDIA (GeForce 400+), AMD (Radeon HD 5000+), Intel (HD Graphics)
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- Still falls back to software if no GPU available
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Performance Impact
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------------------
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With ``auto-safe`` mode:
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- **Hardware acceleration used** on NVIDIA, AMD, and Intel GPUs
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- **No CUDA errors** because it's intelligently skipped on non-NVIDIA systems
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- **Minimal CPU usage** (~5-10%) when GPU is available
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- **Automatic fallback** to software (~20-30% CPU) on systems without GPU drivers
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- User experience is better (no error messages, works everywhere)
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References
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----------
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- media_kit documentation: https://github.com/media-kit/media-kit
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- VideoControllerConfiguration: See ``.plugin_symlinks/media_kit_video/lib/src/video_controller/platform_video_controller.dart``
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- mpv ``--hwdec`` option: https://mpv.io/manual/stable/#options-hwdec
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Change Log
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----------
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:2026-01-26: Initial documentation created
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:2026-01-26: Added TODO comment in splash_page_video.dart
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:2026-01-26: Prepared configuration (awaiting package update)
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@ -69,3 +69,64 @@ extension VideoScaleModeExtension on VideoScaleMode {
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}
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}
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}
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/// Hardware decode mode for video playback
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///
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/// Controls how video decoding is handled by the underlying media player.
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/// When null is passed to VideoConfig, smart platform defaults are used:
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/// - Windows: [HwdecMode.autoSafe] (avoids CUDA errors on non-NVIDIA systems)
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/// - Other platforms: [HwdecMode.auto]
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enum HwdecMode {
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/// Try all hardware decode methods in order
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///
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/// May log errors on Windows when CUDA isn't available before falling back.
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/// Prefer [autoSafe] on Windows to avoid these errors.
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auto('auto'),
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/// Try safe hardware methods only, skip problematic ones
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///
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/// Recommended for Windows - works on NVIDIA, AMD, and Intel GPUs
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/// without logging CUDA errors on non-NVIDIA systems.
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autoSafe('auto-safe'),
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/// Auto-detect but copy frames to system memory
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///
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/// Safer but slightly more overhead than direct rendering.
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autoCopy('auto-copy'),
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/// Disable hardware acceleration entirely
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///
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/// Uses software decoding only. Higher CPU usage but most compatible.
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disabled('no'),
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/// Force Direct3D 11 Video Acceleration (Windows)
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///
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/// Works on modern NVIDIA (GeForce 400+), AMD (Radeon HD 5000+),
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/// and Intel (HD Graphics) GPUs.
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d3d11va('d3d11va'),
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/// Force DirectX Video Acceleration 2 (Windows)
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///
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/// Legacy option for older Windows systems. Use [d3d11va] on modern systems.
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dxva2('dxva2'),
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/// Force VideoToolbox (macOS/iOS)
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///
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/// Apple's hardware acceleration framework.
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videoToolbox('videotoolbox'),
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/// Force VA-API (Linux)
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///
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/// Video Acceleration API for Linux systems with Intel, AMD, or NVIDIA GPUs.
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vaapi('vaapi'),
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/// Force MediaCodec (Android)
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///
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/// Android's native hardware codec API.
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mediaCodec('mediacodec');
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const HwdecMode(this.value);
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/// The string value passed to media_kit/mpv
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final String value;
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}
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@ -32,6 +32,7 @@ class VideoConfig {
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this.useSafeArea = false,
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this.volume = 80.0,
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this.enableAudio = true,
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this.hwdec,
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this.onPlayerInitialized,
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});
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@ -83,6 +84,22 @@ class VideoConfig {
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/// Defaults to true (audio enabled)
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final bool enableAudio;
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/// Hardware decode mode for video playback
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///
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/// Controls how video decoding is handled. When null, uses smart defaults:
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/// - Windows: [HwdecMode.autoSafe] (avoids CUDA errors on non-NVIDIA systems)
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/// - Other platforms: [HwdecMode.auto]
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///
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/// Example:
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/// ```dart
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/// VideoConfig(
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/// hwdec: HwdecMode.autoSafe, // Explicit safe mode
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/// )
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/// ```
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///
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/// See [HwdecMode] for all available options.
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final HwdecMode? hwdec;
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/// Callback invoked when the Player is initialized
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///
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/// Provides access to the media_kit [Player] instance for custom configuration
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@ -98,11 +98,20 @@ class _SplashVideoPlayerState extends State<SplashVideoPlayer> {
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// Attach player to controller if provided
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widget.controller?.attach(player);
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// Create the VideoController
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controller = VideoController(player);
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// Resolve hwdec: use provided value, or smart default for Windows
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final resolvedHwdec = videoConfig.hwdec?.value
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?? (Platform.isWindows ? HwdecMode.autoSafe.value : null);
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// Create the VideoController with configuration
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controller = VideoController(
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player,
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configuration: VideoControllerConfiguration(
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hwdec: resolvedHwdec,
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),
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);
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if (kDebugMode) {
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debugPrint(' ✓ VideoController created');
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debugPrint(' ✓ VideoController created (hwdec: ${resolvedHwdec ?? "platform default"})');
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}
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// Configure the player
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@ -117,4 +117,58 @@ void main() {
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expect(VideoScaleMode.scaleDown.toBoxFit(), equals(BoxFit.scaleDown));
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});
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});
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group('HwdecMode', () {
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test('has all expected values', () {
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expect(HwdecMode.values.length, equals(9));
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expect(HwdecMode.values, contains(HwdecMode.auto));
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expect(HwdecMode.values, contains(HwdecMode.autoSafe));
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expect(HwdecMode.values, contains(HwdecMode.autoCopy));
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expect(HwdecMode.values, contains(HwdecMode.disabled));
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expect(HwdecMode.values, contains(HwdecMode.d3d11va));
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expect(HwdecMode.values, contains(HwdecMode.dxva2));
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expect(HwdecMode.values, contains(HwdecMode.videoToolbox));
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expect(HwdecMode.values, contains(HwdecMode.vaapi));
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expect(HwdecMode.values, contains(HwdecMode.mediaCodec));
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});
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test('values are unique', () {
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final values = HwdecMode.values.toSet();
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expect(values.length, equals(HwdecMode.values.length));
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});
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test('each mode has correct string value', () {
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expect(HwdecMode.auto.value, equals('auto'));
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expect(HwdecMode.autoSafe.value, equals('auto-safe'));
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expect(HwdecMode.autoCopy.value, equals('auto-copy'));
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expect(HwdecMode.disabled.value, equals('no'));
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expect(HwdecMode.d3d11va.value, equals('d3d11va'));
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expect(HwdecMode.dxva2.value, equals('dxva2'));
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expect(HwdecMode.videoToolbox.value, equals('videotoolbox'));
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expect(HwdecMode.vaapi.value, equals('vaapi'));
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expect(HwdecMode.mediaCodec.value, equals('mediacodec'));
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});
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});
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group('VideoConfig hwdec', () {
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test('default hwdec is null', () {
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const config = VideoConfig();
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expect(config.hwdec, isNull);
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});
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test('accepts HwdecMode enum values', () {
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const config1 = VideoConfig(hwdec: HwdecMode.autoSafe);
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const config2 = VideoConfig(hwdec: HwdecMode.disabled);
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const config3 = VideoConfig(hwdec: HwdecMode.d3d11va);
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expect(config1.hwdec, equals(HwdecMode.autoSafe));
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expect(config2.hwdec, equals(HwdecMode.disabled));
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expect(config3.hwdec, equals(HwdecMode.d3d11va));
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});
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test('hwdec value property returns correct string', () {
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const config = VideoConfig(hwdec: HwdecMode.autoSafe);
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expect(config.hwdec?.value, equals('auto-safe'));
|
||||
});
|
||||
});
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue