[Bug] MediaElement Crash - System.ArgumentException 'An item with the same key has already been added. Key: Xamarin.Forms.BindableProperty'

[JohnBurke4]

Description

The MediaElement on android occasionally crashes with a System.ArgumentException.

This seems to occur very randomly and rarely when you change the source of a MediaElement from the code behind.

I've only found this to occur on Android and not iOS.

Stack Trace

System.ArgumentException: 'An item with the same key has already been added. Key: Xamarin.Forms.BindableProperty'

[MediaPlayerNative] info/warning (3, 0) System.ArgumentException: 'An item with the same key has already been added. Key: Xamarin.Forms.BindableProperty'

[mono-rt] [ERROR] FATAL UNHANDLED EXCEPTION: System.ArgumentException: An item with the same key has already been added. Key: Xamarin.Forms.BindableProperty [mono-rt] at System.Collections.Generic.Dictionary2[TKey,TValue].TryInsert (TKey key, TValue value, System.Collections.Generic.InsertionBehavior behavior) [0x0015a] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corefx/src/Common/src/CoreLib/System/Collections/Generic/Dictionary.cs:572 [mono-rt] at System.Collections.Generic.Dictionary2[TKey,TValue].Add (TKey key, TValue value) [0x00000] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corefx/src/Common/src/CoreLib/System/Collections/Generic/Dictionary.cs:240 [mono-rt] at Xamarin.Forms.BindableObject.CreateAndAddContext (Xamarin.Forms.BindableProperty property) [0x00041] in D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:564 [mono-rt] at Xamarin.Forms.BindableObject.GetOrCreateContext (Xamarin.Forms.BindableProperty property) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:572 [mono-rt] at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty property, System.Object value, Xamarin.Forms.Internals.SetValueFlags attributes, Xamarin.Forms.BindableObject+SetValuePrivateFlags privateAttributes) [0x000d2] in D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:420 [mono-rt] at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value, System.Boolean fromStyle, System.Boolean checkAccess) [0x0004d] in D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:374 [mono-rt] at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\BindableObject.cs:349 [mono-rt] at Xamarin.CommunityToolkit.UI.Views.MediaElement.Xamarin.CommunityToolkit.UI.Views.IMediaElementController.set_Duration (System.Nullable`1[T] value) [0x00000] in <964de25b16794d918e4c00220cf2f406>:0 [mono-rt] at Xamarin.CommunityToolkit.UI.Views.MediaElementRenderer.MetadataRetrieved (System.Object sender, System.EventArgs e) [0x00022] in <964de25b16794d918e4c00220cf2f406>:0 [mono-rt] at (wrapper delegate-invoke) <Module>.invoke_void_object_EventArgs(object,System.EventArgs) [mono-rt] at Xamarin.CommunityToolkit.UI.Views.FormsVideoView+<>c__DisplayClass4_0.<SetVideoPath>b__0 () [0x00031] in <964de25b16794d918e4c00220cf2f406>:0 [mono-rt] at System.Threading.Tasks.Task.InnerInvoke () [0x0000f] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2476 [mono-rt] at System.Threading.Tasks.Task.Execute () [0x00000] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2319 [mono-rt] --- End of stack trace from previous location where exception was thrown --- [mono-rt] [mono-rt] at Xamarin.CommunityToolkit.UI.Views.FormsVideoView.SetVideoPath (System.String path) [0x000b2] in <964de25b16794d918e4c00220cf2f406>:0 [mono-rt] at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.65(intptr,intptr) [mono-rt] at (wrapper native-to-managed) Android.Runtime.DynamicMethodNameCounter.65(intptr,intptr) [BpBinder] onLastStrongRef automatically unlinking death recipients:

Link to Reproduction Sample

Steps to Reproduce

1. Change MediaElement Source in the code or viewModel.
2. View the MediaElement

Expected Behavior

Changing the MediaElement's source displays the new video and runs as normal.

Actual Behavior

Changing the MediaElement's source causes app to crash.

Basic Information

• Version with issue: Toolkit 1.3.0 pre2 and Xamarin Forms 5.0.0.2125
• Platform Target Frameworks:
  • iOS: N/A
  • Android: 11
• Android Support Library Version: N/A
• Nuget Packages:
• Affected Devices: Pixel 4a 5g

Workaround

I've found no workaround for this issue.

[willtam]

I have the exact same issue, also happened randomly from time to time. After the app crashed, the video will play fine without any issue.

Xamarin Forms 5.0.0.2125 Xamarin CommunityToolkit 1.3.0-pre2 Android 10

[TryToNotWorkAround]

Hi, did you find a solution ? I have the exact same issue. I created a custom MediaElement with a MediaSource.FromFile directly dowloaded in app ressources, but also happened from time to time. I observed that the problem happened maybe once every ten attempts. And it's happened more often on the first MediaElement initialization. But if I restart the app and open the exact same video, this issue never happen the following time. It is very anoying/frustrating... All the rest of my code is really clear, I spent a lot of time to detect why. No way to find a workaround process.

Xamarin Forms 5.0.0.2244 Xamarin CommunityToolkit 1.3.1 Android 11

[bijington]

@TryToNotWorkAround there really is no value added by using that language. It would have taken less effort to delete the statement than apologise for making it.

[TryToNotWorkAround]

@bijington sorry you're right. It's okay, frustration is my own concern... Is this a recurring issue ? That's the only topic I found about it. I found another line of thinking through testing. If there is a delay between providing a media source in the code behind and initializing MediaElement, the application often crashes. Otherwise, there is a one in ten chance.

[csaitta]

This issue is still occurring. Is there a prescribed fix for it? I tried delaying the loading of the control until I knew where the media will be located, but it's still randomly occurring.

[JoacimWall]

Hi get this also.

Android: 12 Android Build: SKQ1.211006.001 Manufacturer: Xiaomi Model: M2101K9G CrashReporter Key: 1dfdb51d-bb1d-4af1-90ec-cc03c10f9877 Start Date: 2023-01-18T18:50:19.059Z Date: 2023-01-18T18:50:21.435Z

Xamarin Exception Stack: System.ArgumentException: An item with the same key has already been added. Key: Xamarin.Forms.BindableProperty at System.Collections.Generic.Dictionary2[TKey,TValue].TryInsert (TKey key, TValue value, System.Collections.Generic.InsertionBehavior behavior) [0x0015a] in <97c6c40360454c158c014ee803ea6785>:0 at System.Collections.Generic.Dictionary2[TKey,TValue].Add (TKey key, TValue value) [0x00000] in <97c6c40360454c158c014ee803ea6785>:0 at Xamarin.Forms.BindableObject.SetValueCore (Xamarin.Forms.BindableProperty property, System.Object value, Xamarin.Forms.Internals.SetValueFlags attributes, Xamarin.Forms.BindableObject+SetValuePrivateFlags privateAttributes) [0x000d2] in <1693287603d24707b07b71d38f4122f3>:0 at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value, System.Boolean fromStyle, System.Boolean checkAccess) [0x0004d] in <1693287603d24707b07b71d38f4122f3>:0 at Xamarin.Forms.BindableObject.SetValue (Xamarin.Forms.BindableProperty property, System.Object value) [0x00000] in <1693287603d24707b07b71d38f4122f3>:0 at Xamarin.CommunityToolkit.UI.Views.MediaElement.Xamarin.CommunityToolkit.UI.Views.IMediaElementController.set_Duration (System.Nullable`1[T] value) [0x00000] in <0a68dce273b64a29949c8b1d7ab84eee>:0 at Xamarin.CommunityToolkit.UI.Views.MediaElementRenderer.MetadataRetrieved (System.Object sender, System.EventArgs e) [0x00022] in <0a68dce273b64a29949c8b1d7ab84eee>:0 at Xamarin.CommunityToolkit.UI.Views.FormsVideoView+<>c__DisplayClass4_0.<SetVideoPath>b__0 () [0x00031] in <0a68dce273b64a29949c8b1d7ab84eee>:0 at System.Threading.Tasks.Task.InnerInvoke () [0x0000f] in <97c6c40360454c158c014ee803ea6785>:0 at System.Threading.Tasks.Task.Execute () [0x00000] in <97c6c40360454c158c014ee803ea6785>:0 at null.null at Xamarin.CommunityToolkit.UI.Views.FormsVideoView.SetVideoPath (System.String path) [0x000b2] in <0a68dce273b64a29949c8b1d7ab84eee>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.<ThrowAsync>b__7_0 (System.Object state) [0x00000] in <97c6c40360454c158c014ee803ea6785>:0 at Android.App.SyncContext+<>c__DisplayClass2_0.<Post>b__0 () [0x00000] in <7685f94735ec4635bcf7c23732e3db0f>:0 at Java.Lang.Thread+RunnableImplementor.Run () [0x00008] in <7685f94735ec4635bcf7c23732e3db0f>:0 at Java.Lang.IRunnableInvoker.n_Run (System.IntPtr jnienv, System.IntPtr native__this) [0x00008] in <7685f94735ec4635bcf7c23732e3db0f>:0 at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PP_V (_JniMarshal_PP_V callback, System.IntPtr jnienv, System.IntPtr klazz) [0x00005] in <7685f94735ec4635bcf7c23732e3db0f>:0