Android Question Camera2 CameraEX class Error when switching to Video

[walterf25]

Hi All, I am experimenting with the Camera and Camera2 libraries for a project here at work, i am currently experimenting with the Camera2 library, for still pictures everything works as expected, but when I switch from still mode to video mode i get the following error:

Error occurred on line: 123 (CamEx2)
java.io.IOException: prepare failed.
at android.media.MediaRecorder._prepare(Native Method)
at android.media.MediaRecorder.prepare(MediaRecorder.java:981)
at anywheresoftware.b4a.objects.Camera2.StartSession(Camera2.java:273)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.shell.Shell.runVoidMethod(Shell.java:780)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:363)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:260)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:171)
at anywheresoftware.b4a.shell.DebugResumableSub$RemoteResumableSub.resume(DebugResumableSub.java:22)
at anywheresoftware.b4a.BA.checkAndRunWaitForEvent(BA.java:245)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:137)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:171)
at anywheresoftware.b4a.keywords.Common$14.run(Common.java:1736)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6518)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

The example written by Erel crashes at the following line

Camera.StartSession(tv, PreviewSize, CaptureSize, 0, 0, True)

the whole function where that above line resides is below:

Public Sub PrepareSurfaceForVideo (MyTaskIndex As Int, Dir As String, FileName As String) As ResumableSub
    If MyTaskIndex <> TaskIndex Then Return False
    CloseSession
    Wait For (CreateSurface) Complete (Result As Boolean)
    If MyTaskIndex <> TaskIndex Then Return False
    File.Delete(Dir, FileName)
    MediaRecorder = Camera.CreateMediaRecorder(PreviewSize, Dir, FileName)
    Dim rotation As Int = jcamera.GetField("lastKnownOrientation")
    Dim SensorOrientation As Int = GetFromCameraCharacteristic("SENSOR_ORIENTATION")
    Dim orientations As List
    If SensorOrientation = 90 Then
        orientations = Array(90, 0, 270, 180)
    Else
        orientations = Array(270, 180, 90, 0)
    End If
    MediaRecorder.RunMethod("setOrientationHint", Array(orientations.Get(Floor(rotation / 90))))
    LogColor("previewsize: " & PreviewSize.Width & " -- " & PreviewSize.Height & " " & "capturesize: " & CaptureSize.Width & " -- " & CaptureSize.Height, Colors.Blue)
    Log("tv initialized: " & tv.IsInitialized)
    Camera.StartSession(tv, PreviewSize, CaptureSize, 0, 0, True)
    Wait For Camera_SessionConfigured (Success As Boolean)
    If MyTaskIndex <> TaskIndex Then Return False
    Return Success
End Sub

Any ideas as to why this is, I have also tried this example on my Samsung Galaxy S9+ running Android 9.0 and I still see the same issue, on my Galaxy i don't see an error but instead i only see a white Panel with the Camera button on it.

Any help will be very much appreciated guys.

Walter

 

[Erel]

Does it help if you add a call to Sleep(300) after the previous session ends and before the new one opens?

 

[walterf25]

Does it help if you add a call to Sleep(300) after the previous session ends and before the new one opens?

No it does not.

Walter

 

[Erel]

Worth trying with smaller preview size.