>>624
下記のような Profile でうまく動作するかもしれない(未確認)．

Profile: MHL (278)
Enforce: no
State: HDMI Plugged
Enter: MHL (343)
Abort Existing Task
A1: Wait [ MS:0 Seconds:10 Minutes:0 Hours:0 Days:0 ]
A2: If [ %caller1 ~R profile=enter ]
A3: Launch App [ App:MX Player Data: Exclude From Recent Apps:Off Always Start New Copy:Off ]
A4: Wait [ MS:500 Seconds:1 Minutes:0 Hours:0 Days:0 ]
A5: Media Control [ Cmd:Play [Simulated Only] Simulate Media Button:On App:MX Player ]
A6: Media Volume [ Level:15 Display:Off Sound:Off ]
A7: Else
A8: Media Control [ Cmd:Pause Simulate Media Button:On App:MX Player ]
A9: Go Home [ Page:0 ]
A10: System Lock
A11: End If

Exit: MHL (343)
Enter と同じ Task を指定する

Profile の PROPERTIES の Enforce Task Order のチェックを外すのと，
Task Properties の Collision Handling を Abort Existing Task にするのを忘れずに．

上記と同じものは下記のリンクに置いたが，MX Player の Pro版じゃないので，そこは選び直しが必要．
https://taskernet.com/shares/?user=AS35m8nPobtGDXby0zCUBECIBa5qdzgZDIw0PiWUbmeIAs9w%2FRCN2iZkYFb%2FaRmmKA0ocL9z2B0%3D&;id=Profile%3AMHL