Media Player Doesn't work in Package

Development Programming & Scripting
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1

I want to play media after my package.

set up meida player, it’s correctly work in editor.
But It’s doesn’t work after Package.

MediaSource format is mp4.

Can you help me?

for Ex like my script,
UMediaPlayer* MyMedia = NewObject();
UMediaTexture* MyMediaTexture = NewObject();

UFileMediaSource* MyFileMediaSource = Cast(StaticLoadObject(UFileMediaSource::StaticClass(), NULL, *MediaPath));

…

MyMedia->OnMediaOpened.AddDynamic(this, &UMyClass::OnMediaOpened);
MyMedia->OpenSource(MyFileMediaSource);

…
OnMediaOpened
…

Get Object’s Material & UMaterialInstanceDynamic::Create(…);

Mat->SetTextureParameterValue(“MediaTextureParam”, MyMediaTexture);

MyMediaTexture->SetMediaPlayer(MyMedia);