Media texture does not display on video in unreal 4.8

Hi! I have a problem with the media textures during recording video in matinee. Video has recorded from camera in all scene, but the media texture is not displayed. Now I use unreal 4.8.
There was a media texture I created in unreal 4.7.6. And when recording video in matinee, this media texture have speed in 2 times greater than the conventional video.
In normal playing through unreal, media texture normally displayed. The problem arises only when recording video in matinee. Who knows how to fix this problem? Thanks.

same problem