am 2a55b596: Merge "libvideoeditor: fix cannot show some thumbnails in storyboard or no frame display in PreviewRenderer surface after importing video"

* commit '2a55b5964c6ae167cc1bc57eca5ca7a1c4aa452c':
  libvideoeditor: fix cannot show some thumbnails in storyboard or no frame display in PreviewRenderer surface after importing video