We tested 4.8 just a week ago and were still having issues with media textures. The problems were more related to supersane’s comment above about size but I wouldn’t be surprised if the packaging was still a problem. I’ve been asking on the forums about the resolution but haven’t gotten a response yet:
forum post
Just replied to the forum post, and hopefully we can get you to a working point.
I’ve found the answer to this problem …well Jamie discovered so I will just quote him here:
First thing copy your movie file to
the content\movies folder in your
project. Import the file in UE4… this
will create Media Player Asset in the
editor…Open up the new Asset and in the File
or URL section reset the URL/file.
Next click on the ‘File or URL’ again
and add the file you want to play…Notice that the paths change
completely from absolute to relative
path.this will now package correctly and
play from any location.
haha guys…please put this info bit into the documentation. it took me a whole day until i found this solution…and it works! thanks for sharing the solution Robbie222!
I got the path updated to relative, but packaged videos are still a black texture. Has this worked for anyone else?
EDIT: I just tried streaming the file from my website, and that isn’t working, either. No luck with Shipping, Development, or Debugging packages. File was originally 1920x1080, but I’ve tried it with 1918x1078 (lol) to no avail as well. .wmv file
EDIT2: Works fine in 4.11.2, but not 4.12.3
doesn’t work for me either in 4.12.3
scroll down in the thread i finally find the way to fix this
hi there,
its now 2016, UE 4.12,… so a long time after the first problems occured! Is there allready a solution to it? I tried about anything but, besides the editor, it doesnt work!
hope there is light at the end of the tunnel 
best regards robert
hi there,
its now 2016, UE 4.12,… so a long time after the first problems occured! Is there allready a solution to it? I tried about anything but, besides the editor, it doesnt work!
hope there is light at the end of the tunnel
best regards robert
@Robbie222 Thank you for sharing this answer! Even in 4.13 I had to use your clever trick to get packaged movies to play. Thank you so much for sharing this!
Glad I could help