And just for entertainment value, here’s the WD Support response:
Thank you for contacting Western Digital Customer Service and Support. [deleted]
You can view the supported codecs and file types in the manual under Appendix (page 209): http://www.wdc.com/wdproducts/library/UM/ENG/4779-705062.pdf
From what I can see the 3gp4 is not supported so I can not guarantee it will work or not. Codecs outside the supported list are not verified, but might work… although we can not guarantee they will.
If you have any further questions, please reply to this email and we will be happy to assist you further.
Very helpful - so they can categorically state that they may, or may not, work…!
