My understanding is that this is an issue that many newer ICS devices no longer have support for "Mass Storage mode" which is what you're referring to when you say "mount." The S3 uses what's called MTP which is music transfer protocol. It IMO sucks by comparison. They changed it for all the "special" people who think that voicing a button to mount a drive is too much work. The best way I've found is to stream it (which is a whole other ball of wax) or to just take out your memory card and put it in a usb micro sd drive. If anyone else knows a way to get mass storage mode (OTHER than using a custom kernel ) please let me know too!
Which one? I tryed two and they were garbage.
With DivX plus codec software on a windows 7 pc you can stream it directly. You have to make sure your pc can see the ps3. I had to fiddle around a LOT to do it. My friend did it easily. I don't know why mine was so hard lol. Just MY luck. But my advice is to unload your video on your pc. Then stream it. Converting or encoding mkv takes forever. If you root your device. And install busybox there's a thread here on xda onshore to get back Mass Storage mode. I've been reading it after your post.
