Well it should actually not be very difficult to create a video player with a better capability than the Symbos one. From the symbos website if you look at this picture you can get more details on the format they use:
Imgae size: 248x128
Datarate: 768kbit/s (96KB/s)
sound: unknown for me
So as you see it should be no problem whatsoever even for the slowest amiga with the deadest interface to mimic that format and reproduce it.
Of course there is lots of room for improvements on the quality area for an amiga version.
It should be a really nice project for an enterpreneur amiga developer to get a video player like that, and an encoder of course!