Oh well it was worth a shot. I guess nobody cares to encode. I for one can not watch this on mobile because the way to watch it in emulator does not work for mobile.
Yeah, those are what mz (and co.) did. I don't know anything about how stable it is, but if £e Nécroyeur can make a TAS with it, then we have what to talk about! :)
As much as I would love to see (or TAS) this, MAME videos are not accepted here. Please change this policy! :)
Does it have a stable rerecording already? I think MAME-rr project was abandoned a few years ago.
But even if it was, there was that guy, mz, who saw the code for the first time, fixed a few bugs in fceu, and then added rerecording to PCSX and FBA out of nowhere! Probably if you have that dedication, you can help the MAME situation too :) Or maybe it had some chance to be BizHawked?
EDIT:
From what I was told, MAME is basically "own core for each set of hardware" and neither of them was designed with rerecording in mind. So you add rerecording to games, like in hourglass, not to the whole platform.
There is a version that was released in June 2013 but I think that its just a port to Linux. The most recent version of MAME-RR is mame-rr-0144-test0 but there is also mess-rr-0144-test0 and mame-mess-rr-0144-test0-src released in Nov 2011
EDIT: The most recent source code release is r163 released Oct. 20 2012