I've done simultaneous hardware encoding before (two 640x480 videos) but I haven't pushed the boundaries yet. I have a hunch that newer phones might be able to

I've done simultaneous hardware encoding before (two 640x480 videos) but I haven't pushed the boundaries yet. I have a hunch that newer phones might be able to do a few bitrates at the same time, but at that point we will do re-encoding server side because end users will have more limited upload bandwidth than our servers.