Does anyone know definitively whether iMovie for iPad actually re-encodes the video it's editing, or if it just cuts it and then remuxes it without any conversion/encoding at all? Seems to me this would be more plausible given its speed compared to what one would expect from its processor, even with a hardware h.264 encoder/decoder.
If you don't know what I mean by 'remuxing without conversion,' do this on your Mac:
Open up a video in QuickTime X. Hit Command-T to open up the 'trim' tool. Go to File > Save As... and choose Format > Movie. Then, do Save As... again, and choose anything other than 'Movie.' The longer a clip you choose, the bigger difference it will make. The former action you did was just 'remuxing.' No conversion is done. It's just cut and put into a different container file.
I wonder if this isn't what iMovie for iOS is doing, except in cases where it HAS to render/re-encode for things like titles & transitions.
If you don't know what I mean by 'remuxing without conversion,' do this on your Mac:
Open up a video in QuickTime X. Hit Command-T to open up the 'trim' tool. Go to File > Save As... and choose Format > Movie. Then, do Save As... again, and choose anything other than 'Movie.' The longer a clip you choose, the bigger difference it will make. The former action you did was just 'remuxing.' No conversion is done. It's just cut and put into a different container file.
I wonder if this isn't what iMovie for iOS is doing, except in cases where it HAS to render/re-encode for things like titles & transitions.