On Sat, Aug 29, 2015 at 8:27 AM, Robert O'Callahan <rob...@ocallahan.org> wrote: > On Sat, Aug 29, 2015 at 8:18 AM, James Ross <ja...@james-ross.co.uk> wrote: > >> Support is certainly poor; Internet Explorer/Trident and Edge both support >> negative playback rates on desktop (I haven’t tested mobile) but do so by >> simply showing the key frames as they are reached in reverse, in my testing. > > That's not so hard to implement, but it's also mostly useless since > keyframes are often several seconds apart or more.
It could be useful for a few usecases like fast-backward. Windows Media Player does it this way. FWIW, QuickTime supports per-frame backward playback if you press and hold the left arrow. I guess they cannot guarantee the rate, which makes them require holding the key instead of providing a playback rate setting. - Xidorn