I would like to watch recorded lectures at 1.7x of their original speed.
Which app will allow me to do that?
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I can't find any playback app on the iPad with the exact 1.7 ratio...
However, Azul for iPad (app store link) has 1.5 and 1.75 playback ratios. They even say in their site blurb that it's good for fast reviewing of lectures.
Reviews are excellent and integration with Mail and Dropbox is there, as well as a very comprehensive codec list
Speedeo just came out for both iPhone and iPad and allows you to increase / decrease videos in 0.25 increments. You can also resume watching videos quickly from the history screen. You can view videos from 0.25x to 2x speed, quite neat for watching presentations / tutorials.
Note: I am one of the developers of this app
AVPlayerHD supports 1.05 to 2x in 0.05 increments (and is available in the Swedish Itunes Store, which Swift Player and Azul aren't, and I assume other non-US users will have the same problem.)
I am not affiliated with this app.
As an author I could recommend a new Free iOS player with variable playback speed and many other adjustable playback options alphaSXplayer