[whatwg] Video : Slow motion, fast forward effects

Peter Kasting pkasting at google.com
Tue Oct 14 11:28:08 PDT 2008

On Tue, Oct 14, 2008 at 8:00 AM, Eric Carlson <eric.carlson at apple.com>wrote:

>  Some media formats and/or engines may not support reverse playback, but I
> think it is a mistake for the spec to mandate this behavior. Why is reverse
> playback different from other situations described in the spec where
> different UAs/ media formats will result in different behavior, eg. pitch
> adjusted audio, negotiation with a server to achieve the appropriate
> playback rate, etc?
>  I think the current sentence that talks about audio playback rate:
>  When the playbackRate is so low or so high that the user agent cannot play
> audio usefully, the corresponding audio must not play.
> could be modified to include reverse playback as well:
>  When the playbackRate is such that the user agent cannot play audio
> usefully (eg. too low, too high, negative when the format or engine does not
> support reverse playback), the corresponding audio must not play.

Agree wholeheartedly.

Mandating silence during reverse playback seems bizarre in the abstract,
unnecessary if authors have a way to mute, and potentially detrimental to
future applications which may _want_ to be able to do this in a controlled
fashion (e.g. a virtual turntable application).

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