[whatwg] Video : Slow motion, fast forward effects

WeBMartians webmartians at verizon.net
Tue Oct 14 12:34:48 PDT 2008

I agree that scrubbing requires non-1X audio. However, to require it is going to cause CoDec/PlugIn developers not just headaches
but maybe aneurisms as well.

Interestingly enough, audio at varied play rates has the potential to retain tonality. Since the audio is encoded with something
like a Fourier transform, the data is "spectral" rather than "wave." The samples may be presented tonally-accurate even if their
duration is not 1:1.

Nonetheless, you're going to be very unpopular if the word "required" starts showing up.


From: whatwg-bounces at lists.whatwg.org [mailto:whatwg-bounces at lists.whatwg.org] On Behalf Of Charles Iliya Krempeaux
Sent: Tuesday, 2008 October 14 15:24
To: Ian Hickson
Cc: whatwg at whatwg.org
Subject: Re: [whatwg] Video : Slow motion, fast forward effects

Hello Ian,

On Mon, Oct 13, 2008 at 3:41 PM, Ian Hickson <ian at hixie.ch> wrote:


	On Thu, 7 Aug 2008, Charles Iliya Krempeaux wrote:
	> This feature would be used to implement "scrubing".  Like what you see
	> in Non-Linear Editors... for making movies, etc.  (I.e., grabbing the
	> "position handle" of the player, and moving it forwards and backwards
	> through the video, and varying speeds, to find what you are looking
	> for.)
	> In those types of applications, the audio is on.  And it is important
	> for usability, for the video editor to hear the sound.
	I agree that on the long term we would want to provide this, but I think
	that is something we should offer as a separate feature (e.g. a flag that
	decides whether reverse-playback audio is muted or not, defaulting to true
	for compatibility with today).

If there's some way of turning this feature "on" (when it is available)... that would be sufficient for scrubbing AFAICT.
Charles Iliya Krempeaux, B.Sc.

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