[whatwg] Remove addCueRange/removeCueRanges
singer at apple.com
Tue Aug 25 14:25:45 PDT 2009
At 0:49 +1200 23/08/09, Robert O'Callahan wrote:
>On Mon, Aug 17, 2009 at 8:04 PM, Max Romantschuk
><<mailto:max at romantschuk.fi>max at romantschuk.fi> wrote:
>Silvia Pfeiffer wrote:
>Precision is influenced more strongly by the temporal
>resolution of the decoding pipeline rather than the polling resolution
>for currentTime. I doubt the previous implementations of "start" and
>"end" gave you a 3 sample accurate resolution even for wav files.
>I'll chime in here, having done extensive work with audio and video
>codecs. With current codec implementations getting sample- or
>frame-accurate resolution is largely a pipe dream. (Outside of the
>realm of platforms dedicated to content production and playback.)
>Especially for video there can be several seconds between keyframes,
>frame-accurate jumps requiring complex buffering tricks.
>Those tricks aren't that hard, at least for Theora; we do them in Firefox.
It's very easy in QuickTime or MP4. Timestamps of the frames can be
sample accurate, so you decode the right frame, and trim the result.
>"He was pierced for our transgressions, he was crushed for our
>iniquities; the punishment that brought us peace was upon him, and
>by his wounds we are healed. We all, like sheep, have gone astray,
>each of us has turned to his own way; and the LORD has laid on him
>the iniquity of us all." [Isaiah 53:5-6]
Multimedia Standards, Apple Inc.
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