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addCueRange/removeCueRanges</title></head><body>
<div>At 0:49 +1200 23/08/09, Robert O'Callahan wrote:</div>
<blockquote type="cite" cite>On Mon, Aug 17, 2009 at 8:04 PM, Max
Romantschuk <<a
href="mailto:max@romantschuk.fi">max@romantschuk.fi</a>> wrote:<br>
<blockquote>Silvia Pfeiffer wrote:<br>
<blockquote>Precision is influenced more strongly by the temporal<br>
resolution of the decoding pipeline rather than the polling
resolution<br>
for currentTime. I doubt the previous implementations of "start"
and<br>
"end" gave you a 3 sample accurate resolution even for wav
files.<br>
</blockquote>
</blockquote>
<blockquote><br></blockquote>
<blockquote>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.<br>
</blockquote>
</blockquote>
<blockquote type="cite" cite> </blockquote>
<blockquote type="cite" cite>Those tricks aren't that hard, at least
for Theora; we do them in Firefox.</blockquote>
<div><br></div>
<div>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.</div>
<div><br></div>
<blockquote type="cite" cite><br>
Rob<br>
--<br>
"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]</blockquote>
<div><br></div>
<div><br></div>
<x-sigsep><pre>--
</pre></x-sigsep>
<div>David Singer<br>
Multimedia Standards, Apple Inc.</div>
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