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<div class="gmail_extra"><br><br><div class="gmail_quote">2012/12/10 Jason Garrett-Glaser <span dir="ltr"><<a href="mailto:jason@x264.com" target="_blank">jason@x264.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="HOEnZb"><div class="h5">On Mon, Dec 10, 2012 at 7:22 AM, eloise vidal <<a href="mailto:eloise.vidal@gmail.com">eloise.vidal@gmail.com</a>> wrote:<br>
> Hi,<br>
> I have a question about the Intra modes used by x264.<br>
> I noticed that 3 modes are used in addition to the standardized modes (4<br>
> modes(fashions) for blocks 16x16 and 9 modes(fashions) for blocks 4x4):<br>
> DC_LEFT, DC_TOP and DC_128.<br>
><br>
> Are these three modes specific to x264? And if it is the case, how the<br>
> encoded stream can be in accordance with the standard H.264?<br>
<br>
</div></div>There are 4 possible DC modes in progressive H.264; which one is<br>
selected depends on the availability of neighbors to predict from.<br>
x264 separates them for reasons of simplicity, the spec doesn't, but<br>
the result is equivalent.<br>
<br>
Jason<br>
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