<div dir="ltr">Looks interesting, but their promotion materials has no technical data about how video was encoded with libx264. At least what preset was used? What profile?<div><br></div><div>They say that they analyze image and find which parts of image should stay blurred (movements or something like this) and which parts should use more bits, for better human perception. Also x264 has some options which defines some same prerequisites for bits allocation like: "psy-rd" or simple "tune" options and adaptive quantization</div><div><div><br></div></div><div>Maybe they made some improvements in these algorithms?</div><div class="gmail_extra"><br><div class="gmail_quote">2016-05-12 5:10 GMT+03:00 qw <span dir="ltr"><<a href="mailto:applemax82@163.com" target="_blank">applemax82@163.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><div>//Are you see below comment in there: "<span style="color:rgb(78,78,78);font-family:Roboto,'Helvetica Neue',Arial,sans-serif;font-size:16px;line-height:22px">In
a recent subjective test that included video clips distributed across
the motion-complexity spectrum, //IQ264x achieved a median gain of 26.5%
when compared to the reference x264 encoder."</span></div><div><br></div><div><span style="line-height:23.8px">//It means in the specially case, their algorithm may reduce bitrate (or call improve compression efficiency).</span></div><div><span style="line-height:23.8px">//I guess the algorithm based on </span>Dynamic Programming, it made MV and <span style="line-height:23.8px">Mode</span><span style="line-height:23.8px"> </span><span style="line-height:1.7">prediction
become more effect on these environment (this technology have more
//powerful on HEVC since these longer candidate list)</span></div><div><span style="line-height:1.7"><br></span></div>I think, the article tries to show that, the new algorithm can improve video quality, especially for video sequence with motion-complexity spectrum.<div><div><br><br><br><br><br><div style="zoom:1"></div><div></div><br>At 2016-05-11 22:44:29, "chen" <<a href="mailto:chenm003@163.com" target="_blank">chenm003@163.com</a>> wrote:<br> <blockquote style="PADDING-LEFT:1ex;MARGIN:0px 0px 0px 0.8ex;BORDER-LEFT:#ccc 1px solid"><div style="line-height:1.7;color:#000000;font-size:14px;font-family:arial">Hi Andrew,<div><br></div><div>Are you see below comment in there: "<span style="color:rgb(78,78,78);font-family:Roboto,'Helvetica Neue',Arial,sans-serif;font-size:16px;line-height:22px">In a recent subjective test that included video clips distributed across the motion-complexity spectrum, IQ264x achieved a median gain of 26.5% when compared to the reference x264 encoder."</span></div><div><br></div><div><span style="line-height:23.8px">It means in the specially case, their algorithm may reduce bitrate (or call improve compression efficiency).</span></div><div><span style="line-height:23.8px">I guess the algorithm based on </span>Dynamic Programming, it made MV and <span style="line-height:23.8px">Mode</span><span style="line-height:23.8px"> </span><span style="line-height:1.7">prediction become more effect on these environment (this technology have more powerful on HEVC since these longer candidate list)</span></div><div><span style="line-height:1.7"><br></span></div><div><span style="line-height:1.7">Regards,</span></div><div><span style="line-height:1.7">Min</span></div><div><font face="Roboto, Helvetica Neue, Arial, sans-serif" color="#4e4e4e"><span style="font-size:16px;line-height:22px"><br></span></font>At 2016-05-11 19:33:10,qw <<a href="mailto:applemax82@163.com" target="_blank">applemax82@163.com</a>> wrote:<br> <blockquote style="PADDING-LEFT:1ex;MARGIN:0px 0px 0px 0.8ex;BORDER-LEFT:#ccc 1px solid"><div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><div>Hi simon,<br><br>I found one article that says the current version of x264 is not good enough, and there is some space to improve its compression efficiency.<br><br><a href="http://www.prweb.com/releases/2016/03/prweb13296419.htm" target="_blank">http://www.prweb.com/releases/2016/03/prweb13296419.htm</a><br><br></div><br><br><br><div style="zoom:1"></div><div></div><br>At 2016-05-11 18:03:56, "Simon Horlick" <<a href="mailto:simonhorlick@gmail.com" target="_blank">simonhorlick@gmail.com</a>> wrote:<br> <blockquote style="PADDING-LEFT:1ex;MARGIN:0px 0px 0px 0.8ex;BORDER-LEFT:#ccc 1px solid"><div></div><div>Hi Andrew,</div><div><br></div><div>What algorithm is this? Is there a research paper you're referring to? I'd be very surprised if there were a way to make x264 20% better.</div><div><br></div><div>Simon</div><div><br>On 11 May 2016, at 17:20, qw <<a href="mailto:applemax82@163.com" target="_blank">applemax82@163.com</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><div>Hi,<br><br>I found one impressed video algorithm that can yield an average of more than 20% bandwidth savings, doing so without impacting video quality, compared with x264 encoder. The impressed video algorithm has perceptual quality optimization method to select optimal qp value, where visually important or less important regions of a video frame are determined in terms of spatial and temporal information.<br><br>Can x264 developers do some research, and design and implement some similar algorithm to improve compression efficiency?<br><br>Thanks!<br><br>B.R.<br><br>Andrew<br></div></div><br><br><span title="neteasefooter"><p> </p></span></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>x264-devel mailing list</span><br><span><a href="mailto:x264-devel@videolan.org" target="_blank">x264-devel@videolan.org</a></span><br><span><a href="https://mailman.videolan.org/listinfo/x264-devel" target="_blank">https://mailman.videolan.org/listinfo/x264-devel</a></span><br></div></blockquote></blockquote></div><br><br><span title="neteasefooter"><p> </p></span></blockquote></div></div></blockquote></div></div></div><br><br><span title="neteasefooter"><p> </p></span><br>_______________________________________________<br>
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