<div dir="ltr">Hi,<div><br></div><div>Sorry I couldnt get to this before v2.0. Can you share a file with the subtitles burned into the x264-crf0 lossless video?</div><div><br></div><div>Thanks,</div><div>Deepthi</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, May 15, 2016 at 3:49 AM, Rômulo Silva <span dir="ltr"><<a href="mailto:rsilva2k5@gmail.com" target="_blank">rsilva2k5@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Some more info on the issue.<div><div><br></div><div><br></div><div>I updated my x265 encoder to 1.9+167 and tested the same sample with the same parameters (CRF 21, 10-Bit, preset slower) with --no-recursion-skip as the only additional parameter.</div><div><br></div><div><br></div><div>x265 hardsub sample [--no-recursion-skip]: <a href="http://www.mediafire.com/download/lx98hc6n5b40db2/hardsub+test+norecursionskip.mkv" target="_blank">http://www.mediafire.com/download/lx98hc6n5b40db2/hardsub+test+norecursionskip.mkv</a></div><div><br></div><div><br></div><div>The result is much better compared to not using the --no-recursion-skip parameter, but there's still some ghosting on both books in the scene around the letters. File size is around 10% bigger, and encoding time was more or less 50% slower just like pointed out here: <a href="http://forum.doom9.org/showthread.php?p=1767551#post1767551" rel="nofollow" style="color:rgb(53,114,176);text-decoration:none;font-family:Arial,sans-serif;font-size:14px;line-height:20px" target="_blank">http://forum.doom9.org/showthread.php?p=1767551#post1767551</a></div><div><br></div><div><br></div><div>Thanks again,</div></div><div><br></div><div>R.S.</div></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Mon, May 9, 2016 at 5:59 PM, Rômulo Silva <span dir="ltr"><<a href="mailto:rsilva2k5@gmail.com" target="_blank">rsilva2k5@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>This is related to issue #214: <a href="https://bitbucket.org/multicoreware/x265/issues/214/ghosting-artefacts-even-with-low-crf-when" target="_blank">https://bitbucket.org/multicoreware/x265/issues/214/ghosting-artefacts-even-with-low-crf-when</a></div><div><br></div><div><br></div><div>Turns out that it's easy to reproduce the problem with hardsubs, and I've included both x264 and x265 samples below to illustrate this.</div><div><br></div><div><br></div><div>Lossless x264 sample: <a href="http://www.mediafire.com/download/ftwysmcemw7211a/x264+crf0.mkv" target="_blank">http://www.mediafire.com/download/ftwysmcemw7211a/x264+crf0.mkv</a></div><div>Sample subtitle: <a href="http://www.mediafire.com/download/jttvyk2k0va9c3g/lorem+ipsum.ass" target="_blank">http://www.mediafire.com/download/jttvyk2k0va9c3g/lorem+ipsum.ass</a></div><div>x264 hardsub sample: <a href="http://www.mediafire.com/download/nzp7pzz5y8h7yjy/hardsub_test_x264.mkv" target="_blank">http://www.mediafire.com/download/nzp7pzz5y8h7yjy/hardsub_test_x264.mkv</a></div><div>x265 hardsub sample: <a href="http://www.mediafire.com/download/mz51v2a8d99pa5t/hardsub+test.mkv" target="_blank">http://www.mediafire.com/download/mz51v2a8d99pa5t/hardsub+test.mkv</a></div><div><br></div><div><br></div><div>Both hardsub files were encoded with CRF 21, 10-Bit and slower preset. X265 encoder version was 1.9+150-00ea3784bd36.</div><div><br></div><div>You can clearly see the artifacts between the two lines on top of the left book. Some ornaments get distorted around the letters, and straight edges don't move according to the scene.</div><div><br></div><div>A few suggested workarounds, like --no-cutree, make the ghosting less apparent, but it still doesn't solve the issue completely. I've included below a sample of the same x265 encode used above (CRF 21, 10-Bit, slower) with --no-cutree as the only additional parameter.</div><div><br></div><div><br></div><div>x265 hardsub sample [--no-cutree]: <a href="http://www.mediafire.com/download/abvwr1jbp47uw29/hardsub_test_nocutree.mkv" target="_blank">http://www.mediafire.com/download/abvwr1jbp47uw29/hardsub_test_nocutree.mkv</a></div><div><br></div><div><br></div><div>The resulting file has over twice the size, and even though the artifacts on ornaments are mostly gone, some straight edges in between the lines are still not moving according to the scene.</div><div><br></div><div>Has any progress been made on this issue? I'm willing to help by providing more samples and test cases, if needed.</div><div><br></div><div><br></div><div>Thanks for your attention,</div><div><br></div><div>R.S.</div></div>
</blockquote></div><br></div>
</div></div><br>_______________________________________________<br>
x265-devel mailing list<br>
<a href="mailto:x265-devel@videolan.org">x265-devel@videolan.org</a><br>
<a href="https://mailman.videolan.org/listinfo/x265-devel" rel="noreferrer" target="_blank">https://mailman.videolan.org/listinfo/x265-devel</a><br>
<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div>Deepthi Nandakumar<br></div>Engineering Manager, x265<br></div>Multicoreware, Inc<br></div></div>
</div>