Some more info on the issue.
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. x265 hardsub sample [--no-recursion-skip]: http://www.mediafire.com/download/lx98hc6n5b40db2/hardsub+test+norecursionskip.mkv 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: http://forum.doom9.org/showthread.php?p=1767551#post1767551 Thanks again, R.S. On Mon, May 9, 2016 at 5:59 PM, Rômulo Silva <[email protected]> wrote: > This is related to issue #214: > https://bitbucket.org/multicoreware/x265/issues/214/ghosting-artefacts-even-with-low-crf-when > > > 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. > > > Lossless x264 sample: > http://www.mediafire.com/download/ftwysmcemw7211a/x264+crf0.mkv > Sample subtitle: > http://www.mediafire.com/download/jttvyk2k0va9c3g/lorem+ipsum.ass > x264 hardsub sample: > http://www.mediafire.com/download/nzp7pzz5y8h7yjy/hardsub_test_x264.mkv > x265 hardsub sample: > http://www.mediafire.com/download/mz51v2a8d99pa5t/hardsub+test.mkv > > > Both hardsub files were encoded with CRF 21, 10-Bit and slower preset. > X265 encoder version was 1.9+150-00ea3784bd36. > > 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. > > 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. > > > x265 hardsub sample [--no-cutree]: > http://www.mediafire.com/download/abvwr1jbp47uw29/hardsub_test_nocutree.mkv > > > 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. > > Has any progress been made on this issue? I'm willing to help by providing > more samples and test cases, if needed. > > > Thanks for your attention, > > R.S. >
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