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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