Just a nit: "--crf 0" is not meant to be "lossless", the quantization
might still vary; "--qp 0" is certainly lossless, as documented in "x264
--fullhelp". But you should consider your file "quasi-lossless", with no
noticeable difference.
Am 15.07.2016, 20:25 Uhr, schrieb Rômulo Silva <rsilva...@gmail.com>:
Hello.
There you go:
http://www.mediafire.com/download/crmj9d7ylsg32dm/x264_crf0_hardsub.mkv
Encoded with x264, revision 2692, 10bit, preset veryslow, CRF 0.
Cheers,
R.S.
On Fri, Jul 15, 2016 at 8:56 AM, Deepthi Nandakumar <
deep...@multicorewareinc.com> wrote:
Hi,
Sorry I couldnt get to this before v2.0. Can you share a file with the
subtitles burned into the x264-crf0 lossless video?
Thanks,
Deepthi
On Sun, May 15, 2016 at 3:49 AM, Rômulo Silva <rsilva...@gmail.com>
wrote:
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 <rsilva...@gmail.com>
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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Deepthi Nandakumar
Engineering Manager, x265
Multicoreware, Inc
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mailto:cont...@ligh.de
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