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Old 18th December 2018, 11:09   #81  |  Link
jpsdr
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Well, the person maintaining "tMod" build obviously did not bother to port all of the "custom" patches to latest x264 after the "8/10 bits unification" (Dec 2017), which was quite a big change in x264 codebase.

Instead "tMod" build seems now to be based on an old version of x264, just before the big "8/10 bits unification" happened with a some fixes cherry-picked from x264 master...
Yes, toooooooo much work to port all the custom patches.
Instead, i manualy put all the fixes from the master, except things which are specific to CPU not Intel.
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Old 18th December 2018, 17:02   #82  |  Link
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..."8/10 bits unification" (Dec 2017), which was quite a big change in x264 codebase.

Instead "tMod" build seems now to be based on an old version of x264, just before the big "8/10 bits unification" happened with a some fixes cherry-picked from x264 master...
Not sure if that unification is the reason but tMod build comes as the fastest for which I tested. Hopefully I don't miss much of the latest master builds.
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Old 18th December 2018, 23:41   #83  |  Link
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Not sure if that unification is the reason but tMod build comes as the fastest for which I tested. Hopefully I don't miss much of the latest master builds.
Comparing the speed of x264 builds that have not been built from the same revision (Git commit), or even comparing "vanilla" builds to builds that contain "custom" patches, won't yield much meaningful results.

(It would pretty much be a comparison of apples and oranges, because a whole lot of things may have changed between the builds you are comparing)
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Last edited by LoRd_MuldeR; 19th December 2018 at 04:18.
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Old 19th December 2018, 22:14   #84  |  Link
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Just comparing them seems like none of them are compiled with opencl support? Was this deprecated at some point? I was reading about it not speeding up encoding much (~3%) but that translates to hours if your plan is to encode a library.
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Old 19th December 2018, 22:23   #85  |  Link
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I was reading about it not speeding up encoding much (~3%)
I did some tests with "--OpenCL" a while ago and the speedup was ~1% at best (GTX750).
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Old 19th December 2018, 22:27   #86  |  Link
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Is there a build to test? I just bought a GTX1070 and maybe it can be faster with current opencl enabled builds.
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Old 19th December 2018, 22:41   #87  |  Link
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Is there a build to test? I just bought a GTX1070 and maybe it can be faster with current opencl enabled builds.
Most builds should have it enabled since it's the default. You have to disable it in ./configure (--disable-opencl) if you don't want it included.
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Old 19th December 2018, 22:44   #88  |  Link
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(compiled) builds
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Old 19th December 2018, 22:52   #89  |  Link
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(compiled) builds
Huh?

Have you tried this or the builds from VideoHelp?
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Last edited by Groucho2004; 19th December 2018 at 22:54.
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Old 19th December 2018, 22:53   #90  |  Link
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(compiled) builds
Both LigH's x264, and the videolan one, are compiled with OpenCL support. So, it's just a matter of running your x264 flavor command-line with --opencl or not, for the test.
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Old 19th December 2018, 22:58   #91  |  Link
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I tested with videolan's, Ligh's and tmod. So not sure why it doesn't work, it warns me with a:
Code:
x264 [warning]: OpenCL: not compiled with OpenCL support, disabling
Using x64 builds in 10bit mode.

edit: yes confirmed, not working in 10-bit mode, only in 8-bit.

Last edited by Dogway; 19th December 2018 at 23:02.
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Old 19th December 2018, 23:14   #92  |  Link
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I tested with videolan's, Ligh's and tmod. So not sure why it doesn't work, it warns me with a:
Code:
x264 [warning]: OpenCL: not compiled with OpenCL support, disabling
Using x64 builds in 10bit mode.

edit: yes confirmed, not working in 10-bit mode, only in 8-bit.

It just so happened Lord_Mulder explained the 10-bit thing to me this very day. See: no OpenCL for 10-bit
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Old 19th December 2018, 23:23   #93  |  Link
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lol the very same question, I guess I clicked on the wrong thread. 8-bit encoding then it seems (with banding
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Old 20th December 2018, 09:47   #94  |  Link
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I'm not 100% sure so this may have to be verified, but i vaguely remember reading once (it was now a long time ago), also that opencl doesn't produce exactly the same result than pure software (a little less good).
Considering that, the fact that to compile with opencl you need to install others third-party "things", the fact that speedup is not realy significant, i personnaly don't compile with opencl in the releases i made, and don't intend to bother with.
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Old 20th December 2018, 10:17   #95  |  Link
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I'm not 100% sure so this may have to be verified, but i vaguely remember reading once (it was now a long time ago), also that opencl doesn't produce exactly the same result than pure software (a little less good).
That would suck. Especially if the gain is allegedly only like 1%.

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Considering that, the fact that to compile with opencl you need to install others third-party "things", the fact that speedup is not realy significant, i personnaly don't compile with opencl in the releases i made, and don't intend to bother with.
A reasonable position. It's just that, in my quest for ever-more GPU-assisted tools, OpenCL just feels right; but it may just be a placebo.

As for having to 'install' third-party "things", I don't think that's a real issue: every Windows install will come with at least a default OpenCL.dll in its path.
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Old 20th December 2018, 10:44   #96  |  Link
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I made a test and at slower preset I get 109fps without opencl and 113 at most with it. That's about 3%, or an extra 1h and a half of rendering content for a 24fps film for 9h at night. tMod is already 3 or 4% faster than other builds I tested so if what you say is true I guess than at equal speed I would rather use one that doesn't degrade my content. Too bad we can't have both for a 7% gain haha.
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Old 20th December 2018, 10:46   #97  |  Link
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An OpenCL driver is usually part of the graphic driver set (like OpenGL and maybe even OpenAL).
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Old 21st December 2018, 10:24   #98  |  Link
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Someone (not me... ) made tests with my releases (only on the x64 versions). It says that win32 version was around 1~2% faster than posix version, and Broadwell version was around also 1~2% faster than "normal" release. Both combined, you can indeed maybe achieve 3~4%. Different build configuration can explain differences in speed, but only that. Otherwise, code is the same. I'm not sure that only difference in gcc version could produce a such difference on speed.
Out of curiosity, when you said tMod is around 3~4%, which build ? Win32 or Posix ? Normal or Broadwell ?

Ah, and about opencl, i should have said : To build with it, it seems that i need to install in the build environement some others third party things i don't know about, so, too much bother for something from my point of view is not worth it.
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Last edited by jpsdr; 21st December 2018 at 10:27.
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Old 21st December 2018, 14:14   #99  |  Link
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I own a 4670K so didn't use the Broadwell build only x64 of winthread. Not sure if my earlier tests were wrong I just ran another test both in 8 and 10bit for 7000 frames and LigH's is slightly faster 2%. Maybe different content yields different speeds. I read the speed from the last line when encoding finishes I assume means average.

Source: 1080p@60fps 8-bit CRF: 24 preset: slow tune: touhou

8-bit
tmod 111.92fps 107.45fps 117.62(--no progress)
LigH 113.54fps 116.83fps
vlan 117.05fps 116.57
LigH 121.68fps (--opencl on GTX1070)
vlan 121.26fps (--opencl on GTX1070)

10-bit
tmod 65.64fps
LigH 66.10fps


On a different note I get worse results in 10-bit for the same target bitrate (same settings) and even worse quality with x265 also 10-bit, makes no sense, would like to see some quality benchmarks out there.

Last edited by Dogway; 21st December 2018 at 21:13.
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Old 21st December 2018, 14:19   #100  |  Link
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I own a 4670K so didn't use the Broadwell build only x64 of winthread. Not sure if my earlier tests were wrong I just ran another test both in 8 and 10bit for 7000 frames and Ligh's is slightly faster 2%. Maybe different content yields different speeds. I read the speed from the last line when encoding finishes I assume means average.

Source: 1080p@60fps 8-bit preset: slow tune: touhou (not using opencl)

8-bit
tmod 111.92fps
Ligh 113.54fps
Ligh 121.68fps (--opencl)
Interesting results. How does 'vanilla' (videolan) x264 fare, compared to those?!
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