[x264-devel] x264 + Intel 4th gen CPUs and OpenCL
Anders Cedronius
anders.cedronius at netinsight.net
Tue Nov 26 15:08:58 CET 2013
I've been playing around with the OpenCL implementation in x264 and intels 4th generation CPUs
On Linux currently Intel 'only' support CPU based OpenCL. So I changed opencl.c in x264 to support 'CL_DEVICE_TYPE_CPU'
Compiled the snapshot downloaded 2013-11-25 and ran.
./x264 --bitrate 20000 --demuxer raw --input-csp i420 --input-range tv --input-depth 8 --input-res 1280x720 --fps 50 --preset medium --opencl -o /media/LaCie/yuv/x264_out/test.264 /media/LaCie/yuv/seq/parkjoy_420_8bit.yuv
raw [info]: 1280x720p 0:0 @ 50/1 fps (cfr)
x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
x264 [info]: OpenCL acceleration enabled with Intel(R) Corporation Genuine Intel(R) CPU 0000 @ 2.00GHz
x264 [info]: profile High, level 4.1
x264 [info]: frame I:2 Avg QP:22.04 size:282044
x264 [info]: frame P:497 Avg QP:30.78 size: 46261
x264 [info]: mb I I16..4: 7.1% 56.5% 36.5%
x264 [info]: mb P I16..4: 0.2% 1.4% 0.6% P16..4: 36.8% 21.6% 19.1% 0.0% 0.0% skip:20.2%
x264 [info]: final ratefactor: 19.61
x264 [info]: 8x8 transform intra:61.6% inter:44.9%
x264 [info]: coded y,uvDC,uvAC intra: 95.8% 96.4% 88.8% inter: 44.9% 29.2% 13.7%
x264 [info]: i16 v,h,dc,p: 6% 3% 50% 42%
x264 [info]: i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 11% 12% 26% 7% 9% 9% 9% 8% 10%
x264 [info]: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 12% 20% 9% 10% 9% 9% 8% 10%
x264 [info]: i8c dc,h,v,p: 62% 11% 15% 11%
x264 [info]: Weighted P-Frames: Y:0.0% UV:0.0%
x264 [info]: ref P L0: 76.3% 16.4% 5.5% 1.8%
x264 [info]: kb/s:18882.34
Well the performance as expected is not good but there are no complaints about OpenCL
But I want to check the performance of x264/OpenCL running on the GPUs so I went ahead and installed windows 7 64bit + the latest drivers for intels platform and Intels OpenCL SDK that reports two OpenCL devices: CL_DEVICE_TYPE_CPU (the CPU) and CL_DEVICE_TYPE_GPU (Intel(R) HD Graphics 4600)
However when running OpenCL now using the pre-compiled (http://download.videolan.org/pub/x264/binaries/win64/x264-r2377-1ca7bb9.exe)
I get this:
C:\x264>x264.exe --bitrate 15000 --demuxer raw --input-csp i420 --input-range tv
--input-depth 8 --input-res 1280x720 --fps 50 --preset medium --opencl -o d:\yu
v\x264_out\test.264 d:\yuv\seq\parkjoy_420_8bit.yuv
raw [info]: 1280x720p 0:0 @ 50/1 fps (cfr)
x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZ
CNT BMI2
x264 [info]: OpenCL acceleration enabled with Intel(R) Corporation Intel(R) HD Graphics 4600
x264 [info]: Compiling OpenCL kernels...
x264 [info]: profile High, level 4.1
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: x264 [error]: OpenCL: Unknown error
x264_encoder_encode failed
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [error]: OpenCL: Unknown error
x264 [error]: OpenCL: fatal error, aborting encode
x264 [info]: final ratefactor: 10.92
aborted at input frame 46, output frame 0
Just for testing I compiled the daily snapshot and got the exact same result as the above printout.
Then I modified the opencl.c to accept OpenCL CPU's
Then I got a different behaviour:
C:\x264_new>x264.exe --bitrate 15000 --demuxer raw --input-csp i420 --input-range tv --input-depth 8 --input-res 1280x720 --fps 50 --preset medium --opencl -o d:\yuv\x264_out\test.264 d:\yuv\seq\parkjoy_420_8bit.yuv
raw [info]: 1280x720p 0:0 @ 50/1 fps (cfr)
x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
x264 [info]: OpenCL acceleration enabled with Intel(R) Corporation Genuine Intel(R) CPU 0000 @ 2.00GHz
x264 [info]: Compiling OpenCL kernels...
x264 [info]: profile High, level 4.1
0x00471D37 (0x211D09C0 0x1633E020 0x00000003 0x00000050)
0x7599A00B (0x00000029 0x00000029 0x00001C20 0x00000001), memmove() + 0x1B1 byte
s(s)
0x0049B177 (0x00000029 0x00001C20 0x00000001 0x00000026)
And the then x264 just crashed. Running the same compile without OpenCL was flawless and everything was executing as expected.
I'm currently out of ideas on how to take this further and I hope some of you actually writing the code or have the expertise could help me out. I probably left out vital debugging information out so please let me know what information you're after.
Thanks for helping,
/Anders.
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