Testing Env:
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BIOS:
BDW2: stepping 2 (BIOS stepping C) (id=0x1606 (rev 04)), Lynx Point 00 (A0 stepping) and Host bridge id=0x1604 (rev 04) 2Cores/4Thread, CPU Genuine Intel(R) CPU 0000 @ 1.20GHz, GT1 200MHz; BIOS version: BDW-EIR1.86C.0053.R01.13112042022; KSC version: V1.05; 
Arch: x86_64
Kernel_version: 3.13.0_drm-intel-nightly_1be8f2_20140225+
Libdrm: (master)libdrm-2.4.52-4-gc5de5abbd90333fe1359283fb3a5e457b0f389f3
Mesa: (master)73c78c514f8db0605c0deb85382003d0f66b5525
Xserver: (master)xorg-server-1.15.0-631-g0f10cfd4b903d4db293ec47c8a9a0d8b33965803
Xf86_video_intel: (master)2.99.910-68-gff49944928c7399527b11bb0da7699711591c21a
Libva: (staging)8be6d274d931d8041934efa63caaee75a5984755
Libva_intel_driver: (staging)bd630edd844b88ea543a027654db296ff7da16cd
Ffmpeg: (master)fff526230148b3a67c04c328eecb16efac654e68
Mplayer: (hwaccel-vaapi)1923fa10ed77bbf8408f2ce312d85a97dab1f0f3
Glib: (master)e7bde4acf4499d353780b696435e1a43dee66c54
Gstreamer10: (1.0)4e880d4d1e151ea64f83c28b5c3e1bbc06c57903
Gst_plugins_base10: (1.0)2dd3f028c1e6dea799d7496639f53220818b20b1
Gst_plugins_good10: (1.0)643d425f51f81b56deec16c01162637546708ee5
Gst_plugins_bad10: (1.0)0587ab41b4f9979e9cfc11011ed5c970569ee3d3
Gst_plugins_ugly10: (1.0)c7c911b8320576429e4a4234a1e29ec7436e6814
Gst_plugins_vaapi10: (master)e52d394b9e1e7124a141cc26675068e6fc2446a9
Testing Steps:
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1. Writing 4 scripts, named encode1.sh, encode2.sh, encode3.sh, encode4.sh, which only output name different.
The content for encode1.sh is as follows:
#!/bin/bash
source /root/media_tools/gst10.env
rm -rf /root/.cache/gstreamer-1.0/
rm -rf '/root/.gstreamer-0.10/*'
gst-launch-1.0 -v filesrc location=/root/media_tools/encoder/encoderbitstreams/1080p_blue_sky.yuv 'Unable to render embedded object: File (' videoparse format=i420 width=1920 height=1080 ') not found.' vaapiencode_h264 rate-control=cqp bitrate=0 keyframe-period=30 max-bframes=2 init-qp=28 num-slices=0 cabac=false dct8x8=false 'Unable to render embedded object: File (' qtmux faststart=true ') not found.' filesink location=/tmp/1080p_blue_sky.yuv1.264
For encode2.sh, only changed at output "filesink location=/tmp/1080p_blue_sky.yuv2.264", the situation is the same with encode3.sh and encode4.sh.
2. Start 4 terminal and run following command at each of the terminals:
. encode1.sh
. encode2.sh
. encode3.sh
. encode4.sh
We found BDW02 can concurrent encoding 4 streams, but the size of the 4 streams are different:
14555275 1080p_blue_sky.yuv1.264
14520283 1080p_blue_sky.yuv2.264
14696860 1080p_blue_sky.yuv3.264
14676573 1080p_blue_sky.yuv4.264
Comparing with IVB with the same command, we got the same output:
12241818 1080p_blue_sky.yuv1.264
12241818 1080p_blue_sky.yuv2.264
B.T.W. We played the 4 different sized output streams with mplayer, they can play normally.
Reproduce Rate:
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100%