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按照例子执行，显示器黑屏， 终端输出如下信息：
[toybrick@toybrick workspace]$ ./demo_multi_gldisplay.py
Fatal: can't open lock file /run/xtables.lock: Permission denied
[12/13 03:28:31.128] D/: drm display open ...
[12/13 03:28:31.128] D/: Found display connectors: (encoders: 1)
[12/13 03:28:31.367] D/: #[0] id: 91, type :HDMIA (CONNECTED)
[12/13 03:28:31.367] D/: + [0] 1920x1080 : 1920x1080
[12/13 03:28:31.367] D/: + [1] 1920x1080 : 1920x1080
[12/13 03:28:31.367] D/: + [2] 1920x1080i : 1920x1080
[12/13 03:28:31.367] D/: + [3] 1920x1080i : 1920x1080
[12/13 03:28:31.367] D/: + [4] 1920x1080 : 1920x1080
[12/13 03:28:31.367] D/: + [5] 1920x1080i : 1920x1080
[12/13 03:28:31.367] D/: + [6] 1680x1050 : 1680x1050
[12/13 03:28:31.368] D/: + [7] 1280x1024 : 1280x1024
[12/13 03:28:31.368] D/: + [8] 1280x1024 : 1280x1024
[12/13 03:28:31.368] D/: + [9] 1440x900 : 1440x900
[12/13 03:28:31.368] D/: + [10] 1280x960 : 1280x960
[12/13 03:28:31.368] D/: + [11] 1280x720 : 1280x720
[12/13 03:28:31.368] D/: + [12] 1280x720 : 1280x720
[12/13 03:28:31.368] D/: + [13] 1280x720 : 1280x720
[12/13 03:28:31.368] D/: + [14] 1024x768 : 1024x768
[12/13 03:28:31.368] D/: + [15] 1024x768 : 1024x768
[12/13 03:28:31.368] D/: + [16] 1024x768 : 1024x768
[12/13 03:28:31.368] D/: + [17] 832x624 : 832x624
[12/13 03:28:31.369] D/: + [18] 800x600 : 800x600
[12/13 03:28:31.369] D/: + [19] 800x600 : 800x600
[12/13 03:28:31.369] D/: + [20] 800x600 : 800x600
[12/13 03:28:31.369] D/: + [21] 800x600 : 800x600
[12/13 03:28:31.369] D/: + [22] 720x576 : 720x576
[12/13 03:28:31.369] D/: + [23] 720x480 : 720x480
[12/13 03:28:31.369] D/: + [24] 720x480 : 720x480
[12/13 03:28:31.369] D/: + [25] 640x480 : 640x480
[12/13 03:28:31.369] D/: + [26] 640x480 : 640x480
[12/13 03:28:31.369] D/: + [27] 640x480 : 640x480
[12/13 03:28:31.369] D/: + [28] 640x480 : 640x480
[12/13 03:28:31.369] D/: + [29] 640x480 : 640x480
[12/13 03:28:31.370] D/: + [30] 720x400 : 720x400
[12/13 03:28:31.370] D/: End of Found
[12/13 03:28:31.601] D/: connecting to [0] mode [0] 1920x1088
[12/13 03:28:31.601] D/: found encoder id: 90
[12/13 03:28:31.601] D/: found crtc id: 64
[12/13 03:28:31.606] D/: set crts : crtc_id: 64
[12/13 03:28:31.607] D/: set crtc : encoder crtc_id: 0
[12/13 03:28:31.643] D/: [0]insert display buffer : 0x558a361f40
[12/13 03:28:31.646] D/: set crts : crtc_id: 64
[12/13 03:28:31.646] D/: set crtc : encoder crtc_id: 0
[12/13 03:28:31.659] D/: [1]insert display buffer : 0x558a3c61e0
[12/13 03:28:31.660] D/: OpenGLES initializing ...
[12/13 03:28:31.664] D/: * EGL_VERSION = 1.4 Midgard-"r13p0-00rel0" (have 22 configs)
[12/13 03:28:31.665] D/: getEglSurface 154 gbmSurface=0x7f9005b3f0
[12/13 03:28:31.671] D/: changeEglSurface 169 gbmSurface=0x7f9019fe40
[12/13 03:28:33.161] D/: drm render open ...
[12/13 03:28:34.743] D/: mMppCtx null or no init...
[12/13 03:28:34.743] D/: listening rtp port 10913
[12/13 03:28:34.743] D/: listening rtcp port 10914
[12/13 03:28:34.746] D/: curlto rtsp://192.168.2.95 , cli 10913:10923, tcp: 0
[12/13 03:28:34.765] D/: # Found [0] media: video
[12/13 03:28:34.766] D/: # Found [0] control: rtsp://192.168.2.95/trackID=1
[12/13 03:28:34.766] D/: # Found [0] rtpmap: id:96 format:H264 bitrate:90000
[12/13 03:28:34.766] D/: # Total found 1 channel(s).
[12/13 03:28:34.766] D/: TRACK [0] : rtsp://192.168.2.95/trackID=1 , format=1
[12/13 03:28:34.766] D/: setup 10913 , 10914, uri: rtsp://192.168.2.95/trackID=1
[12/13 03:28:34.813] D/: drm render open ...
[12/13 03:28:34.839] D/: Video SSRC Changed! 0 -> 2074585690
mpi: mpp version: Without VCS info
mpp_rt: NOT found ion allocator
mpp_rt: found drm allocator
[12/13 03:28:34.848] D/: aaaaaaaaaaaaaaa
[12/13 03:28:34.848] D/: 11111111
[12/13 03:28:34.848] D/: bbbbbbbbbbbbbb
[12/13 03:28:34.849] D/: aaaaaaaaaaaaaaa
[12/13 03:28:34.849] D/: bbbbbbbbbbbbbb
[12/13 03:28:34.880] D/: aaaaaaaaaaaaaaa
[12/13 03:28:34.881] D/: bbbbbbbbbbbbbb
[12/13 03:28:34.882] D/: aaaaaaaaaaaaaaa
[12/13 03:28:34.882] D/: bbbbbbbbbbbbbb
[12/13 03:28:34.882] D/: aaaaaaaaaaaaaaa
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