TI中文支持网根据用户向导手册，用apt-get 安装mplayer后，执行python MplayerTest.py后无法播放视频？其具体执行情况如下所示：
machinekit@beaglebone:/opt/scripts/device/bone/capes/DLPDLCR2000$ python MplayerTest.py
set slave address: 27
Make sure the display port is set. For example export DISPLAY=:0
1
SourceSel.EXTERNAL_VIDEO_PARALLEL_I_F_
2
Resolution.NHD_LANDSCAPE
##################################################################
play video
nhd_test.mp4
MPlayer2 2.0-728-g2c378c7-4+b1 (C) 2000-2012 MPlayer Team
Cannot open file '/home/machinekit/.mplayer/input.conf': No such file or directory
Failed to open /home/machinekit/.mplayer/input.conf.
Cannot open file '/etc/mplayer/input.conf': No such file or directory
Failed to open /etc/mplayer/input.conf.
Playing nhd_test.mp4.
Detected file format: QuickTime / MOV (libavformat)
[lavf] stream 0: video (h264), -vid 0
Clip info:
major_brand: mp42
minor_version: 1
compatible_brands: mp42avc1
creation_time: 2017-07-07 14:32:35
Load subtitles in .
vo: couldn't open the X11 display (:0)!
vo: couldn't open the X11 display (:0)!
vo: couldn't open the X11 display (:0)!
commandline read: mplayer
commandline read: -fs
commandline read: nhd_test.mp4
~~~~~~~~~~~~~~~~~~~~~~~~~~| DirectFB 1.2.10 |~~~~~~~~~~~~~~~~~~~~~~~~~~
(c) 2001-2008 The world wide DirectFB Open Source Community
(c) 2000-2004 Convergence (integrated media) GmbH
—————————————————————-
(*) DirectFB/Core: Single Application Core. (2014-10-21 10:21)(!) Direct/Util: opening '/dev/fb0' and '/dev/fb/0' failed
–> No such file or directory
(!) DirectFB/FBDev: Error opening framebuffer device!
(!) DirectFB/FBDev: Use 'fbdev' option or set FRAMEBUFFER environment variable.
(!) DirectFB/Core: Could not initialize 'system_core' core!
–> Initialization error!
vo: couldn't open the X11 display (:0)!
~~~~~~~~~~~~~~~~~~~~~~~~~~| DirectFB 1.2.10 |~~~~~~~~~~~~~~~~~~~~~~~~~~
(c) 2001-2008 The world wide DirectFB Open Source Community
(c) 2000-2004 Convergence (integrated media) GmbH
—————————————————————-
(*) DirectFB/Core: Single Application Core. (2014-10-21 10:21)(!) Direct/Util: opening '/dev/fb0' and '/dev/fb/0' failed
–> No such file or directory
(!) DirectFB/FBDev: Error opening framebuffer device!
(!) DirectFB/FBDev: Use 'fbdev' option or set FRAMEBUFFER environment variable.
(!) DirectFB/Core: Could not initialize 'system_core' core!
–> Initialization error!
vo: couldn't open the X11 display (:0)!
~~~~~~~~~~~~~~~~~~~~~~~~~~| DirectFB 1.2.10 |~~~~~~~~~~~~~~~~~~~~~~~~~~
(c) 2001-2008 The world wide DirectFB Open Source Community
(c) 2000-2004 Convergence (integrated media) GmbH
—————————————————————-
(*) DirectFB/Core: Single Application Core. (2014-10-21 10:21)(!) Direct/Util: opening '/dev/fb0' and '/dev/fb/0' failed
–> No such file or directory
(!) DirectFB/FBDev: Error opening framebuffer device!
(!) DirectFB/FBDev: Use 'fbdev' option or set FRAMEBUFFER environment variable.
(!) DirectFB/Core: Could not initialize 'system_core' core!
–> Initialization error!
[VO_SDL] SDL initialization failed: DirectFBCreate: Initialization error!.
vo_caca: failed to initialize
VO: [v4l2] No such file or directory
[ass] auto-open
Selected video codec: H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 [libavcodec]
Audio: no sound
Starting playback…
VIDEO: 640×360 30.000 fps 3600.5 kbps (450.1 kB/s)
VO: [null] 640×360 => 640×360 Planar YV12 [fs]
V: 0.0 0/ 0 ??% ??% ??,?% 0 0Dead key input on file descriptor 0
V: 22.9 0/ 0 203% 23% 0.0% 0 0
Exiting… (End of file)
None
Does the video play on the screen? (Pass/Fail/Stop) (Pass/Fail/Stop) and comment: Test passed
Kevin Shi：
您好！
您可以尝试使用mplayer手动播放视频，看是否可以正常工作。
如果无法正常工作应该是播放器安装的问题，您可以尝试使用root权限重新安装和播放。
user5687849：
回复 Kevin Shi:
你好！
我用VNC远程登录BB-Black桌面，使用如下命令 sudo mplayer nhd_test.mp4可以在远程桌面上看到nhd_test.mp4视频的播放，但是投影仪投影的画面还是projector的开机画面，使用命令export DISPLAY=:0 和命令python MplayerTest.py后，远程桌面没有出现视频，投影仪还是projector的开机画面。
使用命令i2cdetect -l显示如下：
debian@beaglebone:/opt/scripts/device/bone/capes/DLPDLCR2000$ i2cdetect -l
i2c-2i2cOMAP I2C adapterI2C adapter
i2c-0i2cOMAP I2C adapterI2C adapter
debian@beaglebone:/opt/scripts/device/bone/capes/DLPDLCR2000$ i2cdetect -y -r 20123456789abcdef
00:– — — — — — — — — — — — —
10: — — — — — — — — — — — 1b — — — —
20: — — — — — — — — — — — — — — — —
30: — — — — — — — — — — — — — — — —
40: — — — — — — — — — — — — — — — —
50: — — — — UU UU UU UU — — — — — — — —
60: — — — — — — — — — — — — — — — —
70: — — — — — — — —
debian@beaglebone:/opt/scripts/device/bone/capes/DLPDLCR2000$ i2cset -y 2 0x1b 0x0b 0x00 0x00 0x00 0x00 i
debian@beaglebone:/opt/scripts/device/bone/capes/DLPDLCR2000$ i2cset -y 2 0x1b 0x0c 0x00 0x00 0x00 0x1b i
debian@beaglebone:/opt/scripts/device/bone/capes/DLPDLCR2000$
也把48脚设置为输出高电平了，但是投影仪还是没反应，这个是怎么回事呢？
Kevin Shi：
回复 user5687849:
怀疑您的I2C没有正常工作，请确认BB-black和DLP2000 EVM之间的充分连接，可以检查硬件通路上是否正常。
根据编程手册发送检单的I2C命令，看是否有工作，比如切换信号源到内部的pattern，做图片的反转等
user5687849：
回复 Kevin Shi:
你好！就是我在使用dlpdlcr2000evm模块时，出现了以下问题，当SD卡装8.9系统时，使用i2cset命令可以切换视频源，但是用apt-get 安装的播放器mplayer无法播放视频；当SD卡装9.1及以上的系统时，用apt-get下载的mplayer可以实现视频的手动播放，但是发送i2cset命令无效，及无法实现外部信号源的切换。
