利用树莓派做一个简单的广告机
废话不多说开始
1. 安装 omxplayer
omxplayer 简易介绍：omxplayer是专门针对树莓派的GPU的播放器，支持硬件解码，最高支持分辨率是1080P，omxplayer这个命令行播放器，是专门针对树莓派优化了的GPU的播放器，支持硬件解码。支持格式：MKV、AVI、FLV、MP4。
鄙人亲自验证过，MP4格式视频文件播放流畅不卡顿
废话结束
安装
sudo apt-get install omxplayer
安装完毕
pi@raspberrypi:~ $ sudo apt-get install omxplayer
Reading package lists... Done
Building dependency tree... 50%
Building dependency tree
Reading state information... Done
omxplayer is already the newest version (20190723+gitf543a0d-1).
The following packages were automatically installed and are no longer required:
alsa-base gstreamer0.10-alsa gstreamer0.10-plugins-base libgstreamer-plugins-base0.10-0
libgstreamer0.10-0 libxfce4util-bin libxfce4util-common libxfce4util7 libxfconf-0-2
pimixer point-rpi vlc-l10n vlc-plugin-notify vlc-plugin-samba vlc-plugin-video-splitter
vlc-plugin-visualization xfconf
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 20 not upgraded.
因为我的树莓派已经安装过所以系统就跳过了
2. 测试 omxplayer
man omxplayer
OMXPLAYER(1) OMXPLAYER(1)
NAME
omxplayer - Raspberry Pi command line OMX player
OMXPlayer is a commandline OMX player for the Raspberry Pi. It was developed as a
testbed for the XBMC Raspberry PI implementation and is quite handy to use stand-
alone.
SYNOPSIS
Usage: omxplayer [OPTIONS] [FILE]
-h --help Print this help #打印帮助信息
-v --version Print version info #打印版本信息
-k --keys Print key bindings
-n --aidx index Audio stream index : e.g. 1
-o --adev device Audio out device : e.g. hdmi/local/both/alsa[:device]
-i --info Dump stream format and exit
-I --with-info dump stream format before playback
-s --stats Pts and buffer stats
-p --passthrough Audio passthrough
-d --deinterlace Force deinterlacing
--nodeinterlace Force no deinterlacing
--nativedeinterlace let display handle interlace
--anaglyph type convert 3d to anaglyph
--advanced[=0] Enable/disable advanced deinterlace for HD videos (default enabled)
-w --hw Hw audio decoding
-3 --3d mode Switch tv into 3d mode (e.g. SBS/TB)
-M --allow-mvc Allow decoding of both views of MVC stereo stream
-y --hdmiclocksync Display refresh rate to match video (default)
-z --nohdmiclocksync Do not adjust display refresh rate to match video
-t --sid index Show subtitle with index
-r --refresh Adjust framerate/resolution to video
-g --genlog Generate log file
-l --pos n Start position (hh:mm:ss)
-b --blank[=0xAARRGGBB] Set the video background color to black (or optional ARGB value)
--loop Loop file. Ignored if file not seekable
--no-boost-on-downmix Don't boost volume when downmixing
--vol n set initial volume in millibels (default 0)
--amp n set initial amplification in millibels (default 0)
--no-osd Do not display status information on screen
--no-keys Disable keyboard input (prevents hangs for certain TTYs)
--subtitles path External subtitles in UTF-8 srt format
--font path Default: /usr/share/fonts/truetype/freefont/FreeSans.ttf
--italic-font path Default: /usr/share/fonts/truetype/freefont/FreeSansOblique.ttf
--font-size size Font size in 1/1000 screen height (default: 55)
--align left/center Subtitle alignment (default: left)
--no-ghost-box No semitransparent boxes behind subtitles
--lines n Number of lines in the subtitle buffer (default: 3)
--win 'x1 y1 x2 y2' Set position of video window
--win x1,y1,x2,y2 Set position of video window
--crop 'x1 y1 x2 y2' Set crop area for input video
--crop x1,y1,x2,y2 Set crop area for input video
--aspect-mode type Letterbox, fill, stretch. Default: stretch if win is specified, letterbox otherwise
--audio_fifo n Size of audio output fifo in seconds
--video_fifo n Size of video output fifo in MB
--audio_queue n Size of audio input queue in MB
--video_queue n Size of video input queue in MB
--threshold n Amount of buffered data required to finish buffering [s]
--timeout n Timeout for stalled file/network operations (default 10s)
--orientation n Set orientation of video (0, 90, 180 or 270)
--fps n Set fps of video where timestamps are not present
--live Set for live tv or vod type stream
--layout Set output speaker layout (e.g. 5.1)
--dbus_name name default: org.mpris.MediaPlayer2.omxplayer
--key-config <file> Uses key bindings in <file> instead of the default
--alpha Set video transparency (0..255)
--layer n Set video render layer number (higher numbers are on top)
--display n Set display to output to
--cookie 'cookie' Send specified cookie as part of HTTP requests
--user-agent 'ua' Send specified User-Agent as part of HTTP requests
--lavfdopts 'opts' Options passed to libavformat, e.g. 'probesize:250000,...'
--avdict 'opts' Options passed to demuxer, e.g., 'rtsp_transport:tcp,...'
For example:
./omxplayer -p -o hdmi test.mkv
#下面是播放时使用，键盘按键使用
KEY BINDINGS
Key bindings to control omxplayer while playing:
1 decrease speed
2 increase speed
< rewind
> fast forward
z show info
j previous audio stream
k next audio stream
i previous chapter
o next chapter
n previous subtitle stream
m next subtitle stream
s toggle subtitles
w show subtitles
x hide subtitles
d decrease subtitle delay (- 250 ms)
f increase subtitle delay (+ 250 ms)
q exit omxplayer
p / space pause/resume
- decrease volume
+ / = increase volume
left arrow seek -30 seconds
right arrow seek +30 seconds
down arrow seek -600 seconds
up arrow seek +600 seconds
KEY CONFIG SYNTAX
A key config file is a series of rules of the form [action]:[key]. Multiple keys can
be bound to the same action, and comments are supported by adding a # in front of
the line. The list of valid [action]s roughly corresponds to the list of default
key bindings above and are:
DECREASE_SPEED
INCREASE_SPEED
REWIND
FAST_FORWARD
SHOW_INFO
PREVIOUS_AUDIO
NEXT_AUDIO
PREVIOUS_CHAPTER
NEXT_CHAPTER
PREVIOUS_SUBTITLE
NEXT_SUBTITLE
TOGGLE_SUBTITLE
DECREASE_SUBTITLE_DELAY
INCREASE_SUBTITLE_DELAY
EXIT
PAUSE
DECREASE_VOLUME
INCREASE_VOLUME
SEEK_BACK_SMALL
SEEK_FORWARD_SMALL
SEEK_BACK_LARGE
SEEK_FORWARD_LARGE
STEP
Valid [key]s include all alpha-numeric characters and most symbols, as well as:
left
right
up
down
esc
hex [keycode]
For example:
EXIT:esc
PAUSE:p
#Note that this next line has a space after the :
PAUSE:
REWIND:left
SEEK_FORWARD_SMALL:hex 0x4f43
EXIT:q
August 2019 OMXPLAYER(1)
以上是 omxplayer 打印的功能信息
我们举一个简单的例子：
omxplayer -o hdmi ruguodangshi.mp4
这段话的意思是输出音频流到本机的HDMI设备，同时使用HDMI播放视频
pi@raspberrypi:~/pilearn/play $ ls
gaobaiqiqiu.mp4 huanting.mp4 luzhouyue.mp4 play.sh ruguodangshi.mp4
pi@raspberrypi:~/pilearn/play $ omxplayer -o hdmi ruguodangshi.mp4
/bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
Video codec omx-h264 width 640 height 480 profile 77 fps 23.976025
Audio codec aac channels 2 samplerate 22050 bitspersample 16
Subtitle count: 0, state: off, index: 1, delay: 0
V:PortSettingsChanged: 640x480@23.98 interlace:0 deinterlace:0 anaglyph:0 par:1.00 display:0 layer:0 alpha:255 aspectMode:0
视频成功输出到HDMI后，使用显示器（支持HDMI音频播放）测试，不出意外后就能成功显示视频和音乐。
到此 omxplayer 安装大功告成，下一步进行shell脚本编写