記錄華為云的上云操作及OBS物件上傳檔案等操作，大部分操作在WSL Ubuntu中完成，與樹莓派環境基本一致，
linux作業系統連接華為云
參考這篇檔案：Linux配置上云環境及demo
上傳TOPIC
/*
Topic: $oc/devices/{device_id}/sys/messages/up
資料格式：
{
"object_device_id": "{object_device_id}",
"name": "name",
"id": "id",
"content": "hello"
}
"{\"object_device_id\": \"{object_device_id}\",\"name\": \"name\",\"id\": \"id\",\"content\": \"hello\"}"
*/
payload = "{\"object_device_id\": \"5ed4fd4c41f4fc02c74fdd27_0\",\"name\": \"massage_test\",\"id\": \"0xffffff\",\"content\": \"Hello, Huawei Yun\"}";
char *cmd_topic = combine_strings(3, "$oc/devices/", username, "/sys/messages/up");
// ret = mqtt_subscribe(cmd_topic);
ret = mqtt_publish(cmd_topic, payload);
free(cmd_topic);
cmd_topic = NULL;
if (ret < 0)
{
printf("subscribe topic error, result %d\n", ret);
}
接收云端下發的命令
首先在產品->功能定義->添加命令中設定一個命令，再在設備->所有設備->設備詳情->命令->命令下發中發送命令，
BUG
- 樹莓派上傳屬性有時間無法讀取bug
- 資料決議有問題
OBS物件創建
Windows安裝OBS Browser+
在使用OBS前，首先申請一個捅，并在查看密鑰這里申請訪問的AK和SK以便之后登陸使用，下載安裝，登陸時賬號可以任意配置，填上AK和SK即可，
linux安裝obsutil
下載和初始化配置參考：初始化配置
以本人創建的sjlbowl為例，主要運行步驟：
? Huawei_cloud_demo tar xvf obsutil_linux_amd64.tar.gz
obsutil_linux_amd64_3.1.15/
obsutil_linux_amd64_3.1.15/setup.sh
obsutil_linux_amd64_3.1.15/obsutil
? Huawei_cloud_demo cd obsutil_linux_amd64_3.1.15
? obsutil_linux_amd64_3.1.15 chmod 755 obsutil
? obsutil_linux_amd64_3.1.15 ls
obsutil setup.sh
? obsutil_linux_amd64_3.1.15 ./obsutil config -i=********************** -k=********************** -e=**********************
Config file url:
/home/sjl/.obsutilconfig
Update config file successfully!
? obsutil_linux_amd64_3.1.15 ./obsutil ls -s
Start at 2020-06-16 05:53:26.3593567 +0000 UTC
obs://sjlbowl
Bucket number is: 1
? obsutil_linux_amd64_3.1.15 ./obsutil ls obs://sjlbowl -s
Start at 2020-06-16 05:53:48.4628515 +0000 UTC
Listing objects .
Object list:
obs://sjlbowl/63254f37ca35ea6e8b5e803c86705367.jpg
Total size of bucket is: 2.56MB
Folder number is: 0
File number is: 1
? obsutil_linux_amd64_3.1.15 ls
obsutil setup.sh
? obsutil_linux_amd64_3.1.15 touch test.txt
? obsutil_linux_amd64_3.1.15 vim test.txt
? obsutil_linux_amd64_3.1.15 ./obsutil cp test.txt obs://sjlbowl
Start at 2020-06-16 05:55:42.5142311 +0000 UTC
Parallel: 5 Jobs: 5
Threshold: 50.00MB PartSize: auto
VerifyLength: false VerifyMd5: false
CheckpointDir: /home/sjl/.obsutil_checkpoint
[------------------------------------------------] 100.00% 137B/s 33B/33B 442ms
Upload successfully, 33B, n/a, /mnt/f/Huawei_cloud_demo/obsutil_linux_amd64_3.1.15/test.txt --> obs://sjlbowl/test.txt, cost [442], status [200], request id [00000172BBB2983E681D6BC627C5CB01]
樹莓派安裝obsutil環境
需要安裝golang環境及編譯obsutil檔案：
git clone https://github.com/huaweicloud/huaweicloud-obs-obsutil.git # 下載原始碼
cd huaweicloud-obs-obsutil/
sudo apt-get install golang # 安裝golang
export GOPATH=/home/pi/huawei/huaweicloud-obs-obsutil # 設定路徑
export CGO_ENABLED=0
export GOOS=linux # 設定目標系統
export GOARCH=arm # 設定目標處理器
go install -ldflags "-X main.AesKey=<your aes key of which the length must be 16> -X main.AesIv=<your aes iv of which the length must be 16> -X main.CloudType=dt" obsutil
go build obsutil # 編譯檔案
go run obsutil # 生成當前環境可執行版本
./obsutil config -i=********************** -k=********************** -e=**********************
./obsutil ls -s
./obsutil ls obs://my-bucket-input -s
./obsutil cp ../../face_from_raspberry.jpg obs://my-bucket-input # 上傳檔案
樹莓派傳輸視頻流
硬體連接
紅外攝像頭：
更新Picamera驅動并使用下面檔案測驗：
from picamera import PiCamera
from time import sleep
import time
camera = PiCamera()
camera.resolution=(720,480)
def take_photo():
ticks=int(time.time())
fileName='raspi%s.jpg'%ticks
filePath='/home/pi/iot/photos/%s'%fileName
camera.start_preview()
for i in range(10,0,-1): # 10s倒計時
camera.annotate_text='%d'%i
# camera.annotate_text='%s'%filePath
sleep(1)
camera.annotate_text=''
camera.capture(filePath)
camera.stop_preview()
take_photo() # 拍一次
云端設定RTMP推流地址
打開控制臺，搜索視頻接入服務，開通后創建RTMP視頻流，激活后可以查看到RTMP推流地址：
rtmp://121.36.222.36:25021/vis/raspberry
參考：創建RTMP視頻流
樹莓派安裝ffmpeg和nginx工具
安裝ffmpeg：
sudo apt-get update
sudo apt-get install libx264-dev
wget http://ffmpeg.org/releases/ffmpeg-4.1.tar.bz2
sudo tar jxvf ffmpeg-4.1.tar.bz2
cd ffmpeg-4.1/
sudo ./configure --prefix=/opt/ffmpeg --enable-shared --enable-pthreads --enable-gpl --enable-avresample --enable-libx264 --disable-yasm
sudo make && sudo make install
安裝和配置nginx：
# 下載解壓nginx-rtmp-module模塊
cd ~
wget https://github.com/arut/nginx-rtmp-module/archive/master.zip
unzip master.zip
# 下載解壓openresty模塊
cd ~
wget https://openresty.org/download/openresty-1.13.6.2.tar.gz
tar xvf openresty-1.13.6.2.tar.gz
mv openresty-1.13.6.2 openresty
cd openresty
sudo ./configure --prefix=/opt/openresty --add-module=/home/pi/nginx-rtmp-module-master
# 安裝編譯nginx
sudo make
sudo make install
# 創建快捷方式
sudo ln -s /opt/openresty/nginx/sbin/nginx /usr/sbin/nginx
# 修改組態檔
sudo vim /opt/openresty/nginx/conf/nginx.conf
# 添加：
rtmp {
server {
listen 1935;
application videotest{
live on;
}
}
}
推流實作
# 命令：
raspivid -w 640 -h 480 -b 15000000 -t 0 -a 12 -a 1024 -a "CAM-1 %Y-%m-%d %X" -ae 18,0xff,0x808000 -o - | ffmpeg -re -i - -s 640x480 -vcodec copy -acodec copy -b:v 800k -b:a 32k -f flv rtmp://121.36.222.36:25021/vis/raspberry
# 結果：
Input #0, h264, from 'pipe:':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: h264 (High), yuv420p(progressive), 640x480, 25 fps, 25 tbr, 1200k tbn, 50 tbc
Output #0, flv, to 'rtmp://121.36.222.36:25021/vis/raspberry':
Metadata:
encoder : Lavf58.20.100
Stream #0:0: Video: h264 (High) ([7][0][0][0] / 0x0007), yuv420p(progressive), 640x480, q=2-31, 800 kb/s, 25 fps, 25 tbr, 1k tbn, 1200k tbc
Stream mapping:
Stream #0:0 -> #0:0 (copy)
[flv @ 0xae96e0] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
^Cmmal: Aborting program.0 size= 18177kB time=00:01:25.72 bitrate=1737.1kbits/s speed= 1x
[flv @ 0xae96e0] Failed to update header with correct duration.
[flv @ 0xae96e0] Failed to update header with correct filesize.
frame= 2154 fps= 25 q=-1.0 Lsize= 18220kB time=00:01:26.12 bitrate=1733.1kbits/s speed= 1x
video:18178kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.232961%
實際測驗延遲在15s-20s之間（4G熱點網路）：
參考：【樹莓派】ffmpeg + nginx 推 rtmp 視頻流實作遠程監控
安裝opencv指北
本來打算用opencv做視頻流，發現樹莓派開啟cv后就很卡，遂放棄，但安裝opencv的痛苦歷程值得記錄，不過只要參考下面兩個就夠了，如果遇到頭檔案錯誤就復制一下改路徑，如果遇到make -j4卡死到99%，切換成make就行，并提高swap的交換磁區大小，缺少bmi型別檔案去網上搜一下就行，這些困難不是大事，等cpu編譯完才是望眼欲穿，
樹莓派3B/3B+和4B安裝OpenCV教程 (詳細教程)
教你在樹莓派上安裝OpenCV
轉載請註明出處，本文鏈接：https://www.uj5u.com/ruanti/291434.html
標籤：其他