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# 前提
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1. 横琴海关处通过光纤连往公安处
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2. 流媒体服务器 44.49.76.117
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# 问题
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1. 视频点播花屏
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2. 视频点播超过三四路后点播失败
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## 调整摄像头参数（解决花屏）
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```
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码流类型：主码流
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视频类型：复合流 => 视频流
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分辨率：1080P
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码率类型：编码率 => 定码率
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图像质量：中
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视频帧率：15/20/25
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码率上限：1080P(2048* or 4096),720P(1024* or 2048)
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视频编码：H.264
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Smart264：关闭
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编码复杂度：高 => 低（能关闭最好关闭）
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I帧间隔：视频帧率*2
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SVC：关闭
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```
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## 修改 ffmpeg 参数（需要重新编译）
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```
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# https://blog.csdn.net/my_name_is_learn/article/details/107408551
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git clone https://git.ffmpeg.org/ffmpeg.git ffmpeg
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# or
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git clone -b release/5.0 https://github.com/FFmpeg/FFmpeg ffmpeg
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cd ffmpeg
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# 修改 udp.c 内的 UDP_MAX_PKT_SIZE 大小x10
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#define UDP_MAX_PKT_SIZE (65536 * 10)
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mkdir build
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cd build
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sudo apt install yasm
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../configure
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make -j4
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sudo make install
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```
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## jemalloc
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```
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# https://github.com/jemalloc/jemalloc
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# https://github.com/aerospike/jemalloc/blob/master/INSTALL
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wget https://github.com/jemalloc/jemalloc/releases/download/5.3.0/jemalloc-5.3.0.tar.bz2
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tar -xvf jemalloc-5.3.0.tar.bz2
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cd jemalloc-5.3.0/
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sudo apt -y install autogen autoconf
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./autogen.sh
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make -j4
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sudo make install
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sudo ldconfig
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ldconfig -v | grep jemalloc
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```
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## 调整 ZLMediaKit 参数
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```
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git clone https://github.com/ZLMediaKit/ZLMediaKit
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cd ZLMediaKit
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git submodule update --init
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sudo apt install -y build-essential cmake
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mkdir build-debug build-release
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cd build-debug
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# 调试过程使用 Debug 版本，正式使用最好使用 Release 版本（默认 Debug）
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cmake -DCMKAE_BUILD_TYPE=Debug ..
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cmake -DCMKAE_BUILD_TYPE=Release ..
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# or
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vim CMakeLists.txt
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SET(CMAKE_BUILD_TYPE "Debug”)
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SET(CMAKE_BUILD_TYPE "Release")
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cmake ..
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make -j4
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[api]
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apiDebug=1 => 0
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[general]
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wait_track_ready_ms=3000 => 30000
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wait_track_ready_ms=3000 => 30000
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# 按需取流，按需求配置
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[rtc]
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externIP= => 对接网卡ip
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```
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## 调整 linux 参数
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```
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# https://github.com/ZLMediaKit/ZLMediaKit/issues/1221
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# https://www.cnblogs.com/yorkyang/p/7689096.html
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# https://github.com/ZLMediaKit/ZLMediaKit/issues/961
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# https://codeantenna.com/a/GVZDrrzWI5
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# 调整内核参数
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cat /proc/sys/net/core/rmem_max
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cat /proc/sys/net/core/wmem_max
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## 212992(208KB)
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## 从 208KB 调整至 1MB
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## 临时修改
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su
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echo 1048576 > /proc/sys/net/core/rmem_max
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echo 1048576 > /proc/sys/net/core/wmem_max
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## 永久修改
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sudo vim /etc/sysctl.conf
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net.core.rmem_max = 1048576
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net.core.wmem_max = 1048576
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# 修改文件句柄数，添加参数
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## 临时修改
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ulimit -a
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ulimit -n 65536
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## 永久修改
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sudo vim /etc/security/limits.conf
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* soft nofile 32768
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* hard nofile 65536
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reboot
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ulimit -a
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```
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# 调试工具
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```
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# 安装调试工具
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sudo apt install -y linux-tools-common htop iftop
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sudo add-apt-repository ppa:wireshark-dev/stable
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sudo apt update
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sudo apt install wireshark
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# 查看系统信息
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top or htop
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# 查看网络连接
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netstat -tunlp
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# 查看带宽
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iftop
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# 查看 udp 丢包
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cat /proc/net/snmp | grep -w Udp
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# 网络抓包
|
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tcpdump #https://blog.csdn.net/weixin_36338224/article/details/107035214
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wireshark
|
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# 性能测试
|
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# https://github.com/zlmediakit/ZLMediaKit/wiki/Benchmark
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```
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