原因：

使用优化线路反代EMBY，播放时 疯狂拉满宽带并且视频卡顿

解决：
加入以下参数

proxy_buffering off;
proxy_cache off;

我的宝塔反代配置示例

#PROXY-START/

location ^~ /
{
    proxy_pass http://123.8.5.6:8096;
    proxy_set_header Host 123.8.5.6;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header REMOTE-HOST $remote_addr;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $connection_upgrade;
    proxy_http_version 1.1;
    proxy_buffering off;
    proxy_cache off;
    # proxy_hide_header Upgrade;

    add_header X-Cache $upstream_cache_status;

    #Set Nginx Cache
    
    
    set $static_fileyCbwxXaR 0;
    if ( $uri ~* "\.(gif|png|jpg|css|js|woff|woff2)$" )
    {
        set $static_fileyCbwxXaR 1;
        expires 1m;
        }
    if ( $static_fileyCbwxXaR = 0 )
    {
    add_header Cache-Control no-cache;
    }
}

#PROXY-END/

套cf建议参考

https://emby.media/community/index.php?/topic/103165-how-to-recommended-cloudflare-settings/

规则1 开启图片缓存

域名/emby/Items/*/Images/*

规则2 禁用视频缓存

域名/emby/videos/*/*

公益服

proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

公益服大部分禁用国内ip，所以这两条我一般都注释掉：