location ~* \.(mp4|avi|flv|mkv)$ {

mp4;
mp4_buffer_size 256k;
mp4_max_buffer_size 1m;
directio 128k;
directio_alignment 4k;
output_buffers 1 2m;
slice 8m;
proxy_cache                     cdncache;
proxy_set_header               X-Real-IP $remote_addr;
proxy_set_header               X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_ignore_headers        Set-Cookie;
proxy_ignore_headers        Cache-Control;
proxy_buffer_size               128k;
proxy_buffers                     128 4k;
proxy_busy_buffers_size     128k;
proxy_connect_timeout       600s;
proxy_send_timeout            600s;
proxy_read_timeout            600s;
proxy_cache_lock on;
proxy_cache_min_uses           1;
proxy_buffering                     on;
proxy_intercept_errors           off;
proxy_cache_key                    $host$uri$is_args$args$slice_range;
proxy_set_header                   Range $slice_range;
proxy_http_version                 1.1;
proxy_cache_lock_age            200s;
proxy_cache_use_stale           updating;
proxy_cache_lock_timeout     0s;
proxy_force_ranges                on;
proxy_cache_use_stale error timeout http_500 http_502 http_503 http_504;
proxy_cache_valid 200 201 206 13d;
proxy_cache_valid 300 301 302 303 304 0s;
proxy_cache_valid 400 415 414 406 405 404 3s;
proxy_cache_valid 500 501 502 550 503 1s;
proxy_cache_valid any 0s;
proxy_pass http://backend;
}