diff --git a/src/http/modules/ngx_http_flv_module.c b/src/http/modules/ngx_http_flv_module.c
index 3cc7d81..2197b6c 100644
--- a/src/http/modules/ngx_http_flv_module.c
+++ b/src/http/modules/ngx_http_flv_module.c
@@ -60,12 +60,12 @@
 static ngx_int_t
 ngx_http_flv_handler(ngx_http_request_t *r)
 {
-    u_char                    *p, *n, *last;
+    u_char                    *last;
     off_t                      start, len;
     size_t                     root;
     ngx_int_t                  rc;
     ngx_uint_t                 level, i;
-    ngx_str_t                  path;
+    ngx_str_t                  path, value;
     ngx_log_t                 *log;
     ngx_buf_t                 *b;
     ngx_chain_t                out[2];
@@ -167,18 +167,10 @@
     i = 1;
 
     if (r->args.len) {
-        p = (u_char *) ngx_strnstr(r->args.data, "start=", r->args.len);
 
-        if (p) {
-            p += 6;
+        if (ngx_http_arg(r, (u_char *) "start", 5, &value) == NGX_OK) {
 
-            for (n = p; n < r->args.data + r->args.len; n++) {
-                if (*n == '&') {
-                    break;
-                }
-            }
-
-            start = ngx_atoof(p, n - p);
+            start = ngx_atoof(value.data, value.len);
 
             if (start == NGX_ERROR || start >= len) {
                 start = 0;
diff --git a/src/http/ngx_http.h b/src/http/ngx_http.h
index 8c07a90..cac2a9c 100644
--- a/src/http/ngx_http.h
+++ b/src/http/ngx_http.h
@@ -76,6 +76,9 @@
     ngx_uint_t allow_underscores);
 ngx_int_t ngx_http_parse_multi_header_lines(ngx_array_t *headers,
     ngx_str_t *name, ngx_str_t *value);
+ngx_int_t ngx_http_arg(ngx_http_request_t *r, u_char *name, size_t len,
+    ngx_str_t *value);
+
 
 ngx_int_t ngx_http_find_server_conf(ngx_http_request_t *r);
 void ngx_http_update_location_config(ngx_http_request_t *r);
diff --git a/src/http/ngx_http_parse.c b/src/http/ngx_http_parse.c
index b08d5ea..f31df7b 100644
--- a/src/http/ngx_http_parse.c
+++ b/src/http/ngx_http_parse.c
@@ -1481,3 +1481,45 @@
 
     return NGX_DECLINED;
 }
+
+
+ngx_int_t
+ngx_http_arg(ngx_http_request_t *r, u_char *name, size_t len, ngx_str_t *value)
+{
+    u_char  *p;
+
+    if (r->args.len == 0) {
+        return NGX_DECLINED;
+    }
+
+    for (p = r->args.data; *p && *p != ' '; p++) {
+
+        /*
+         * although r->args.data is not null-terminated by itself,
+         * however, there is null in the end of request line
+         */
+
+        p = ngx_strcasestrn(p, (char *) name, len - 1);
+
+        if (p == NULL) {
+            return NGX_DECLINED;
+        }
+
+        if ((p == r->args.data || *(p - 1) == '&') && *(p + len) == '=') {
+
+            value->data = p + len + 1;
+
+            p = (u_char *) ngx_strchr(p, '&');
+
+            if (p == NULL) {
+                p = r->args.data + r->args.len;
+            }
+
+            value->len = p - value->data;
+
+            return NGX_OK;
+        }
+    }
+
+    return NGX_DECLINED;
+}
diff --git a/src/http/ngx_http_variables.c b/src/http/ngx_http_variables.c
index 998c4ce..52584c3 100644
--- a/src/http/ngx_http_variables.c
+++ b/src/http/ngx_http_variables.c
@@ -772,51 +772,23 @@
 {
     ngx_str_t *name = (ngx_str_t *) data;
 
-    u_char  *p, *arg;
-    size_t   len;
+    u_char     *arg;
+    size_t      len;
+    ngx_str_t   value;
 
-    if (r->args.len == 0) {
+    len = name->len - (sizeof("arg_") - 1);
+    arg = name->data + sizeof("arg_") - 1;
+
+    if (ngx_http_arg(r, arg, len, &value) != NGX_OK) {
         v->not_found = 1;
         return NGX_OK;
     }
 
-    len = name->len - 1 - (sizeof("arg_") - 1);
-    arg = name->data + sizeof("arg_") - 1;
-
-    for (p = r->args.data; *p && *p != ' '; p++) {
-
-        /*
-         * although r->args.data is not null-terminated by itself,
-         * however, there is null in the end of request line
-         */
-
-        p = ngx_strcasestrn(p, (char *) arg, len);
-
-        if (p == NULL) {
-            v->not_found = 1;
-            return NGX_OK;
-        }
-
-        if ((p == r->args.data || *(p - 1) == '&') && *(p + len + 1) == '=') {
-
-            v->data = p + len + 2;
-
-            p = (u_char *) ngx_strchr(p, '&');
-
-            if (p == NULL) {
-                p = r->args.data + r->args.len;
-            }
-
-            v->len = p - v->data;
-            v->valid = 1;
-            v->no_cacheable = 0;
-            v->not_found = 0;
-
-            return NGX_OK;
-        }
-    }
-
-    v->not_found = 1;
+    v->data = value.data;
+    v->len = value.len;
+    v->valid = 1;
+    v->no_cacheable = 0;
+    v->not_found = 0;
 
     return NGX_OK;
 }