Set DASH fragment max duration and fixed manifest.

Author: arut

dash/ngx_rtmp_dash_module.c

@@ -252,7 +252,6 @@ ngx_rtmp_dash_write_playlist(ngx_rtmp_session_t *s)
         return NGX_ERROR;
     }
 
-
 #define NGX_RTMP_DASH_MANIFEST_HEADER                                          \
     "<?xml version=\"1.0\"?>\n"                                                \
     "<MPD\n"                                                                   \
@@ -357,8 +356,13 @@ ngx_rtmp_dash_write_playlist(ngx_rtmp_session_t *s)
                      start_time,
                      pub_time,
                      (ngx_uint_t) (dacf->fraglen / 1000),
-                     (ngx_uint_t) (dacf->fraglen / 500),
-                     (ngx_uint_t) (dacf->playlen / 1000));
+                     (ngx_uint_t) (dacf->fraglen / 1000),
+                     (ngx_uint_t) (dacf->fraglen / 250 + 1));
+
+    /*
+     * timeShiftBufferDepth formula:
+     *     2 * minBufferTime + max_fragment_length + 1
+     */
 
     n = ngx_write_fd(fd, buffer, p - buffer);
 
@@ -994,6 +998,11 @@ ngx_rtmp_dash_update_fragments(ngx_rtmp_session_t *s, ngx_int_t boundary,
         f->duration = timestamp - f->timestamp;
         hit = (f->duration >= dacf->fraglen);
 
+        /* keep fragment lengths within 2x factor for dash.js  */
+        if (f->duration >= dacf->fraglen * 2) {
+            boundary = 1;
+        }
+
     } else {
 
         /* sometimes clients generate slightly unordered frames */