@@ -219,7 +219,10 @@ static int jacosub_read_header(AVFormatContext *s)

             break;

         case 'T': // ...but must be placed after TIMERES

             jacosub->timeres = strtol(p, NULL, 10);

-            av_bprintf(&header, "#T %s", p);

+            if (!jacosub->timeres)

+                jacosub->timeres = 30;

+            else

+                av_bprintf(&header, "#T %s", p);

             break;

         }

     }