Add a check in the case more than one input file is provided to ffplay, make...

Add a check in the case more than one input file is provided to ffplay, make it complains and abort as just one input file is supported.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@22139 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

ffplay.c

@@ -2671,6 +2671,11 @@ static void show_help(void)
 
 static void opt_input_file(const char *filename)
 {
+    if (input_filename) {
+        fprintf(stderr, "Argument '%s' provided as input filename, but '%s' was already specified.\n",
+                filename, input_filename);
+        exit(1);
+    }
     if (!strcmp(filename, "-"))
         filename = "pipe:";
     input_filename = filename;