doc/examples/demuxing_decoding: drop -refcount

Non-refcounted frames are deprecated and there is no good reason to use
them.

doc/examples/demuxing_decoding.c

@@ -55,12 +55,6 @@ static AVPacket pkt;
 static int video_frame_count = 0;
 static int audio_frame_count = 0;
 
-/* Enable or disable frame reference counting. You are not supposed to support
- * both paths in your application but pick the one most appropriate to your
- * needs. Look for the use of refcount in this example to see what are the
- * differences of API usage between them. */
-static int refcount = 0;
-
 static int decode_packet(int *got_frame, int cached)
 {
     int ret = 0;
@@ -138,9 +132,7 @@ static int decode_packet(int *got_frame, int cached)
         }
     }
 
-    /* If we use frame reference counting, we own the data and need
-     * to de-reference it when we don't use it anymore */
-    if (*got_frame && refcount)
+    if (*got_frame)
         av_frame_unref(frame);
 
     return decoded;
@@ -186,8 +178,7 @@ static int open_codec_context(int *stream_idx,
             return ret;
         }
 
-        /* Init the decoders, with or without reference counting */
-        av_dict_set(&opts, "refcounted_frames", refcount ? "1" : "0", 0);
+        /* Init the decoders */
         if ((ret = avcodec_open2(*dec_ctx, dec, &opts)) < 0) {
             fprintf(stderr, "Failed to open %s codec\n",
                     av_get_media_type_string(type));
@@ -232,22 +223,15 @@ int main (int argc, char **argv)
 {
     int ret = 0, got_frame;
 
-    if (argc != 4 && argc != 5) {
-        fprintf(stderr, "usage: %s [-refcount] input_file video_output_file audio_output_file\n"
+    if (argc != 4) {
+        fprintf(stderr, "usage: %s  input_file video_output_file audio_output_file\n"
                 "API example program to show how to read frames from an input file.\n"
                 "This program reads frames from a file, decodes them, and writes decoded\n"
                 "video frames to a rawvideo file named video_output_file, and decoded\n"
-                "audio frames to a rawaudio file named audio_output_file.\n\n"
-                "If the -refcount option is specified, the program use the\n"
-                "reference counting frame system which allows keeping a copy of\n"
-                "the data for longer than one decode call.\n"
-                "\n", argv[0]);
+                "audio frames to a rawaudio file named audio_output_file.\n",
+                argv[0]);
         exit(1);
     }
-    if (argc == 5 && !strcmp(argv[1], "-refcount")) {
-        refcount = 1;
-        argv++;
-    }
     src_filename = argv[1];
     video_dst_filename = argv[2];
     audio_dst_filename = argv[3];