tests/tools/examples: Replace direct exit() calls by return.

libavformat/output-example.c

@@ -445,7 +445,7 @@ int main(int argc, char **argv)
                "The output format is automatically guessed according to the file extension.\n"
                "Raw images can also be output by using '%%d' in the filename\n"
                "\n", argv[0]);
-        exit(1);
+        return 1;
     }
 
     filename = argv[1];
@@ -459,14 +459,14 @@ int main(int argc, char **argv)
     }
     if (!fmt) {
         fprintf(stderr, "Could not find suitable output format\n");
-        exit(1);
+        return 1;
     }
 
     /* allocate the output media context */
     oc = avformat_alloc_context();
     if (!oc) {
         fprintf(stderr, "Memory error\n");
-        exit(1);
+        return 1;
     }
     oc->oformat = fmt;
     snprintf(oc->filename, sizeof(oc->filename), "%s", filename);
@@ -486,7 +486,7 @@ int main(int argc, char **argv)
        parameters). */
     if (av_set_parameters(oc, NULL) < 0) {
         fprintf(stderr, "Invalid output format parameters\n");
-        exit(1);
+        return 1;
     }
 
     av_dump_format(oc, 0, filename, 1);
@@ -502,7 +502,7 @@ int main(int argc, char **argv)
     if (!(fmt->flags & AVFMT_NOFILE)) {
         if (avio_open(&oc->pb, filename, AVIO_FLAG_WRITE) < 0) {
             fprintf(stderr, "Could not open '%s'\n", filename);
-            exit(1);
+            return 1;
         }
     }