Merge commit '7748dd41'

* commit '7748dd41':
  avconv: add -n option to immediately exit when output files already exist

Conflicts:
	Changelog
	doc/ffmpeg.texi
	ffmpeg_opt.c

See: 0a4f0211Merged-by: Michael Niedermayer <michaelni@gmx.at>

ffmpeg_opt.c

@@ -659,11 +659,16 @@ static void add_input_streams(OptionsContext *o, AVFormatContext *ic)
 
 static void assert_file_overwrite(const char *filename)
 {
-    if ((!file_overwrite || no_file_overwrite) &&
+    if (file_overwrite && no_file_overwrite) {
+        fprintf(stderr, "Error, both -y and -n supplied. Exiting.\n");
+        exit_program(1);
+    }
+
+    if (!file_overwrite &&
         (strchr(filename, ':') == NULL || filename[1] == ':' ||
          av_strstart(filename, "file:", NULL))) {
         if (avio_check(filename, 0) == 0) {
-            if (stdin_interaction && (!no_file_overwrite || file_overwrite)) {
+            if (stdin_interaction && !no_file_overwrite) {
                 fprintf(stderr,"File '%s' already exists. Overwrite ? [y/N] ", filename);
                 fflush(stderr);
                 term_exit();
@@ -2578,7 +2583,7 @@ const OptionDef options[] = {
     { "y",              OPT_BOOL,                                    {              &file_overwrite },
         "overwrite output files" },
     { "n",              OPT_BOOL,                                    {              &no_file_overwrite },
-        "do not overwrite output files" },
+        "never overwrite output files" },
     { "c",              HAS_ARG | OPT_STRING | OPT_SPEC |
                         OPT_INPUT | OPT_OUTPUT,                      { .off       = OFFSET(codec_names) },
         "codec name", "codec" },