Show help if no cmd line options are provided at all.

This safes the users time to find out which of -h --help -? works.

Originally committed as revision 20822 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 3 insertions, 0 deletions

diff --git a/ffmpeg.c b/ffmpeg.c
index a1abd30cfe..2974edd177 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -3985,6 +3985,9 @@ int main(int argc, char **argv)
     /* parse options */
     parse_options(argc, argv, options, opt_output_file);
 
+    if(nb_output_files <= 0 && nb_input_files == 0)
+        show_help();
+
     /* file converter / grab */
     if (nb_output_files <= 0) {
         fprintf(stderr, "At least one output file must be specified\n");