[FFmpeg-cvslog] add note on windows pipe

[rogerdpack]

ffmpeg | branch: master | rogerdpack <rogerpack2005 at gmail.com> | Wed Dec 26 12:21:15 2012 -0700| [40648d8cc372c328965a2e2e8e5ef8c88cba3e3f] | committer: Michael Niedermayer

add note on windows pipe

Signed-off-by: rogerdpack <rogerpack2005 at gmail.com>
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=40648d8cc372c328965a2e2e8e5ef8c88cba3e3f
---

 ffmpeg.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/ffmpeg.c b/ffmpeg.c
index 977218f..acaa523 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -369,8 +369,10 @@ static int read_key(void)
     }
     if (is_pipe) {
         /* When running under a GUI, you will end here. */
-        if (!PeekNamedPipe(input_handle, NULL, 0, NULL, &nchars, NULL))
+        if (!PeekNamedPipe(input_handle, NULL, 0, NULL, &nchars, NULL)) {
+            // input pipe may have been closed by the program that ran ffmpeg
             return -1;
+        }
         //Read it
         if(nchars != 0) {
             read(0, &ch, 1);