Use '--' to separate the file argument from the options when calling ffmpeg

This is to avoid a potential issue if the file name begins with a hyphen since ffmpeg will interpret it as an option

diff --git a/youtube-dl b/youtube-dl
index 072a919..79185b1 100755 (executable)
--- a/youtube-dl
+++ b/youtube-dl
@@ -2620,7 +2620,7 @@ class FFmpegExtractAudioPP(PostProcessor):
        @staticmethod
        def get_audio_codec(path):
                try:
-                       handle = subprocess.Popen(['ffprobe', '-show_streams', path],
+                       handle = subprocess.Popen(['ffprobe', '-show_streams', '--', path],
                                        stderr=file(os.path.devnull, 'w'), stdout=subprocess.PIPE)
                        output = handle.communicate()[0]
                        if handle.wait() != 0:
@@ -2638,7 +2638,7 @@ class FFmpegExtractAudioPP(PostProcessor):
        @staticmethod
        def run_ffmpeg(path, out_path, codec, more_opts):
                try:
-                       ret = subprocess.call(['ffmpeg', '-y', '-i', path, '-vn', '-acodec', codec] + more_opts + [out_path],
+                       ret = subprocess.call(['ffmpeg', '-y', '-i', path, '-vn', '-acodec', codec] + more_opts + ['--', out_path],
                                        stdout=file(os.path.devnull, 'w'), stderr=subprocess.STDOUT)
                        return (ret == 0)
                except (IOError, OSError):