X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=youtube_dl%2FPostProcessor.py;h=f2e2aa1fadf5e8c8c1962ef11851820802550ce0;hb=65f934dc930f7996e137d61dd80ef092f9075532;hp=375da1aa3f08cf0fb9d9886ee1b6d4308d18c763;hpb=b7b4796bf263295616aa1f7c8d3b8e4104601838;p=youtube-dl

diff --git a/youtube_dl/PostProcessor.py b/youtube_dl/PostProcessor.py
index 375da1aa3..f2e2aa1fa 100644
--- a/youtube_dl/PostProcessor.py
+++ b/youtube_dl/PostProcessor.py
@@ -71,13 +71,14 @@ class FFmpegExtractAudioPP(PostProcessor):
 
 	@staticmethod
 	def detect_executables():
-		available = {'avprobe' : False, 'avconv' : False, 'ffmpeg' : False, 'ffprobe' : False}
-		for path in os.environ["PATH"].split(os.pathsep):
-			for program in available.keys():
-				exe_file = os.path.join(path, program)
-				if os.path.isfile(exe_file) and os.access(exe_file, os.X_OK):
-					available[program] = exe_file
-		return available
+		def executable(exe):
+			try:
+				subprocess.check_output([exe, '-version'])
+			except OSError:
+				return False
+			return exe
+		programs = ['avprobe', 'avconv', 'ffmpeg', 'ffprobe']
+		return dict((program, executable(program)) for program in programs)
 
 	def get_audio_codec(self, path):
 		if not self._exes['ffprobe'] and not self._exes['avprobe']: return None