add check for ffmpeg. attempt to install in linux

Transcoder.py

@@ -7,6 +7,23 @@ from subprocess import call
 Logger = logging.getLogger()
 
 def Transcode_file(filePath):
+    
+    if os.name == 'nt':
+        ffmpeg = os.path.join(os.path.dirname(sys.argv[0]), 'ffmpeg\bin\ffmpeg.exe') # note, will need to package in this dir.
+        if not os.path.isfile(ffmpeg): # problem
+            Logger.error("ffmpeg not found. ffmpeg needs to be located at: %s", ffmpeg) 
+            Logger.info("Cannot transcode file %s", filepath)
+            return 1 # failure
+    else
+        if call(['which', ffmpeg]):
+            res = call([os.path,join(os.path.dirname(sys.argv[0]),getffmpeg.sh')])
+            if res or call(['which', ffmpeg]): # did not install or ffmpeg still not found.
+                Logger.error("Failed to install ffmpeg. Please install manually") 
+                Logger.info("Cannot transcode file %s", filepath)
+                return 1 # failure
+            else:
+                ffmpeg = 'ffmpeg'
+    
     config = ConfigParser.ConfigParser()
     configFilename = os.path.join(os.path.dirname(sys.argv[0]), "autoProcessMedia.cfg")
     Logger.info("Loading config from %s", configFilename)
@@ -18,7 +35,6 @@ def Transcode_file(filePath):
     config.read(configFilename)
     
     duplicate = config.get("Transcoder", "duplicate")
-    ffmpeg = os.path.normpath(config.get("Transcoder", "ffmpeg"))
     ignoreExtensions = (config.get("Transcoder", "ignoreExtensions")).split(',')
     outputVideoExtension = config.get("Transcoder", "outputVideoExtension")
     outputVideoCodec = config.get("Transcoder", "outputVideoCodec")