fix dict

bin/ffx.py

@@ -116,7 +116,7 @@ audioStreams = [s for s in streamData if s['codec_type'] == 'audio']
 subtitleStreams = [s for s in streamData if s['codec_type'] == 'subtitle']
 
 for aStream in audioStreams:
-    if 'channel_layout' in aStream.keys():
+    if 'channel_layout' in aStream:
         print(f"audio stream: {aStream['channel_layout']}") #channel_layout
     else:
         print(f"unknown audio stream with {aStream['channels']} channels") #channel_layout