write stderr to /dev/null, subprocess might block with lots of errors otherwise

oxtimelines/ffmpeg.py

@@ -112,7 +112,7 @@ def video(path, height=96, info=None, framerate=FPS):
     p = subprocess.Popen(cmd,
         bufsize=bufsize,
         stdout=subprocess.PIPE,
-        stderr=subprocess.PIPE)
+        stderr=open('/dev/null', 'w'))
 
     first = True
     while True:
@@ -151,7 +151,7 @@ def audio(path, info=None, samplerate=48000, framerate=FPS):
     p = subprocess.Popen(cmd,
         bufsize=bufsize,
         stdout=subprocess.PIPE,
-        stderr=subprocess.PIPE)
+        stderr=open('/dev/null', 'w'))
 
     chunk = int(nbytes / framerate)
     first = True