diff --git a/cuburn/output.py b/cuburn/output.py
index 7701004..4862f11 100644
--- a/cuburn/output.py
+++ b/cuburn/output.py
@@ -1,5 +1,6 @@
 import io
 import os
+import sys
 import tempfile
 from cStringIO import StringIO
 from subprocess import Popen, PIPE
@@ -273,8 +274,8 @@ class X264Output(Output, ClsMod):
         try:
             subp.stdin.write(buffer(buf))
         except IOError, e:
-            print 'Exception while writing. Log:'
-            print subp.stderr.read()
+            print >> sys.stderr, 'Exception while writing. Log:'
+            print >> sys.stderr, subp.stderr.read()
             raise e
 
     def encode(self, buf):
@@ -388,8 +389,8 @@ class VPxOutput(Output, ClsMod):
         try:
             subp.stdin.write(buffer(buf))
         except IOError, e:
-            print 'Exception while writing. Log:'
-            print subp.stderr.read()
+            print >> sys.stderr, 'Exception while writing. Log:'
+            print >> sys.stderr, subp.stderr.read()
             raise e
 
     def encode(self, buf):
diff --git a/cuburn/render.py b/cuburn/render.py
index b3cf59a..e8747b7 100644
--- a/cuburn/render.py
+++ b/cuburn/render.py
@@ -352,7 +352,7 @@ class RenderManager(ClsMod):
             # Do a blocking sync to free up resources. This may slightly reduce
             # parallelism but makes it a whole heck of a lot easier to keep
             # using the computer while things render.
-            print 'Launches became blocking, synchronizing'
+            print >> sys.stderr, 'Launches became blocking, synchronizing'
             iter_stream_right.synchronize()
 
           # Make sure the other stream is done flushing before we start
diff --git a/main.py b/main.py
index e4f3e4a..c8029bd 100755
--- a/main.py
+++ b/main.py
@@ -74,8 +74,8 @@ def main(args, prof):
                   if getattr(file_like, 'close', None):
                       file_like.close()
               for key, val in log:
-                  print '\n=== %s ===' % key
-                  print val
+                  print >> sys.stderr, '\n=== %s ===' % key
+                  print >> sys.stderr, val
 
           evt = buf = next_evt = next_buf = None
           for idx, t in enumerate(list(times) + [None]):
@@ -98,12 +98,12 @@ def main(args, prof):
                       os.rename(args.rawfn + '.tmp', args.rawfn)
                   except:
                       import traceback
-                      print 'Failed to write %s: %s' % (
+                      print >> sys.stderr, 'Failed to write %s: %s' % (
                           args.rawfn, traceback.format_exc())
-              print '%s%s (%3d/%3d), %dms' % (
+              print >> sys.stderr, '%s%s (%3d/%3d), %dms' % (
                   ('%d: ' % args.device) if args.device >= 0 else '',
                   name, idx, len(times), last_render_time_ms)
-              sys.stdout.flush()
+              sys.stderr.flush()
 
           save(None)