Merge pull request matplotlib#504 from jdh2358/animation_verbose

Add a bit of logging to the animation module

Author: jkseppan

examples/animation/double_pendulum_animated.py

@@ -84,5 +84,5 @@ def animate(i):
 ani = animation.FuncAnimation(fig, animate, np.arange(1, len(y)),
     interval=25, blit=True, init_func=init)
 
-#ani.save('double_pendulum.mp4', fps=15, clear_temp=False)
+#ani.save('double_pendulum.mp4', fps=15, clear_temp=True)
 plt.show()

lib/matplotlib/animation.py

@@ -21,6 +21,7 @@
 # * Need to consider event sources to allow clicking through multiple figures
 import itertools
 from matplotlib.cbook import iterable
+from matplotlib import verbose
 
 class Animation(object):
     '''
@@ -120,13 +121,15 @@ def save(self, filename, fps=5, codec='mpeg4', clear_temp=True,
             self._draw_next_frame(data, blit=False)
             fname = '%s%04d.png' % (frame_prefix, idx)
             fnames.append(fname)
+            verbose.report('Animation.save: saved frame %d to fname=%s'%(idx, fname), level='debug')
             self._fig.savefig(fname)
 
         self._make_movie(filename, fps, codec, frame_prefix)
 
         #Delete temporary files
         if clear_temp:
             import os
+            verbose.report('Animation.save: clearing temporary fnames=%s'%str(fnames), level='debug')
             for fname in fnames:
                 os.remove(fname)
 
@@ -155,7 +158,9 @@ def _make_movie(self, fname, fps, codec, frame_prefix, cmd_gen=None):
         from subprocess import Popen, PIPE
         if cmd_gen is None:
             cmd_gen = self.ffmpeg_cmd
-        proc = Popen(cmd_gen(fname, fps, codec, frame_prefix), shell=False,
+        command = cmd_gen(fname, fps, codec, frame_prefix)
+        verbose.report('Animation._make_movie running command: %s'%' '.join(command))
+        proc = Popen(command, shell=False,
             stdout=PIPE, stderr=PIPE)
         proc.wait()