matplotlib-users Mailing List for matplotlib

Hello all.  I use matplotlib occasionally but not often enough that I
remember the api, so when I use it, I refer frequently to the docs.  I
appreciate that the docs are very complete in most areas, but I find
navigation very difficult.  I have chm files for most of the platforms I
use and I appreciate the navigation pane they provide.

To make a long story short, I have created a small extension for Google
Chrome which pulls out the relevant information and creates a handy-dandy
treeview navigation pane for the matplotlib api docs.  I threw in support
for the python docs as well.

Learn more and install the extension here:
https://bitbucket.org/altaurog/sphdoctoc

enjoy,
Aryeh Leib Taurog

yeap, thanks a lot.

after installing ffmpeg everything is working smoothly.



On 29.12.2011 12:12, Fabrice Silva wrote:
> It seems that the Animation.save method assume that ffmpeg is installed,
> as there is no cmd_gen keyword argument for this method.
>
> As a quick and dirty fix, you may change the imposed commandline
> constructor overloading the ffmpeg_cmd method
>
>          ani.ffmpeg_cmd = ani.mencoder_cmd
>
> or, if you prefer using gstreamer, something like that (not tested)
>          def gst_cmd(fname, fps, codec, frame_prefix):
>              cmd = 'gst-launch multifilesrc location="{prefix}%%04d.png" index={i0} num-buffers={nb} '\
>          	  'caps="image/png,framerate=\(fraction\){fps}/1" ! pngdec ! ffmpegcolorspace ! '\
>          	  '{codec_f} ! filesink location={fname} '
>             nb_frames = len([tmp for tmp in os.listdir('./') if tmp.endswith('.png') and tmp.startswith(frame_prefix)])
>             return cmd.format(prefix=frame_prefix, i0=0, nb=nb_frames, fps=fps, codec_f=codec+'mux', fname=fname)
>
>          ani.ffmpeg_cmd = gst_cmd

Maybe this is worth reviewing and refining: seems like all the parts are there, as I suspected. 

http://telliott99.blogspot.com/2011/07/matplotlib-on-os-x-lion-revised.html 


> BTW, whatever you do, do not follow the instructions that the matplotlib developers provide. You do not need another Python, including MacPython or the Endthought distribution or anything else..
--
Paul Beard

Are you trying to win an argument or solve a problem? 

This is turning out to be complicated. Is there any easier way? 

It may be something as simple as a damaged archive, as this doesn't look right: 

[/home/paul/src/basemap-1.0.2]:: find . -name setup.py
(pa...@sh...)-(07:02 AM / Thu Dec 29)

It makes this step difficult: 
3) cd back to the top level basemap directory (basemap-X.Y.Z) and
run the usual 'python setup.py install'.  Check your installation
by running "from mpl_toolkits.basemap import Basemap" at the python
prompt.

I have tried easy-install (it wasn't). I have tried pulling from git:
python setup.py build
Traceback (most recent call last):
  File "setup.py", line 42, in <module>
    from setupext import build_agg, build_gtkagg, build_tkagg,\
  File "/usr/home/paul/src/matplotlib/setupext.py", line 184, in <module>
    basedirlist = basedir[sys.platform]
KeyError: 'freebsd8'

I tried the packaged version on OS X Lion: 



Built for OS X 10.3? Really? 

I'm not installing fink or macports or homebrew: if it doesn't install from source without a duplicated file hierarchy I'm not interested.

Any hope here? 

--
Paul Beard

Are you trying to win an argument or solve a problem? 

It seems that the Animation.save method assume that ffmpeg is installed,
as there is no cmd_gen keyword argument for this method.

As a quick and dirty fix, you may change the imposed commandline
constructor overloading the ffmpeg_cmd method

        ani.ffmpeg_cmd = ani.mencoder_cmd

or, if you prefer using gstreamer, something like that (not tested)
        def gst_cmd(fname, fps, codec, frame_prefix):
            cmd = 'gst-launch multifilesrc location="{prefix}%%04d.png" index={i0} num-buffers={nb} '\
        	  'caps="image/png,framerate=\(fraction\){fps}/1" ! pngdec ! ffmpegcolorspace ! '\
        	  '{codec_f} ! filesink location={fname} '
           nb_frames = len([tmp for tmp in os.listdir('./') if tmp.endswith('.png') and tmp.startswith(frame_prefix)])
           return cmd.format(prefix=frame_prefix, i0=0, nb=nb_frames, fps=fps, codec_f=codec+'mux', fname=fname)
        
        ani.ffmpeg_cmd = gst_cmd
-- 
Fabrice Silva

Hi,

running the "AnimatedImage.py" I get the appended error message.

What's wrong?

Cheers
Elmar



In [5]: run AnimatedImage.py
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (23, 0))
---------------------------------------------------------------------------
OSError                                   Traceback (most recent call last)
/usr/local/lib/python2.7/dist-packages/IPython/utils/py3compat.pyc in 
execfile(fname, *where)
     173             else:
     174                 filename = fname
--> 175             __builtin__.execfile(filename, *where)

/home/elmar/PyScripts/examples_mpl/AnimatedImage.py in <module>()
      27     repeat_delay=1000)
      28
---> 29 ani.save('dynamic_images.mp4')
      30
      31

/usr/local/lib/python2.7/dist-packages/matplotlib/animation.pyc in 
save(self, filename, fps, codec, clear_temp, frame_prefix)
     125             self._fig.savefig(fname)
     126
--> 127         self._make_movie(filename, fps, codec, frame_prefix)
     128
     129         #Delete temporary files


/usr/local/lib/python2.7/dist-packages/matplotlib/animation.pyc in 
_make_movie(self, fname, fps, codec, frame_prefix, cmd_gen)
     162         verbose.report('Animation._make_movie running command: 
%s'%' '.join(command))
     163         proc = Popen(command, shell=False,
--> 164             stdout=PIPE, stderr=PIPE)
     165         proc.wait()
     166

/usr/lib/python2.7/subprocess.pyc in __init__(self, args, bufsize, 
executable, stdin, stdout, stderr, preexec_fn, close_fds, shell, cwd, 
env, universal_newlines, startupinfo, creationflags)
     677                             p2cread, p2cwrite,
     678                             c2pread, c2pwrite,
--> 679                             errread, errwrite)
     680
     681         if mswindows:

/usr/lib/python2.7/subprocess.pyc in _execute_child(self, args, 
executable, preexec_fn, close_fds, cwd, env, universal_newlines, 
startupinfo, creationflags, shell, p2cread, p2cwrite, c2pread, c2pwrite, 
errread, errwrite)
    1237                     if fd is not None:
    1238                         os.close(fd)
-> 1239                 raise child_exception
    1240
    1241