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  • Can't save matplotlib animation (ffmpeg)

    25 mai 2014, par renger

    I am trying to get a simple animation saved using ffmpeg. I followed a tutorial to install ffmpeg, and I can now access it from the command prompt.

    Now I run this piece of code :

    import numpy as np
    from matplotlib import pyplot as plt
    from matplotlib import animation

    fig = plt.figure()
    ax = plt.axes(xlim=(0, 2), ylim=(-2, 2))
    line, = ax.plot([], [], lw=2)

    def init():
       line.set_data([], [])
       return line,

    def animate(i):
       x = np.linspace(0, 2, 1000)
       y = np.sin(2 * np.pi * (x - 0.01 * i))
       line.set_data(x, y)
       return line,

    anim = animation.FuncAnimation(fig, animate, init_func=init,
                                  frames=200, interval=20, blit=True)

    mywriter = animation.FFMpegWriter()
    anim.save('mymovie.mp4',writer=mywriter)

    plt.show()

    I get this error :

    Traceback (most recent call last):
     File "<stdin>", line 1, in <module>
      File "C:\Python27\lib\site-packages\spyderlib\widgets\externalshell\sitecustomize.py", line 523, in runfile
       execfile(filename, namespace)
     File "C:\Users\Renger\.xy\startups\b.py", line 23, in <module>
       anim.save('mymovie.mp4',writer=mywriter)
     File "C:\Python27\lib\site-packages\matplotlib\animation.py", line 609, in save
       with writer.saving(self._fig, filename, dpi):
     File "C:\Python27\lib\contextlib.py", line 17, in __enter__
       return self.gen.next()
     File "C:\Python27\lib\site-packages\matplotlib\animation.py", line 166, in saving
       self.setup(*args)
     File "C:\Python27\lib\site-packages\matplotlib\animation.py", line 156, in setup
       self._run()
     File "C:\Python27\lib\site-packages\matplotlib\animation.py", line 183, in _run
       stdin=subprocess.PIPE)
     File "C:\Python27\lib\subprocess.py", line 711, in __init__
       errread, errwrite)
     File "C:\Python27\lib\subprocess.py", line 948, in _execute_child
       startupinfo)
    WindowsError: [Error 2] Het systeem kan het opgegeven bestand niet vinden
    </module></module></stdin>

    The last dutch sentence does mean something like : The system can’t find the specified file.

    What do these errors mean, and how can I solve them ?

    Best,

  • Can't save matplotlib animation

    19 novembre 2014, par renger

    I am trying to get a simple animation saved using ffmpeg. I followed a tutorial to install ffmpeg, and I can now access it from the command prompt.

    Now I run this piece of code :

    import numpy as np
    from matplotlib import pyplot as plt
    from matplotlib import animation

    fig = plt.figure()
    ax = plt.axes(xlim=(0, 2), ylim=(-2, 2))
    line, = ax.plot([], [], lw=2)

    def init():
       line.set_data([], [])
       return line,

    def animate(i):
       x = np.linspace(0, 2, 1000)
       y = np.sin(2 * np.pi * (x - 0.01 * i))
       line.set_data(x, y)
       return line,

    anim = animation.FuncAnimation(fig, animate, init_func=init,
                                  frames=200, interval=20, blit=True)

    mywriter = animation.FFMpegWriter()
    anim.save('mymovie.mp4',writer=mywriter)

    plt.show()

    I get this error :

    Traceback (most recent call last):
     File "<stdin>", line 1, in <module>
      File "C:\Python27\lib\site-packages\spyderlib\widgets\externalshell\sitecustomize.py", line 523, in runfile
       execfile(filename, namespace)
     File "C:\Users\Renger\.xy\startups\b.py", line 23, in <module>
       anim.save('mymovie.mp4',writer=mywriter)
     File "C:\Python27\lib\site-packages\matplotlib\animation.py", line 609, in save
       with writer.saving(self._fig, filename, dpi):
     File "C:\Python27\lib\contextlib.py", line 17, in __enter__
       return self.gen.next()
     File "C:\Python27\lib\site-packages\matplotlib\animation.py", line 166, in saving
       self.setup(*args)
     File "C:\Python27\lib\site-packages\matplotlib\animation.py", line 156, in setup
       self._run()
     File "C:\Python27\lib\site-packages\matplotlib\animation.py", line 183, in _run
       stdin=subprocess.PIPE)
     File "C:\Python27\lib\subprocess.py", line 711, in __init__
       errread, errwrite)
     File "C:\Python27\lib\subprocess.py", line 948, in _execute_child
       startupinfo)
    WindowsError: [Error 2] Het systeem kan het opgegeven bestand niet vinden
    </module></module></stdin>

    The last dutch sentence does mean something like : The system can’t find the specified file.

    What do these errors mean, and how can I solve them ?

  • Change ffmeg output to mp4 format

    10 juin 2014, par user1580508

    Hello I would like to change the following below so that the output would be mp4 or a format that will also work on mobile devices. What do I need to change ?

           $sFfmpegPath = "/usr/local/bin/ffmpeg";

           $image  = $uploaded_path.$timeStamp.".jpg";
           if($imgSize!=''){
               $mainimage  = $uploaded_path.$timeStamp."_".$imgSize.".jpg";
           }
           $thumbnail=$timeStamp.".jpg";
           //$videoSize = '640x480';
           if($fileExt[count($fileExt)-1]!='flv'){
               //$command = $sFfmpegPath." -i ".$sFilesPath." -ar 22050 -ab 32 -f flv -s ". $VideoSize ." ".$destFile;
               $command = $sFfmpegPath." -i ".$sFilesPath." -s 640x480 -ar 44100 -async 44100 -r 59.970 -ac 2 -qscale 5 ".$destFile;
               exec($command);
           }else{
               copy($sFilesPath, $destFile);
           }
           $iSecond = 1000;
           $sInput = " -y -i ";
           //$ThumbSize = '200x150';
           //$sCommand = $sFfmpegPath.$sInput.$sFilesPath . " -ss " . $iSecond . " -vframes 1 -an -sameq -f image2 -s " . $ThumbSize . " " . $image;
           //$sCommand = $sFfmpegPath.$sInput.$sFilesPath . "  -y -f image2 -ss 4 -t 0.001 " . $image;
           //$sCommand = $sFfmpegPath.$sInput.$sFilesPath . "  -y -f image2 -ss 8 -sameq -t 0.001 -s 320*240 " . $image;

           //$sCommand =  $sFfmpegPath.$sInput.$sFilesPath." -vf thumbnail,scale=300:200 -frames:v 1". $image;
           $sCommand = $sFfmpegPath." -itsoffset -4  -i ".$sFilesPath." -vcodec mjpeg -vframes 1 -an -f rawvideo -s 640x480 ".$image;
           //-y -f image2 -ss 8 -sameq -t 0.001 -s 320*240
           $convert = exec($sCommand);
           if($imgSize!=''){
               //$sCommand1 = $sFfmpegPath.$sInput.$sFilesPath . " -ss " . $iSecond . " -vframes 1 -an -sameq -f image2 -s " . $imgSize . " " . $mainimage;

               //$sCommand1 = $sFfmpegPath.$sInput.$sFilesPath . "  -y -f image2 -ss 8 -sameq -t 0.001 -s 320*240 " . $image;

               //$sCommand1 = $sFfmpegPath.$sInput.$sFilesPath . "  -y -f image2 -ss 4 -t 0.001 " . $image;
               //$convert1 = exec($sCommand1);
           }
           //unlink($file_dest);

           return $timeStamp;