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  • Gestion des droits de création et d’édition des objets

    8 février 2011, par

    Par défaut, beaucoup de fonctionnalités sont limitées aux administrateurs mais restent configurables indépendamment pour modifier leur statut minimal d’utilisation notamment : la rédaction de contenus sur le site modifiables dans la gestion des templates de formulaires ; l’ajout de notes aux articles ; l’ajout de légendes et d’annotations sur les images ;

  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

  • Les formats acceptés

    28 janvier 2010, par

    Les commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
    ffmpeg -codecs ffmpeg -formats
    Les format videos acceptés en entrée
    Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
    Les formats vidéos de sortie possibles
    Dans un premier temps on (...)

Sur d’autres sites (8920)

  • What do I need in order to save animation videos from matplotlib in mp3 format ?

    27 juin 2022, par DarthMalloc

    I am using python3.8 on Linux Mint 19.3, and I am trying to save an animation created by a cellular automata model in matplotlib. My actual code for the model is private, but it uses the same code for saving the animation as the code shown below, which is a slight modification of one of the examples shown in the official matplotlib documentation :

    


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

fig, ax = plt.subplots()


def f(x, y):
    return np.sin(x) + np.cos(y)

x = np.linspace(0, 2 * np.pi, 120)
y = np.linspace(0, 2 * np.pi, 100).reshape(-1, 1)

fig, ax = plt.subplots()


    
ims = []
for i in range(60):
    x += np.pi / 15.
    y += np.pi / 20.
    im = ax.imshow(f(x, y), animated=True)
    if i == 0:
        ax.imshow(f(x, y))  # show an initial one first
    ims.append([im])

ani = animation.ArtistAnimation(fig, ims, interval=50, blit=True,
                                    repeat_delay=1000)

    # To save the animation, use e.g.
    #
    # ani.save("movie.mp4")
    #
    # or
    #
writer = animation.FFMpegWriter(fps=15, metadata=dict(artist='Me'), bitrate=1800)
ani.save("movie.mp3", writer=writer)


    


    When executed, the code produces this error :

    


        MovieWriter stderr:&#xA;    Output file #0 does not contain any stream&#xA;&#xA;    Traceback (most recent call last):&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 234, in saving&#xA;        yield self&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 1093, in save&#xA;        writer.grab_frame(**savefig_kwargs)&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 351, in grab_frame&#xA;        self.fig.savefig(self._proc.stdin, format=self.frame_format,&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/figure.py", line 3046, in savefig&#xA;        self.canvas.print_figure(fname, **kwargs)&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/backend_bases.py", line 2319, in print_figure&#xA;        result = print_method(&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/backend_bases.py", line 1648, in wrapper&#xA;        return func(*args, **kwargs)&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/_api/deprecation.py", line 415, in wrapper&#xA;        return func(*inner_args, **inner_kwargs)&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/backends/backend_agg.py", line 486, in print_raw&#xA;        fh.write(renderer.buffer_rgba())&#xA;    BrokenPipeError: [Errno 32] Broken pipe&#xA;&#xA;    During handling of the above exception, another exception occurred:&#xA;&#xA;    Traceback (most recent call last):&#xA;      File "/home/justin/animation_test.py", line 36, in <module>&#xA;        ani.save("movie.mp3", writer=writer)&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 1093, in save&#xA;        writer.grab_frame(**savefig_kwargs)&#xA;      File "/usr/lib/python3.8/contextlib.py", line 131, in __exit__&#xA;        self.gen.throw(type, value, traceback)&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 236, in saving&#xA;        self.finish()&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 342, in finish&#xA;        self._cleanup()  # Inline _cleanup() once cleanup() is removed.&#xA;      File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 373, in _cleanup&#xA;        raise subprocess.CalledProcessError(&#xA;    subprocess.CalledProcessError: Command &#x27;[&#x27;ffmpeg&#x27;, &#x27;-f&#x27;, &#x27;rawvideo&#x27;, &#x27;-vcodec&#x27;, &#x27;rawvideo&#x27;, &#x27;-s&#x27;, &#x27;640x480&#x27;, &#x27;-pix_fmt&#x27;, &#x27;rgba&#x27;, &#x27;-r&#x27;, &#x27;15&#x27;, &#x27;-loglevel&#x27;, &#x27;error&#x27;, &#x27;-i&#x27;, &#x27;pipe:&#x27;, &#x27;-vcodec&#x27;, &#x27;h264&#x27;, &#x27;-pix_fmt&#x27;, &#x27;yuv420p&#x27;, &#x27;-b&#x27;, &#x27;1800k&#x27;, &#x27;-metadata&#x27;, &#x27;artist=Me&#x27;, &#x27;-y&#x27;, &#x27;movie.mp3&#x27;]&#x27; returned non-zero exit status 1.&#xA;</module>

    &#xA;

    I have looked at posts on similar queries concerning matplotlib animations, but none have specifically included the error Output file #0 does not contain any stream. I have little experience with ffmpeg, so I am wondering what might be missing.

    &#xA;

  • avcodec/speedhqenc : Hardcode table to save space

    10 décembre 2020, par Andreas Rheinhardt
    avcodec/speedhqenc : Hardcode table to save space

    The SpeedHQ encoder currently reverses the entries of two small tables
    
and stores them in other tables. These other tables have a size of 48
    
bytes, yet the code for their initialization takes 135 bytes (GCC 9.3,
    
x64, O3 albeit in an av_cold function). So remove the runtime
    
initialization and hardcode the tables.
    

    Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
    • [DH] libavcodec/speedhqenc.c

  • FFMPEG not save logs when converting to audio format

    27 mars 2017, par PUXIII

    The command does not save or even create a file :

    ffmpeg -i "video.mp4" -f mp3 "audio.mp3" -vstats_file "log_file.log"

    And if you convert to a video file, everything normally creates and writes :

    ffmpeg -i "video.mp4" -f mp3 "video.avi" -vstats_file "log_file.log"

    Goal : to pull out the time from the log file and bind it to the process bar.

    There are no problems with video, everything works. But with the sound does not work.

    I tried the command :

    ffmpeg -i "video.mp4" -f mp3 "video.avi" >2 "log_file.txt"
    But there are other problems popping out. Since I run it all from the python using the subprocess

    ffmpegProc = subprocess.Popen(ffmpegCommand, startupinfo=startupinfo, shell=True)
    , I can not kill the running process, because it is started with the attribute shell=True, and only the shell is killed.and only the shell is killed.

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