Recherche avancée

Médias (3)

Mot : - Tags -/collection

Autres articles (92)

  • Selection of projects using MediaSPIP

    2 mai 2011, par

    The examples below are representative elements of MediaSPIP specific uses for specific projects.
    MediaSPIP farm @ Infini
    The non profit organizationInfini develops hospitality activities, internet access point, training, realizing innovative projects in the field of information and communication technologies and Communication, and hosting of websites. It plays a unique and prominent role in the Brest (France) area, at the national level, among the half-dozen such association. Its members (...)

  • L’espace de configuration de MediaSPIP

    29 novembre 2010, par

    L’espace de configuration de MediaSPIP est réservé aux administrateurs. Un lien de menu "administrer" est généralement affiché en haut de la page [1].
    Il permet de configurer finement votre site.
    La navigation de cet espace de configuration est divisé en trois parties : la configuration générale du site qui permet notamment de modifier : les informations principales concernant le site (...)

  • Changer le statut par défaut des nouveaux inscrits

    26 décembre 2015, par

    Par défaut, lors de leur inscription, les nouveaux utilisateurs ont le statut de visiteur. Ils disposent de certains droits mais ne peuvent pas forcément publier leurs contenus eux-même etc...
    Il est possible de changer ce statut par défaut. en "rédacteur".
    Pour ce faire, un administrateur webmestre du site doit aller dans l’espace privé de SPIP en ajoutant ecrire/ à l’url de son site.
    Une fois dans l’espace privé, il lui faut suivre les menus configuration > Interactivité et activer (...)

Sur d’autres sites (13173)

  • Black overlay appears when merging a transparent video to another video

    13 juin 2012, par RakeshS

    This is what I have done so far :

    Command to create a transparent PNG image :

    convert -size 640x480 -background transparent -fill blue \
    
-gravity South label:ROCK image1-0.png

    Command to create a transparent video :

    ffmpeg -loop 1 -f image2 -i image1-0.png -r 20 -vframes 100 \
    
-vcodec png -pix_fmt bgra mov-1.mov

    (as per this post) - I expect this video to be a transparent video.

    Command to overlay a video with another :

    ffmpeg -i final-video.mov -sameq -ar 44100 \
    
-vf "movie=mov-1.mov [logo];[in][logo] overlay=0:0 [out]" \
    
-strict experimental final-video.mov

    Above commands works perfect and I have not faced any problem, but I don't get what I expect which is kinda watermarking effect, I want mov-1.mov to be transparent with final-video.mov.

    Questions :

    1. Is there any way to verify if the generated video is transparent ? other than merging ?
    2. Not sure why the above mov-1.mov is not transparent when it is merged with final-video.mov, any info to solve this problem would be great.

    Please help.

  • Does the incoming codec or audio-video sync matter when encoding from Xvfb using FFMPEG ?

    15 décembre 2022, par Nav

    How I'm capturing :
    
I'm using Xvfb on Linux, to capture a video and audio from an app that is also running on Linux. I'm using -f x11grab when capturing that video headlessly from Xvfb's frambuffer using FFMPEG, and encoding it using a few other parameters like -c:v libx264 -pix_fmt yuv420p.

    


    The questions :
    
Since I'm reading from Xvfb framebuffer :

    


      

    1. Would it matter that the app uses SVC to encode the video, and I'm using H.264 ?

      2. 


    2. Would it matter if I use a different framerate than the app is using ?

      3. 


    3. Would it matter if I use a different pix_fmt than what the app is using ?

      4. 


    


    Reason for asking :

    


    enter image description here
    
As shown in the image (blue is the app, red is FFMPEG, green is Xvfb) ;

    


      

    • The CPU percentage consumed by FFMPEG shoots up when the app's CPU percentage shoots up. I've also encountered audio being ahead of video for some participants, but I'm unable to figure out whether it's due to network lag or due to FFMPEG's encoding.

      • 


    • Also, the aim is to reduce CPU consumption, so I was looking to see if I could do FFMPEG encoding in the same format as the app.

      • 


    


  • FFmpeg and Jupyter Notebooks

    12 mai 2022, par Clerni

    I'm getting the error RuntimeError: Requested MovieWriter (ffmpeg) not available when trying to run this simple example of creating and displaying an animation in a Jupyter Notebook.

    


    ---------------------------------------------------------------------------&#xA;RuntimeError                              Traceback (most recent call last)&#xA; in <module>&#xA;      8 &#xA;      9 # Define the meta data for the movie&#xA;---> 10 FFMpegWriter = manimation.writers[&#x27;ffmpeg&#x27;]&#xA;     11 metadata = dict(title=&#x27;Movie Test&#x27;, artist=&#x27;Matplotlib&#x27;,&#xA;     12                 comment=&#x27;a red circle following a blue sine wave&#x27;)&#xA;&#xA;/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py in __getitem__(self, name)&#xA;    164         if self.is_available(name):&#xA;    165             return self._registered[name]&#xA;--> 166         raise RuntimeError(f"Requested MovieWriter ({name}) not available")&#xA;    167 &#xA;    168 &#xA;&#xA;RuntimeError: Requested MovieWriter (ffmpeg) not available&#xA;&#xA;</module>

    &#xA;

    Running !pip install ffmpeg didn't help, as ffmpeg is already installed, apparently :

    &#xA;

    Requirement already satisfied: ffmpeg in /home/username/.local/lib/python3.8/site-packages&#xA;

    &#xA;

    How can I make this work ?

    &#xA;

Navigation