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  • (Dés)Activation de fonctionnalités (plugins)

    18 février 2011, par

    Pour gérer l’ajout et la suppression de fonctionnalités supplémentaires (ou plugins), MediaSPIP utilise à partir de la version 0.2 SVP.
    SVP permet l’activation facile de plugins depuis l’espace de configuration de MediaSPIP.
    Pour y accéder, il suffit de se rendre dans l’espace de configuration puis de se rendre sur la page "Gestion des plugins".
    MediaSPIP est fourni par défaut avec l’ensemble des plugins dits "compatibles", ils ont été testés et intégrés afin de fonctionner parfaitement avec chaque (...)

  • Le plugin : Podcasts.

    14 juillet 2010, par

    Le problème du podcasting est à nouveau un problème révélateur de la normalisation des transports de données sur Internet.
    Deux formats intéressants existent : Celui développé par Apple, très axé sur l’utilisation d’iTunes dont la SPEC est ici ; Le format "Media RSS Module" qui est plus "libre" notamment soutenu par Yahoo et le logiciel Miro ;
    Types de fichiers supportés dans les flux
    Le format d’Apple n’autorise que les formats suivants dans ses flux : .mp3 audio/mpeg .m4a audio/x-m4a .mp4 (...)

  • Other interesting software

    13 avril 2011, par

    We don’t claim to be the only ones doing what we do ... and especially not to assert claims to be the best either ... What we do, we just try to do it well and getting better ...
    The following list represents softwares that tend to be more or less as MediaSPIP or that MediaSPIP tries more or less to do the same, whatever ...
    We don’t know them, we didn’t try them, but you can take a peek.
    Videopress
    Website : http://videopress.com/
    License : GNU/GPL v2
    Source code : (...)

Sur d’autres sites (6677)

  • saving H.264 encoded images with libavcodec

    8 octobre 2011, par user846400

    I am getting H.264 images from an IP camera and want to save the encoded images (without decoding). I am using output-example.c from ffmpeg (libavformat/output-example.c) for this purpose. For Saving the raw H.264 image, I do the following :

    AVPacket pkt;
    
av_init_packet(&pkt);
    
if (c->coded_frame->pts != AV_NOPTS_VALUE)
    
        pkt.pts= av_rescale_q(c->coded_frame->pts, c->time_base, st->time_base);
    
if(c->coded_frame->key_frame)
    
        pkt.flags |= PKT_FLAG_KEY;
    
pkt.stream_index= st->index;
    
pkt.data= (uint8_t *)ulAddr;//video_outbuf;
    
pkt.size= out_size;
    
save_image(pkt.data, out_size);

    Where ulAddr is the address pointer to the image and out_size is the image size. Instead of saving the images to a media video file, I want to save the individual images. save_image function simply uses basic fopen and fwrite functions for saving the images. If I decode the frame and then save, everything works fine. But I have problem saving the encoded frames. The encoded frames are saved with a very small size and then they cannot be decoded.
    Is there anything wrong ? I will really appreciate any help in this regard.

  • Splitting odd and even frames in Gstreamer

    4 avril 2014, par user3498379

    I am building an application whereby I need to split a videostream(RTSP/MJPEG) into individual frames. The extracted frames then need to be put into two named pipes. I need to alternate the frames between two named pipes, i.e. even frames go to pipe one and odd frames go to pipe 2. I have been able to achieve this with ffmpeg using the following command :

    ffmpeg -i "rtsp://<ipaddress>/axis-media/media.amp?videocodec=jpeg" -vf select="mod(n-1\,2)" -vcodec mjpeg -f avi -y  -vf select="not(mod(n-1\,2))" -vcodec mjpeg -f avi -y 
    
</ipaddress>

    However I have run into an RTP packet size issue with ffmpeg when using large resolutions e.g. 2048x1536. My question is ; is there a gstreamer equivalent command ? I have the basic gstreamer command which extracts images :

     gst-launch rtspsrc location=rtsp://<ipaddress>/axis-media/media.amp?videocodec=jpeg ! decodebin2 ! jpegenc ! multifilesink location="frame%d.jpg"
    
</ipaddress>

    But now I need the additional piece, any help will be much appreciated.

  • How to fade video using a custom curve function in ffmpeg ?

    2 avril 2018, par Zoltan

    I would like to fade out a video using a different transition curve than what the fade filter uses (which is probably linear).

    For audio, I can easily choose from a wide variety of curves that the afade filter provides, or I can supply a custom expression to the volume filter, like (sin(PI/2 * min(1\, max(-1\, 1/2 * (t - 3)))) + 1)/2. For video, however, I could not find similar possibilities.

    Based on its description, it seems to me that the geq filter could be misused to achieve this, but I couldn’t get it to work. Additionally, it is very slow, probably because it works on individual pixels, even though the expression only depends on time.

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