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  • Use, discuss, criticize

    13 avril 2011, par

    Talk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
    The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
    A discussion list is available for all exchanges between users.

  • 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 (...)

Sur d’autres sites (9260)

  • FFmpeg "movflags" > "faststart" causes invalid MP4 file to be written

    22 août 2016, par williamtroup

    I’m setting up the format layout for the video as follows :

    AVOutputFormat* outputFormat = ffmpeg.av_guess_format(null, "output.mp4", null);
    

    
AVCodec* videoCodec = ffmpeg.avcodec_find_encoder(outputFormat->video_codec);
    

    
AVFormatContext* formatContext = ffmpeg.avformat_alloc_context();
    
formatContext->oformat = outputFormat;
    
formatContext->video_codec_id = videoCodec->id;
    

    
ffmpeg.avformat_new_stream(formatContext, videoCodec);

    This is how I am setting up the Codec Context :

    AVCodecContext* codecContext = ffmpeg.avcodec_alloc_context3(videoCodec);
    
codecContext->bit_rate = 400000;
    
codecContext->width = 1280;
    
codecContext->height = 720;
    
codecContext->gop_size = 12;
    
codecContext->max_b_frames = 1;
    
codecContext->pix_fmt = videoCodec->pix_fmts[0];
    
codecContext->codec_id = videoCodec->id;
    
codecContext->codec_type = videoCodec->type;
    
codecContext->time_base = new AVRational
    
{
    
    num = 1,
    
    den = 30
    
};

    I’m using the following code to setup the "movflags" > "faststart" option for the header of the video :

    AVDictionary* options = null;
    

    
int result = ffmpeg.av_dict_set(&options, "movflags", "faststart", 0);
    

    
int writeHeaderResult = ffmpeg.avformat_write_header(formatContext, &options);

    The file is opened and the header is written as follows :

    if ((formatContext->oformat->flags & ffmpeg.AVFMT_NOFILE) == 0)
    
{
    
    int ioOptionResult = ffmpeg.avio_open(&formatContext->pb, "output.mp4", ffmpeg.AVIO_FLAG_WRITE);
    
}
    

    
int writeHeaderResult = ffmpeg.avformat_write_header(formatContext, &options);

    After this, I write each video frame as follows :

    outputFrame->pts = frameIndex;
    

    
packet.flags |= ffmpeg.AV_PKT_FLAG_KEY;
    
packet.pts = frameIndex;
    
packet.dts = frameIndex;
    

    
int encodedFrame = 0;
    
int encodeVideoResult = ffmpeg.avcodec_encode_video2(codecContext, &packet, outputFrame, &encodedFrame);
    

    
if (encodedFrame != 0)
    
{
    
    packet.pts = ffmpeg.av_rescale_q(packet.pts, codecContext->time_base, m_videoStream->time_base);
    
    packet.dts = ffmpeg.av_rescale_q(packet.dts, codecContext->time_base, m_videoStream->time_base);
    
    packet.stream_index = m_videoStream->index;
    

    
    if (codecContext->coded_frame->key_frame > 0)
    
    {
    
        packet.flags |= ffmpeg.AV_PKT_FLAG_KEY;
    
    }
    

    
    int writeFrameResult = ffmpeg.av_interleaved_write_frame(formatContext, &packet);
    
}

    After that, I write the trailer :

    int writeTrailerResult = ffmpeg.av_write_trailer(formatContext);

    The file finishes writing and everything closes and frees up correctly. However, the MP4 file is unplayable (even VLC cant play it). AtomicParsley.exe won’t show any information about the file either.

    The DLLs used for the AutoGen library are :

    avcodec-56.dll
    
avdevice-56.dll
    
avfilter-5.dll
    
avformat-56.dll
    
avutil-54.dll
    
postproc-53.dll
    
swresample-1.dll
    
swscale-3.dll

  • avfilter/idet : add metadata to "current" frame instead of "next" frame

    1er novembre 2014, par Kevin Mitchell
    avfilter/idet : add metadata to "current" frame instead of "next" frame

    Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
    • [DH] libavfilter/version.h
    • [DH] libavfilter/vf_idet.c

  • Add "prefer_tcp" flag to "rtsp_flags"

    4 mars 2014, par Andrey Utkin
    Add "prefer_tcp" flag to "rtsp_flags"

    If set, and if TCP is available as RTSP RTP transport, then TCP will be
    
tried first as RTP transport.
    

    Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
    • [DH] doc/protocols.texi
    • [DH] libavformat/rtsp.c
    • [DH] libavformat/rtsp.h

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