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Sur d’autres sites (7855)

  • 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

  • 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

  • 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(&amp;options, "movflags", "faststart", 0);
    

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

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

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

    
int writeHeaderResult = ffmpeg.avformat_write_header(formatContext, &amp;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, &amp;packet, outputFrame, &amp;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, &amp;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

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