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  • Submit bugs and patches

    13 avril 2011

    Unfortunately a software is never perfect.
    If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
    If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
    You may also (...)

  • Support audio et vidéo HTML5

    10 avril 2011

    MediaSPIP utilise les balises HTML5 video et audio pour la lecture de documents multimedia en profitant des dernières innovations du W3C supportées par les navigateurs modernes.
    Pour les navigateurs plus anciens, le lecteur flash Flowplayer est utilisé.
    Le lecteur HTML5 utilisé a été spécifiquement créé pour MediaSPIP : il est complètement modifiable graphiquement pour correspondre à un thème choisi.
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  • HTML5 audio and video support

    13 avril 2011, par

    MediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
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  • ffmpeg MKV to MP4 format conversion issues

    28 septembre 2019, par Lucas Lecce

    I converted a 3Gb MKV video file to MP4 format using the following ffmpeg command :

    ffmpeg -i input.mkv -c: v libx264 -crf 23 -c: a aac -movflags faststart output.mp4
    ffmpeg -i input.mkv -acodec copy -vcodec copy output.mp4
    
ffmpeg version N-95111-g87ddf9f1ef Copyright (c) 2000-2019 the FFmpeg developers
    
  built with gcc 9.2.1 (GCC) 20190918
    
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
    
  libavutil      56. 35.100 / 56. 35.100
    
  libavcodec     58. 59.100 / 58. 59.100
    
  libavformat    58. 33.100 / 58. 33.100
    
  libavdevice    58.  9.100 / 58.  9.100
    
  libavfilter     7. 59.100 /  7. 59.100
    
  libswscale      5.  6.100 /  5.  6.100
    
  libswresample   3.  6.100 /  3.  6.100
    
  libpostproc    55.  6.100 / 55.  6.100
    
Input #0, matroska,webm, from 'input.mkv':
    
  Metadata:
    
    title           : claucha75
    
    encoder         : libebml v1.3.5 + libmatroska v1.4.8
    
    creation_time   : 2018-01-23T22:07:33.000000Z
    
  Duration: 01:37:13.89, start: 0.000000, bitrate: 5044 kb/s
    
    Stream #0:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
    
    Metadata:
    
      title           : claucha75
    
      BPS             : 4146894
    
      BPS-eng         : 4146894
    
      DURATION        : 01:37:12.952000000
    
      DURATION-eng    : 01:37:12.952000000
    
      NUMBER_OF_FRAMES: 139851
    
      NUMBER_OF_FRAMES-eng: 139851
    
      NUMBER_OF_BYTES : 3023579528
    
      NUMBER_OF_BYTES-eng: 3023579528
    
      _STATISTICS_WRITING_APP: mkvmerge v20.0.0 ('I Am The Sun') 64-bit
    
      _STATISTICS_WRITING_APP-eng: mkvmerge v20.0.0 ('I Am The Sun') 64-bit
    
      _STATISTICS_WRITING_DATE_UTC: 2018-01-23 22:07:33
    
      _STATISTICS_WRITING_DATE_UTC-eng: 2018-01-23 22:07:33
    
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    
    Stream #0:1(spa): Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s (default)
    
    Metadata:
    
      title           : Latino
    
      BPS             : 448000
    
      BPS-eng         : 448000
    
      DURATION        : 01:37:13.888000000
    
      DURATION-eng    : 01:37:13.888000000
    
      NUMBER_OF_FRAMES: 182309
    
      NUMBER_OF_FRAMES-eng: 182309
    
      NUMBER_OF_BYTES : 326697728
    
      NUMBER_OF_BYTES-eng: 326697728
    
      _STATISTICS_WRITING_APP: mkvmerge v20.0.0 ('I Am The Sun') 64-bit
    
      _STATISTICS_WRITING_APP-eng: mkvmerge v20.0.0 ('I Am The Sun') 64-bit
    
      _STATISTICS_WRITING_DATE_UTC: 2018-01-23 22:07:33
    
      _STATISTICS_WRITING_DATE_UTC-eng: 2018-01-23 22:07:33
    
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    
    Stream #0:2(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
    
    Metadata:
    
      title           : Ingles
    
      BPS             : 448000
    
      BPS-eng         : 448000
    
      DURATION        : 01:37:13.856000000
    
      DURATION-eng    : 01:37:13.856000000
    
      NUMBER_OF_FRAMES: 182308
    
      NUMBER_OF_FRAMES-eng: 182308
    
      NUMBER_OF_BYTES : 326695936
    
      NUMBER_OF_BYTES-eng: 326695936
    
      _STATISTICS_WRITING_APP: mkvmerge v20.0.0 ('I Am The Sun') 64-bit
    
      _STATISTICS_WRITING_APP-eng: mkvmerge v20.0.0 ('I Am The Sun') 64-bit
    
      _STATISTICS_WRITING_DATE_UTC: 2018-01-23 22:07:33
    
      _STATISTICS_WRITING_DATE_UTC-eng: 2018-01-23 22:07:33
    
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    
    Stream #0:3(spa): Subtitle: subrip
    
    Metadata:
    
      title           : Sub. Latino
    
      BPS             : 58
    
      BPS-eng         : 58
    
      DURATION        : 01:27:56.723000000
    
      DURATION-eng    : 01:27:56.723000000
    
      NUMBER_OF_FRAMES: 1048
    
      NUMBER_OF_FRAMES-eng: 1048
    
      NUMBER_OF_BYTES : 38641
    
      NUMBER_OF_BYTES-eng: 38641
    
      _STATISTICS_WRITING_APP: mkvmerge v20.0.0 ('I Am The Sun') 64-bit
    
      _STATISTICS_WRITING_APP-eng: mkvmerge v20.0.0 ('I Am The Sun') 64-bit
    
      _STATISTICS_WRITING_DATE_UTC: 2018-01-23 22:07:33
    
      _STATISTICS_WRITING_DATE_UTC-eng: 2018-01-23 22:07:33
    
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    
    Stream #0:4(eng): Subtitle: subrip
    
    Metadata:
    
      title           : Sub. Ingles
    
      BPS             : 72
    
      BPS-eng         : 72
    
      DURATION        : 01:32:29.880000000
    
      DURATION-eng    : 01:32:29.880000000
    
      NUMBER_OF_FRAMES: 1820
    
      NUMBER_OF_FRAMES-eng: 1820
    
      NUMBER_OF_BYTES : 50243
    
      NUMBER_OF_BYTES-eng: 50243
    
      _STATISTICS_WRITING_APP: mkvmerge v20.0.0 ('I Am The Sun') 64-bit
    
      _STATISTICS_WRITING_APP-eng: mkvmerge v20.0.0 ('I Am The Sun') 64-bit
    
      _STATISTICS_WRITING_DATE_UTC: 2018-01-23 22:07:33
    
      _STATISTICS_WRITING_DATE_UTC-eng: 2018-01-23 22:07:33
    
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    
File 'output.mp4' already exists. Overwrite ? [y/N] y
    
[mp4 @ 000002935ee0ff00] track 1: codec frame size is not set
    
Output #0, mp4, to 'output.mp4':
    
  Metadata:
    
    title           : claucha75
    
    encoder         : Lavf58.33.100
    
    Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 23.98 fps, 23.98 tbr, 16k tbn, 1k tbc (default)
    
    Metadata:
    
      title           : claucha75
    
      BPS             : 4146894
    
      BPS-eng         : 4146894
    
      DURATION        : 01:37:12.952000000
    
      DURATION-eng    : 01:37:12.952000000
    
      NUMBER_OF_FRAMES: 139851
    
      NUMBER_OF_FRAMES-eng: 139851
    
      NUMBER_OF_BYTES : 3023579528
    
      NUMBER_OF_BYTES-eng: 3023579528
    
      _STATISTICS_WRITING_APP: mkvmerge v20.0.0 ('I Am The Sun') 64-bit
    
      _STATISTICS_WRITING_APP-eng: mkvmerge v20.0.0 ('I Am The Sun') 64-bit
    
      _STATISTICS_WRITING_DATE_UTC: 2018-01-23 22:07:33
    
      _STATISTICS_WRITING_DATE_UTC-eng: 2018-01-23 22:07:33
    
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    
    Stream #0:1(spa): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, 5.1(side), fltp, 448 kb/s (default)
    
    Metadata:
    
      title           : Latino
    
      BPS             : 448000
    
      BPS-eng         : 448000
    
      DURATION        : 01:37:13.888000000
    
      DURATION-eng    : 01:37:13.888000000
    
      NUMBER_OF_FRAMES: 182309
    
      NUMBER_OF_FRAMES-eng: 182309
    
      NUMBER_OF_BYTES : 326697728
    
      NUMBER_OF_BYTES-eng: 326697728
    
      _STATISTICS_WRITING_APP: mkvmerge v20.0.0 ('I Am The Sun') 64-bit
    
      _STATISTICS_WRITING_APP-eng: mkvmerge v20.0.0 ('I Am The Sun') 64-bit
    
      _STATISTICS_WRITING_DATE_UTC: 2018-01-23 22:07:33
    
      _STATISTICS_WRITING_DATE_UTC-eng: 2018-01-23 22:07:33
    
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
  Stream #0:1 -> #0:1 (copy)
    
Press [q] to stop, [?] for help
    
frame=139851 fps=2149 q=-1.0 Lsize= 3275868kB time=01:37:13.85 bitrate=4600.0kbits/s speed=89.7x
    
video:2952714kB audio:319041kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.125715%

    The command produces a MP4 file. The file takes a long time to open and then it takes several more minutes for a frame to appear. The converted file is also missing audio.

    Does anyone have an idea about the slow loading time and missing audio ?

  • Having trouble compiling ffmpeg code in command terminal

    10 septembre 2019, par m00ncake

    I am having a bit of trouble compiling my c++ code in my terminal. I have ffmpeg installed as shown below.

    ffmpeg version n4.1 Copyright (c) 2000-2018 the FFmpeg developers
    
  built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
    
  configuration: --enable-gpl --enable-version3 --disable-static --enable-shared --enable-small --enable-avisynth --enable-chromaprint --enable-frei0r --enable-gmp --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-librtmp --enable-libshine --enable-libsmbclient --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtesseract --enable-libtheora --enable-libtwolame --enable-libv4l2 --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libxml2 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-libmysofa --enable-openal --enable-opencl --enable-opengl --enable-libdrm
    
  libavutil      56. 22.100 / 56. 22.100
    
  libavcodec     58. 35.100 / 58. 35.100
    
  libavformat    58. 20.100 / 58. 20.100
    
  libavdevice    58.  5.100 / 58.  5.100
    
  libavfilter     7. 40.101 /  7. 40.101
    
  libswscale      5.  3.100 /  5.  3.100
    
  libswresample   3.  3.100 /  3.  3.100
    
  libpostproc    55.  3.100 / 55.  3.100
    
Hyper fast Audio and Video encoder
    
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

    However, when I compile my c++ code, currently trying to get NTP timestamps from private data in ffmpeg but I need to include their headers ? I have looked into ffmpeg’s libavformat folder and it does have rtpdec.h but when I compile it in the command line, i get this error. (trying to include this header for RTSPState and RTSPStream as well as RTPDemuxContext)

    cf.cpp:11:10: fatal error: libavformat/rtsp.h: No such file or directory
    
 #include <libavformat></libavformat>rtpdec.h>
    
          ^~~~~~~~~~~~~~~~~~~~
    
compilation terminated.

    This is my code :

    #include 
    
#include 
    
#include <iostream>
    
#include <fstream>
    
#include <sstream>
    

    
extern "C" {
    
#include <libavcodec></libavcodec>avcodec.h>
    
#include <libavformat></libavformat>avformat.h>
    
#include <libavformat></libavformat>avio.h>
    
#include <libavformat></libavformat>rtpdec.h>
    
#include <libswscale></libswscale>swscale.h>
    
}
    

    
int main(int argc, char** argv) {
    

    
    // Open the initial context variables that are needed
    
    SwsContext *img_convert_ctx;
    
    AVFormatContext* format_ctx = avformat_alloc_context();
    
    AVCodecContext* codec_ctx = NULL;
    
    int video_stream_index;
    
    uint32_t* last_rtcp_ts;
    
    double* base_time;
    
    double* time;
    

    
    // Register everything
    
    av_register_all();
    
    avformat_network_init();
    

    
    //open RTSP
    
    if (avformat_open_input(&amp;format_ctx, "rtsp://admin:password@192.168.1.67:554",
    
            NULL, NULL) != 0) {
    
        return EXIT_FAILURE;
    
    }
    

    
    if (avformat_find_stream_info(format_ctx, NULL) &lt; 0) {
    
        return EXIT_FAILURE;
    
    }
    

    
    //search video stream
    
    for (int i = 0; i &lt; format_ctx->nb_streams; i++) {
    
        if (format_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
    
            video_stream_index = i;
    
    }
    

    
    AVPacket packet;
    
    av_init_packet(&amp;packet);
    

    
    //open output file
    
    AVFormatContext* output_ctx = avformat_alloc_context();
    

    
    AVStream* stream = NULL;
    
    int cnt = 0;
    

    
    //start reading packets from stream and write them to file
    
    av_read_play(format_ctx);    //play RTSP
    

    
    // Get the codec
    
    AVCodec *codec = NULL;
    
    codec = avcodec_find_decoder(AV_CODEC_ID_H264);
    
    if (!codec) {
    
        exit(1);
    
    }
    

    
// Add this to allocate the context by codec
    
codec_ctx = avcodec_alloc_context3(codec);
    

    
avcodec_get_context_defaults3(codec_ctx, codec);
    
avcodec_copy_context(codec_ctx, format_ctx->streams[video_stream_index]->codec);
    
std::ofstream output_file;
    

    
if (avcodec_open2(codec_ctx, codec, NULL) &lt; 0)
    
    exit(1);
    

    
    img_convert_ctx = sws_getContext(codec_ctx->width, codec_ctx->height,
    
            codec_ctx->pix_fmt, codec_ctx->width, codec_ctx->height, AV_PIX_FMT_RGB24,
    
            SWS_BICUBIC, NULL, NULL, NULL);
    

    
    int size = avpicture_get_size(AV_PIX_FMT_YUV420P, codec_ctx->width,
    
            codec_ctx->height);
    
    uint8_t* picture_buffer = (uint8_t*) (av_malloc(size));
    
    AVFrame* picture = av_frame_alloc();
    
    AVFrame* picture_rgb = av_frame_alloc();
    
    int size2 = avpicture_get_size(AV_PIX_FMT_RGB24, codec_ctx->width,
    
            codec_ctx->height);
    
    uint8_t* picture_buffer_2 = (uint8_t*) (av_malloc(size2));
    
    avpicture_fill((AVPicture *) picture, picture_buffer, AV_PIX_FMT_YUV420P,
    
            codec_ctx->width, codec_ctx->height);
    
    avpicture_fill((AVPicture *) picture_rgb, picture_buffer_2, AV_PIX_FMT_RGB24,
    
            codec_ctx->width, codec_ctx->height);
    

    
    while (av_read_frame(format_ctx, &amp;packet) >= 0 &amp;&amp; cnt &lt; 1000) { //read ~ 1000 frames
    

    
        RTSPState* rt = format_ctx->priv_data;
    
        RTSPStream *rtsp_stream = rt->rtsp_streams[0];
    
        RTPDemuxContext* rtp_demux_context = rtsp_stream->transport_priv;
    
        uint32_t new_rtcp_ts = rtp_demux_context->last_rtcp_timestamp;
    
        uint64_t last_ntp_time = 0;
    

    
        if (new_rtcp_ts != *last_rtcp_ts) {
    
            *last_rtcp_ts = new_rtcp_ts;
    
            last_ntp_time = rtp_demux_context->last_rtcp_ntp_time;
    
            uint32_t seconds = ((last_ntp_time >> 32) &amp; 0xffffffff) - 2208988800;
    
            uint32_t fraction  = (last_ntp_time &amp; 0xffffffff);
    
            double useconds = ((double) fraction / 0xffffffff);
    
            *base_time = seconds + useconds;
    
            uint32_t d_ts = rtp_demux_context->timestamp - *last_rtcp_ts;
    
            *time = *base_time + d_ts / 90000.0;
    
            std::cout &lt;&lt; "Time is: " &lt;&lt; *time &lt;&lt; std::endl;
    
        }
    

    
        std::cout &lt;&lt; "1 Frame: " &lt;&lt; cnt &lt;&lt; std::endl;
    
        if (packet.stream_index == video_stream_index) {    //packet is video
    
            std::cout &lt;&lt; "2 Is Video" &lt;&lt; std::endl;
    
            if (stream == NULL) {    //create stream in file
    
                std::cout &lt;&lt; "3 create stream" &lt;&lt; std::endl;
    
                stream = avformat_new_stream(output_ctx,
    
                        format_ctx->streams[video_stream_index]->codec->codec);
    
                avcodec_copy_context(stream->codec,
    
                        format_ctx->streams[video_stream_index]->codec);
    
                stream->sample_aspect_ratio =
    
                        format_ctx->streams[video_stream_index]->codec->sample_aspect_ratio;
    
            }
    
            int check = 0;
    
            packet.stream_index = stream->id;
    
            std::cout &lt;&lt; "4 decoding" &lt;&lt; std::endl;
    
            int result = avcodec_decode_video2(codec_ctx, picture, &amp;check, &amp;packet);
    
            std::cout &lt;&lt; "Bytes decoded " &lt;&lt; result &lt;&lt; " check " &lt;&lt; check
    
                    &lt;&lt; std::endl;
    
            if (cnt > 100)    //cnt &lt; 0)
    
                    {
    
                sws_scale(img_convert_ctx, picture->data, picture->linesize, 0,
    
                        codec_ctx->height, picture_rgb->data, picture_rgb->linesize);
    
                std::stringstream file_name;
    
                file_name &lt;&lt; "test" &lt;&lt; cnt &lt;&lt; ".ppm";
    
                output_file.open(file_name.str().c_str());
    
                output_file &lt;&lt; "P3 " &lt;&lt; codec_ctx->width &lt;&lt; " " &lt;&lt; codec_ctx->height
    
                        &lt;&lt; " 255\n";
    
                for (int y = 0; y &lt; codec_ctx->height; y++) {
    
                    for (int x = 0; x &lt; codec_ctx->width * 3; x++)
    
                        output_file
    
                                &lt;&lt; (int) (picture_rgb->data[0]
    
                                        + y * picture_rgb->linesize[0])[x] &lt;&lt; " ";
    
                }
    
                output_file.close();
    
            }
    
            cnt++;
    
        }
    
        av_free_packet(&amp;packet);
    
        av_init_packet(&amp;packet);
    
    }
    
    av_free(picture);
    
    av_free(picture_rgb);
    
    av_free(picture_buffer);
    
    av_free(picture_buffer_2);
    

    
    av_read_pause(format_ctx);
    
    avio_close(output_ctx->pb);
    
    avformat_free_context(output_ctx);
    

    
    return (EXIT_SUCCESS);
    
}
    
</sstream></fstream></iostream>

    The command i use to compile my code : g++ -w cf.cpp -o cf $(pkg-config --cflags --libs libavformat libswscale libavcodec)

    I am a bit new to coding in FFmpeg.

  • OpenCV encoding to H264

    29 mars 2018, par Yost777

    I want to encode images to H264 video in OpenCV.

    As part of my software for image tracking, I’m using VideoWriter in OpenCV 3.4 (64-bit) with Visual Studio 2017 C++. I use ffmpeg for manual encoding, and as it comes with OpenCV I assume this is the best option. My version of OpenCV indicates it has been compiled with ffmpeg, and I can verify it loads the opencv_ffmpeg340_64.dll.

    Decoding H264 (AVC1) is absolutely fine, including when specifically using the ffmpeg API. But encoding anything other than MJPG or raw images doesn’t work :
    VideoWriter.Open() mostly returns false, for some cases it only writes an empty or small header but won’t write frames. I’ve tried not only the ffmpeg API, but also any available API. Redirecting console/debug output to intermediate window in VC doesn’t give any messages from OpenCV or ffmpeg.

    There are numerous posts on previous versions of OpenCV using FFmpeg, including (Cisco) OpenH264 library and difficulties using this. I’ve tried many options, installing codecs pack including H264, ffmpeg static version, Cisco openH264 library, setting paths etc and even tried the low level ffmpeg library functions such as cvCreateVideoWriter exposed in OpenCV, and using different video containers (AVI, MPG, MP4) as well as fourcc strings.

    I can’t believe in 2018 the great OpenCV with FFmpeg support is unable to encode anything but arcane MJPG or raw images. If it uses FFmpeg surely a significant set of functionality should be available ?

    Though I think this should work, my next best option would be using a separate ffmpeg library, which would ironically add another ffmpeg.dll to my solution I imagine. Any suggestion appreciated !

    Code fragment (using any video encoding API) :

    VideoWriter writer;
    
int codec = VideoWriter::fourcc('X', '2', '6', '4');
    
writer.open("test.avi", codec, 30, colorImage.size(), true);
    
writer.write(colorImage);
    
writer.release();

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