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  • L’utiliser, en parler, le critiquer

    10 avril 2011

    La première attitude à adopter est d’en parler, soit directement avec les personnes impliquées dans son développement, soit autour de vous pour convaincre de nouvelles personnes à l’utiliser.
    Plus la communauté sera nombreuse et plus les évolutions seront rapides ...
    Une liste de discussion est disponible pour tout échange entre utilisateurs.

  • Gestion des droits de création et d’édition des objets

    8 février 2011, par

    Par défaut, beaucoup de fonctionnalités sont limitées aux administrateurs mais restent configurables indépendamment pour modifier leur statut minimal d’utilisation notamment : la rédaction de contenus sur le site modifiables dans la gestion des templates de formulaires ; l’ajout de notes aux articles ; l’ajout de légendes et d’annotations sur les images ;

  • Mediabox : ouvrir les images dans l’espace maximal pour l’utilisateur

    8 février 2011, par

    La visualisation des images est restreinte par la largeur accordée par le design du site (dépendant du thème utilisé). Elles sont donc visibles sous un format réduit. Afin de profiter de l’ensemble de la place disponible sur l’écran de l’utilisateur, il est possible d’ajouter une fonctionnalité d’affichage de l’image dans une boite multimedia apparaissant au dessus du reste du contenu.
    Pour ce faire il est nécessaire d’installer le plugin "Mediabox".
    Configuration de la boite multimédia
    Dès (...)

Sur d’autres sites (13016)

  • .MKV to .MP4 choosing the audio and subtitles ?

    11 décembre 2016, par Leo Letto

    The following stream belongs to a .mkv file with dual audio ;

    Stream #0:0: Video: h264 (High), yuv420p(progressive), 1280x960 [SAR 1:1 DAR 4:3], 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc (default)
    
Stream #0:1(eng): Audio: mp3, 48000 Hz, stereo, s16p, 256 kb/s (default)
    
Stream #0:2(por): Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
    
Stream #0:3(eng): Subtitle: ass (default)

    Which ffmpeg command should I use to create an output with the language in Portuguese, already with the English subtitles ?

    I found some commands that can extract the language-based caption that I specify, but I didn’t find anything related to selecting the audio type.

    This is the entire output from ffmpeg :

    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
    
  libavutil      55. 41.101 / 55. 41.101
    
  libavcodec     57. 66.108 / 57. 66.108
    
  libavformat    57. 58.101 / 57. 58.101
    
  libavdevice    57.  2.100 / 57.  2.100
    
  libavfilter     6. 67.100 /  6. 67.100
    
  libswscale      4.  3.101 /  4.  3.101
    
  libswresample   2.  4.100 /  2.  4.100
    
  libpostproc    54.  2.100 / 54.  2.100
    
Input #0, matroska,webm, from 'mydualmkv.mkv':
    
  Metadata:
    
    title           : Avidemux
    
    encoder         : libebml v1.2.3 + libmatroska v1.3.0
    
    creation_time   : 2015-08-04T15:25:49.000000Z
    
  Duration: 00:23:37.44, start: 0.000000, bitrate: 1908 kb/s
    
    Stream #0:0: Video: h264 (High), yuv420p(progressive), 1280x960 [SAR 1:1 DAR 4:3], 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc (default)
    
    Stream #0:1(eng): Audio: mp3, 48000 Hz, stereo, s16p, 256 kb/s (default)
    
    Stream #0:2(pot): Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
    
    Stream #0:3(eng): Subtitle: ass (default)
    
[mp4 @ 0000000000c36700] track 1: codec frame size is not set
    
Output #0, mp4, to 'path-to-output.mp4':
    
  Metadata:
    
    title           : Avidemux
    
    encoder         : Lavf57.58.101
    
    Stream #0:0: Video: h264 (High) ([33][0][0][0] / 0x0021), yuv420p(progressive), 1280x960 [SAR 1:1 DAR 4:3], q=2-31, 29.97 fps, 29.97 tbr, 16k tbn, 1k tbc (default)
    
    Stream #0:1(por): Audio: ac3 ([165][0][0][0] / 0x00A5), 48000 Hz, stereo, fltp, 192 kb/s
    
    Stream #0:2(eng): Subtitle: mov_text ([8][0][0][0] / 0x0008) (default)
    
    Metadata:
    
      encoder         : Lavc57.66.108 mov_text
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
  Stream #0:2 -> #0:1 (copy)
    
  Stream #0:3 -> #0:2 (ass (ssa) -> mov_text (native))
    
Press [q] to stop, [?] for help
    
frame= 5451 fps=0.0 q=-1.0 size=   39273kB time=00:03:01.89 bitrate=1768.7kbits/s speed= 363x    
    
frame=11708 fps=11695 q=-1.0 size=   79743kB time=00:06:30.62 bitrate=1672.3kbits/s speed= 390x    
    
frame=17902 fps=11926 q=-1.0 size=  122134kB time=00:09:57.60 bitrate=1674.2kbits/s speed= 398x    
    
frame=24717 fps=12352 q=-1.0 size=  166885kB time=00:13:44.83 bitrate=1657.4kbits/s speed= 412x    
    
frame=31995 fps=12792 q=-1.0 size=  211010kB time=00:17:47.74 bitrate=1618.9kbits/s speed= 427x    
    
frame=38979 fps=12988 q=-1.0 size=  260758kB time=00:21:40.64 bitrate=1642.4kbits/s speed= 433x    
    
frame=42478 fps=13076 q=-1.0 Lsize=  286844kB time=00:23:37.31 bitrate=1657.9kbits/s speed= 436x    
    
video:252490kB audio:33218kB subtitle:11kB other streams:0kB global headers:0kB muxing overhead: 0.393387%

  • FFMPEG is really slow at extracting subtitles

    3 mars 2021, par Gustav P Svensson

    I'm trying to extract the subtitles from a 1080P video, around 40min long. I'm currently using this command (using fluent-ffmpeg in node, but the translated command is this) :

    


    ffmpeg -threads 3  -map 0: -c copy 


    


    This command takes about 20-30 min to complete. I've searched quite a lot on how to speed up this process, if I look at my task manager I can see that ffmpeg is using 0.1% of the CPU which makes me think that it's possible to speed up this process.

    


    I'm not sure if the -threads option is actually doing anything when extracting subtitles but I don't think it should make it slower atleast ?

    


    So my question is, is it possible to speed up this process ? I appriciate any help.

    


    Full FFMPEG log:
fmpeg version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, matroska,webm, from '/home/test.mkv:
  Metadata:
    encoder         : libebml v1.3.6 + libmatroska v1.4.9
    creation_time   : 2019-03-14T16:46:55.000000Z
  Duration: 00:41:20.29, start: 0.000000, bitrate: 6430 kb/s
    Stream #0:0: Video: h264 (Main), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
    Metadata:
      BPS-eng         : 5788926
      DURATION-eng    : 00:41:20.020000000
      NUMBER_OF_FRAMES-eng: 59461
      NUMBER_OF_BYTES-eng: 1794581562
      _STATISTICS_WRITING_APP-eng: mkvmerge v31.0.0 ('Dolores In A Shoestand') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2019-03-14 16:46:55
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:1(eng): Audio: eac3, 48000 Hz, 5.1(side), fltp, 640 kb/s (default)
    Metadata:
      title           : English
      BPS-eng         : 640000
      DURATION-eng    : 00:41:20.288000000
      NUMBER_OF_FRAMES-eng: 77509
      NUMBER_OF_BYTES-eng: 198423040
      _STATISTICS_WRITING_APP-eng: mkvmerge v31.0.0 ('Dolores In A Shoestand') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2019-03-14 16:46:55
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:2(eng): Subtitle: subrip
    Metadata:
      BPS-eng         : 80
      DURATION-eng    : 00:40:22.295000000
      NUMBER_OF_FRAMES-eng: 645
      NUMBER_OF_BYTES-eng: 24473
      _STATISTICS_WRITING_APP-eng: mkvmerge v31.0.0 ('Dolores In A Shoestand') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2019-03-14 16:46:55
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:3(eng): Subtitle: subrip
    Metadata:
      title           : SDH
      BPS-eng         : 86
      DURATION-eng    : 00:40:31.012000000
      NUMBER_OF_FRAMES-eng: 709
      NUMBER_OF_BYTES-eng: 26142
      _STATISTICS_WRITING_APP-eng: mkvmerge v31.0.0 ('Dolores In A Shoestand') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2019-03-14 16:46:55
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Output #0, srt, to 'test6.srt':
  Metadata:
    encoder         : Lavf57.83.100
    Stream #0:0(eng): Subtitle: subrip
    Metadata:
      BPS-eng         : 80
      DURATION-eng    : 00:40:22.295000000
      NUMBER_OF_FRAMES-eng: 645
      NUMBER_OF_BYTES-eng: 24473
      _STATISTICS_WRITING_APP-eng: mkvmerge v31.0.0 ('Dolores In A Shoestand') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2019-03-14 16:46:55
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Stream mapping:
  Stream #0:2 -> #0:0 (copy)
Press [q] to stop, [?] for help
size=      46kB time=00:40:36.68 bitrate=   0.2kbits/s speed=11.6x    
video:0kB audio:0kB subtitle:24kB other streams:0kB global headers:0kB muxing overhead: 94.438766%


    


  • Output black when I decode h264 720p with ffmpeg

    6 décembre 2017, par José Marqueses Saxo

    First, sorry for my english. When I decode h264 720p in ardrone2.0 my output is black and I cant see anything.

    I have try to change the value of pCodecCtx->pix_fmt = AV_PIX_FMT_BGR24; to pCodecCtx->pix_fmt = AV_PIX_FMT_YUV420P; and the value of pCodecCtxH264->pix_fmt = AV_PIX_FMT_BGR24; to pCodecCtxH264->pix_fmt = AV_PIX_FMT_YUV420P; but my program crash. What am I doing wrong ?. Thank you, see part of my code :

    av_register_all();
    
avcodec_register_all();
    
avformat_network_init();
    

    
// 1.2. Open video file
    
if(avformat_open_input(&pFormatCtx, drone_addr, NULL, NULL) != 0) {
    
  mexPrintf("No conecct with Drone");
    
  EndVideo();
    
  return;
    
}
    

    
pCodec    = avcodec_find_decoder(AV_CODEC_ID_H264);
    

    
pCodecCtx = avcodec_alloc_context3(pCodec);
    
pCodecCtx->pix_fmt = AV_PIX_FMT_BGR24;
    
pCodecCtx->skip_frame = AVDISCARD_DEFAULT;
    
pCodecCtx->error_concealment = FF_EC_GUESS_MVS | FF_EC_DEBLOCK;
    
pCodecCtx->err_recognition = AV_EF_CAREFUL;
    
pCodecCtx->skip_loop_filter = AVDISCARD_DEFAULT;
    
pCodecCtx->workaround_bugs = FF_BUG_AUTODETECT;
    
pCodecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
    
pCodecCtx->codec_id = AV_CODEC_ID_H264;
    
pCodecCtx->skip_idct = AVDISCARD_DEFAULT;
    
pCodecCtx->width = 1280;
    
pCodecCtx->height = 720;
    

    
pCodecH264 = avcodec_find_decoder(AV_CODEC_ID_H264);
    
pCodecCtxH264 = avcodec_alloc_context3(pCodecH264);
    

    

    
pCodecCtxH264->pix_fmt = AV_PIX_FMT_BGR24;
    
pCodecCtxH264->skip_frame = AVDISCARD_DEFAULT;
    
pCodecCtxH264->error_concealment = FF_EC_GUESS_MVS | FF_EC_DEBLOCK;
    
pCodecCtxH264->err_recognition = AV_EF_CAREFUL;
    
pCodecCtxH264->skip_loop_filter = AVDISCARD_DEFAULT;
    
pCodecCtxH264->workaround_bugs = FF_BUG_AUTODETECT;
    
pCodecCtxH264->codec_type = AVMEDIA_TYPE_VIDEO;
    
pCodecCtxH264->codec_id = AV_CODEC_ID_H264;
    
pCodecCtxH264->skip_idct = AVDISCARD_DEFAULT;
    

    
if(avcodec_open2(pCodecCtxH264, pCodecH264, &optionsDict) < 0)
    
{
    
   mexPrintf("Error opening H264 codec");
    
   return ;
    
}
    

    
pFrame_BGR24 = av_frame_alloc();
    

    

    
if(pFrame_BGR24 == NULL) {
    
   mexPrintf("Could not allocate pFrame_BGR24\n");
    
   return ;
    
}
    

    
// Determine required buffer size and allocate buffer
    

    
buffer_BGR24 = 
    
(uint8_t *)av_mallocz(av_image_get_buffer_size(AV_PIX_FMT_BGR24, 
    
pCodecCtx->width, ((pCodecCtx->height == 720) ? 720 : pCodecCtx->height) * 
    
sizeof(uint8_t)*3,1));
    

    
// Assign buffer to image planes
    

    
av_image_fill_arrays(pFrame_BGR24->data, pFrame_BGR24->linesize,
    
buffer_BGR24,AV_PIX_FMT_BGR24, pCodecCtx->width, pCodecCtx->height,1);
    

    
// format conversion context
    
pConvertCtx_BGR24 = sws_getContext(pCodecCtx->width, pCodecCtx->height, 
    
pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height,  AV_PIX_FMT_BGR24, 
    
                                 SWS_BILINEAR | SWS_ACCURATE_RND, 0, 0, 0);
    

    
// 1.6. get video frames
    
pFrame = av_frame_alloc();
    

    
av_init_packet(&packet);
    
packet.data = NULL;
    
packet.size = 0;
    
}
    

    
//Captura un frame
    
void video::capture(mxArray *plhs[]) {
    

    
  if(av_read_frame(pFormatCtx, &packet) < 0){
    
      mexPrintf("Error al leer frame");
    
      return;
    
  }
    
   do {
    
       do {
    
          rest = avcodec_send_packet(pCodecCtxH264, &packet);
    
       } while(rest == AVERROR(EAGAIN));
    

    
       if(rest == AVERROR_EOF || rest == AVERROR(EINVAL)) {
    
                printf("AVERROR(EAGAIN): %d, AVERROR_EOF: %d, 
    
                AVERROR(EINVAL): %d\n", AVERROR(EAGAIN), AVERROR_EOF, 
    
                AVERROR(EINVAL));
    
            printf("fe_read_frame: Frame getting error (%d)!\n", rest);
    
            return;
    
       }
    

    
       rest = avcodec_receive_frame(pCodecCtxH264, pFrame);
    
   } while(rest == AVERROR(EAGAIN));
    

    
   if(rest == AVERROR_EOF || rest == AVERROR(EINVAL)) {
    

    
    // An error or EOF occured,index break out and return what
    
    // we have so far.
    
      printf("AVERROR(EAGAIN): %d, AVERROR_EOF: %d, AVERROR(EINVAL): %d\n", 
    
      AVERROR(EAGAIN), AVERROR_EOF, AVERROR(EINVAL));
    
        printf("fe_read_frame: EOF or some othere decoding error (%d)!\n", 
    
        rest);
    
        return;
    
   }
    

    

    
   // 2.1.1. convert frame to GRAYSCALE [or BGR] for OpenCV
    
   sws_scale(pConvertCtx_BGR24,   (const uint8_t* const*)pFrame->data, 
    
       pFrame->linesize, 0,pCodecCtx->height,   pFrame_BGR24->data,   
    
             pFrame_BGR24->linesize);
    
//}
    
   av_packet_unref(&packet);
    
   av_init_packet(&packet);
    
   mwSize dims[] = {(pCodecCtx->width)*((pCodecCtx->height == 720) ? 720 : 
    
   pCodecCtx->height)*sizeof(uint8_t)*3};
    
   plhs[0] = mxCreateNumericArray(1,dims,mxUINT8_CLASS, mxREAL);
    
    //plhs[0]=mxCreateDoubleMatrix(pCodecCtx->height,pCodecCtx-
    
    >width,mxREAL);
    
   point=mxGetPr(plhs[0]);
    
   memcpy(point, pFrame_BGR24->data[0],(pCodecCtx->width)*(pCodecCtx-
    
    >height)*sizeof(uint8_t)*3);
    
}

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