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  • Mise à jour de la version 0.1 vers 0.2

    24 juin 2013, par

    Explications des différents changements notables lors du passage de la version 0.1 de MediaSPIP à la version 0.3. Quelles sont les nouveautés
    Au niveau des dépendances logicielles Utilisation des dernières versions de FFMpeg (>= v1.2.1) ; Installation des dépendances pour Smush ; Installation de MediaInfo et FFprobe pour la récupération des métadonnées ; On n’utilise plus ffmpeg2theora ; On n’installe plus flvtool2 au profit de flvtool++ ; On n’installe plus ffmpeg-php qui n’est plus maintenu au (...)

  • Personnaliser en ajoutant son logo, sa bannière ou son image de fond

    5 septembre 2013, par

    Certains thèmes prennent en compte trois éléments de personnalisation : l’ajout d’un logo ; l’ajout d’une bannière l’ajout d’une image de fond ;

  • Ecrire une actualité

    21 juin 2013, par

    Présentez les changements dans votre MédiaSPIP ou les actualités de vos projets sur votre MédiaSPIP grâce à la rubrique actualités.
    Dans le thème par défaut spipeo de MédiaSPIP, les actualités sont affichées en bas de la page principale sous les éditoriaux.
    Vous pouvez personnaliser le formulaire de création d’une actualité.
    Formulaire de création d’une actualité Dans le cas d’un document de type actualité, les champs proposés par défaut sont : Date de publication ( personnaliser la date de publication ) (...)

Sur d’autres sites (9996)

  • Encoding with ffmpeg : video quality drops

    21 mai 2014, par Adi Ulici

    I’m trying to encode a set of pictures into a video with ffmpeg. I’m new to this stuff, but I managed to get it work. I have only one problem : the first second or two of video look good but as the time goes the video quality keeps dropping and dropping. At the end (it’s a video of about 16 seconds) the quality is really bad and I can’t understand why.

    I’m using AV_CODEC_ID_MPEG1VIDEO as video codec (frankly, it’s the only one I could make work) and here is a sample of my code :

    c = avcodec_alloc_context3(codec);
    
if (!c) {
    
    fprintf(stderr, "Could not allocate video codec context\n");
    
    exit(1);
    
}
    

    
c->bit_rate = 400000;
    
c->width = width;
    
c->height = height;
    
struct AVRational time_base = {1, 25};
    
c->time_base = time_base;
    
c->gop_size = 10;
    
c->max_b_frames = 1;
    
c->pix_fmt = AV_PIX_FMT_YUV420P;
    

    
if (codec_id == AV_CODEC_ID_H264)
    
    av_opt_set(c->priv_data, "preset", "slow", 0);
    

    
// Open the codec
    
if (avcodec_open2(c, codec, NULL) < 0) {
    
    fprintf(stderr, "Could not open codec\n");
    
    exit(1);
    
}
    

    
fopen_s(&f, filename, "wb");
    
if (!f) {
    
    fprintf(stderr, "Could not open %s\n", filename);
    
    exit(1);
    
}
    

    
frame = av_frame_alloc();
    
if (!frame) {
    
    fprintf(stderr, "Could not allocate video frame\n");
    
    exit(1);
    
}
    
frame->format = c->pix_fmt;
    
frame->width  = c->width;
    
frame->height = c->height;
    

    
ret = av_image_alloc(frame->data, frame->linesize, c->width, c->height,
    
                     c->pix_fmt, 32);
    
if (ret < 0) {
    
    fprintf(stderr, "Could not allocate raw picture buffer\n");
    
    exit(1);
    
}
    

    
struct SwsContext *frameConvertContext = sws_getContext(width, height,
    
      PIX_FMT_RGB24,
    
      c->width, c->height,
    
      c->pix_fmt,
    
      SWS_LANCZOS | SWS_ACCURATE_RND, NULL, NULL, NULL);
    

    
for (i = 0; i < framesNr; i++) {
    
    // Read an image
    
    std::stringstream filename;
    
    filename << "input/image-" << (i+1) << ".jpg";
    
    Image* img;
    
    img = Image::fromJpeg((char*) filename.str().c_str());
    
    int srcSliceY[1] = { img->getWidth() * 3 };
    
    const uint8_t* imgbuf[1] = { (uint8_t*) img->getData(sizeof(uint8_t)) };
    

    
    av_init_packet(&pkt);
    
    pkt.data = NULL;
    
    pkt.size = 0;
    

    
    fflush(stdout);
    
    frameConvertContext = sws_getCachedContext(frameConvertContext, width, height,
    
      PIX_FMT_RGB24,
    
      c->width, c->height,
    
      c->pix_fmt,
    
      SWS_LANCZOS | SWS_ACCURATE_RND, NULL, NULL, NULL);
    

    
    sws_scale(frameConvertContext, imgbuf, srcSliceY, 0, img->getHeight(), frame->data, frame->linesize);
    

    
    frame->pts = i;
    

    
    /* encode the image */
    
    ret = avcodec_encode_video2(c, &pkt, frame, &got_output);
    
    if (ret < 0) {
    
        fprintf(stderr, "Error encoding frame\n");
    
        exit(1);
    
    }
    

    
    if (got_output) {
    
        printf(".");
    
        fwrite(pkt.data, 1, pkt.size, f);
    
        av_free_packet(&pkt);
    
    }
    

    
    // Free the memory
    
    delete img;
    
}

    Any tips ? Thanks a lot !

  • Encoding video using FFmpeg and FreeImage

    14 mai 2014, par mike

    I have to make a video encoder to encode video using mjpeg codec from many jpgs saved on the disk. I use FreeImage to load images and ffmpeg to encode. Unfortunately, the output video isn’t that what I expect. I can’t play it in MPC. VLC can play it but there is only a single quick flash of the last picture I loaded. I want to have 1 fps video and for example I loaded 4 frames so my video should last 4 seconds.

    Input pictures are in BGR24 pixel format.

    What is more, when I run my code I got swscaler warning that picture format YUVJ420P is deprecated but I cant find another pixel format which is suitable for MJPEG codec.

    Here is my source code :

    AVPixelFormat in_pix_fmt = AV_PIX_FMT_BGR24;
    
AVPixelFormat out_pix_fmt = AV_PIX_FMT_YUVJ420P;
    

    
AVCodec *pCodec;
    
AVCodecContext *pCodecCtx = NULL;
    
int out_size = 0;
    
int size, outbuf_size, i, outpic_size, w, h;
    
FILE *file;
    
const char *videofile_name = "test_video_cpp.avi";
    
AVFrame *picture, *outpic;
    
uint8_t *outbuf, *picture_buf, *outpic_buf;
    

    
av_register_all();
    

    
pCodec = avcodec_find_encoder(CODEC_ID_MJPEG);
    
if (!pCodec)
    
{
    
    cout << "Codec not found\n\n";
    
    return 1;
    
}
    

    
pCodecCtx = avcodec_alloc_context3(pCodec);
    
picture = avcodec_alloc_frame();
    
outpic = avcodec_alloc_frame();
    

    
pCodecCtx->codec_id = CODEC_ID_MJPEG;
    
pCodecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
    
pCodecCtx->pix_fmt = out_pix_fmt;
    
pCodecCtx->bit_rate = 400000;
    
pCodecCtx->width = 1688;            
    
pCodecCtx->height = 728;
    
pCodecCtx->time_base.num = 1;           
    
pCodecCtx->time_base.den = 1;       //fps
    
pCodecCtx->max_b_frames = 0;
    

    
outbuf_size = 500000;
    
outbuf = new uint8_t[outbuf_size];
    

    
if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0)     //open codec
    
{
    
    cout << "Could not open codec\n";
    
    exit(1);
    
}
    

    
file = fopen(videofile_name, "wb");                 //open file
    
if (!file)
    
{
    
    cout << "Could not open " << videofile_name << endl;
    
    exit(1);
    
}
    

    
outpic_size = avpicture_get_size(out_pix_fmt, pCodecCtx->width, pCodecCtx->height);
    
outpic_buf = new uint8_t[outpic_size];
    
cout << "Outpic size was setted to: " << outpic_size << endl;
    

    
size = pCodecCtx->width * pCodecCtx->height;
    
picture_buf = new uint8_t[size * 3];
    

    

    
for (i = 1; i < 5; i++) 
    
{   
    
    fflush(stdout);
    

    
    stringstream ss;
    
    ss << i;
    
    filename = name + ss.str() + ext;
    
    path = dir + filename;
    

    
    dib = FreeImage_Load(FIF_JPEG, path.c_str(), 0);
    

    
    picture_buf = FreeImage_GetBits(dib);
    

    
            h = FreeImage_GetHeight(dib);
    
    w = FreeImage_GetWidth(dib);
    

    
    avpicture_fill((AVPicture*)picture, picture_buf, in_pix_fmt, w, h);
    
    avpicture_fill((AVPicture*)outpic, outpic_buf, out_pix_fmt, pCodecCtx->width, pCodecCtx->height);
    

    
    struct SwsContext* fooContext = sws_getContext(w, h, in_pix_fmt, pCodecCtx->width, pCodecCtx->height, out_pix_fmt, SWS_BICUBIC, NULL, NULL, NULL);
    

    
    sws_scale(fooContext, picture->data, picture->linesize, 0, pCodecCtx->height, outpic->data, outpic->linesize);
    

    
    //encode single frame
    
    out_size = avcodec_encode_video(pCodecCtx, outpic_buf, outpic_size, outpic);
    
    cout << "encoding frame " << i << "(size=" << out_size << ")\n";
    
    fwrite(outbuf, 1, out_size, file);
    

    
}
    

    
//encode delayed frames
    
for ( ; out_size; i++) 
    
{
    
    fflush(stdout);
    
    out_size = avcodec_encode_video(pCodecCtx, outbuf, outbuf_size, NULL);
    
    cout << "write frame " << i << "(size=" << out_size << ")\n";
    
    fwrite(outbuf, 1, out_size, file);
    
}
    

    
outbuf[0] = 0x00;
    
outbuf[1] = 0x00;
    
outbuf[2] = 0x01;
    
outbuf[3] = 0xb7;
    
fwrite(outbuf, 1, 4, file);
    

    
fclose(file);
    
delete outbuf;
    
avcodec_close(pCodecCtx);
    
av_free(pCodecCtx);
    
avpicture_free((AVPicture*)picture);
    
avpicture_free((AVPicture*)outpic);
    
delete picture_buf;
    
delete outpic_buf;

  • FFMPEG subtitle : mov_text removal

    27 mars 2014, par user3461178

    I have problems with subtitles. My video playout can not play them. So I have been trying to remove it.

    C:\Users\Jakub\Desktop\eclipse\workspace\tvpohoda_archiv>"c:\\lib/ffmpeg/bin/ffm
    
peg.exe" -i "videa/1050028-CITRON_-_Uz_zavrate_ridnou_c.m4v"  -sn -c:a copy -c:v
    
 copy  "videa/1050028-CITRON_-_Uz_zavrate_ridnou_c2.mov"
    
ffmpeg version N-57650-gcb52d6d Copyright (c) 2000-2013 the FFmpeg developers
    
  built on Oct 30 2013 20:35:46 with gcc 4.8.2 (GCC)
    
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
    
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
    
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
    
e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
    
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
    
ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
    
eex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aa
    
cenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavp
    
ack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
    
  libavutil      52. 48.100 / 52. 48.100
    
  libavcodec     55. 39.100 / 55. 39.100
    
  libavformat    55. 19.104 / 55. 19.104
    
  libavdevice    55.  5.100 / 55.  5.100
    
  libavfilter     3. 90.100 /  3. 90.100
    
  libswscale      2.  5.101 /  2.  5.101
    
  libswresample   0. 17.104 /  0. 17.104
    
  libpostproc    52.  3.100 / 52.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'videa/1050028-CITRON_-_Uz_zavrate_ridno
    
u_c.m4v':
    
  Metadata:
    
    major_brand     : M4V
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1
    
    encoder         : Lavf55.19.104
    
  Duration: 00:04:56.49, start: 0.021333, bitrate: 7239 kb/s
    
    Chapter #0.0: start 0.000000, end 296.400000
    
    Metadata:
    
      title           : Chapter 1
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x576 [
    
SAR 212:225 DAR 53:45], 6997 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 24
    
0 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
    Stream #0:2(eng): Subtitle: mov_text (text / 0x74786574)
    
    Metadata:
    
      handler_name    : SubtitleHandler
    
File 'videa/1050028-CITRON_-_Uz_zavrate_ridnou_c2.mov' already exists. Overwrite
    
 ? [y/N] y
    
Output #0, mov, to 'videa/1050028-CITRON_-_Uz_zavrate_ridnou_c2.mov':
    
  Metadata:
    
    major_brand     : M4V
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1
    
    encoder         : Lavf55.19.104
    
    Chapter #0.0: start 0.021000, end 296.421000
    
    Metadata:
    
      title           : Chapter 1
    
    Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p, 720x576 [SAR 212
    
:225 DAR 53:45], q=2-31, 6997 kb/s, 25 fps, 12800 tbn, 12800 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, 240 kb/s
    
 (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
  Stream #0:1 -> #0:1 (copy)
    
Press [q] to stop, [?] for help
    
frame= 7408 fps=0.0 q=-1.0 Lsize=  262031kB time=00:04:56.49 bitrate=7239.9kbits
    
/s
    
video:253116kB audio:8700kB subtitle:0 global headers:0kB muxing overhead 0.0820
    
40%

    Or :

    C:\Users\Jakub\Desktop\eclipse\workspace\tvpohoda_archiv>"c:\\lib/ffmpeg/bin/ffm
    
peg.exe" -i "videa/1050028-CITRON_-_Uz_zavrate_ridnou_c.m4v"  -map 0:0 -map 0:1
    
-c:a copy -c:v copy  "videa/1050028-CITRON_-_Uz_zavrate_ridnou_c2.mov"
    
ffmpeg version N-57650-gcb52d6d Copyright (c) 2000-2013 the FFmpeg developers
    
  built on Oct 30 2013 20:35:46 with gcc 4.8.2 (GCC)
    
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
    
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
    
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
    
e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
    
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
    
ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
    
eex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aa
    
cenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavp
    
ack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
    
  libavutil      52. 48.100 / 52. 48.100
    
  libavcodec     55. 39.100 / 55. 39.100
    
  libavformat    55. 19.104 / 55. 19.104
    
  libavdevice    55.  5.100 / 55.  5.100
    
  libavfilter     3. 90.100 /  3. 90.100
    
  libswscale      2.  5.101 /  2.  5.101
    
  libswresample   0. 17.104 /  0. 17.104
    
  libpostproc    52.  3.100 / 52.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'videa/1050028-CITRON_-_Uz_zavrate_ridno
    
u_c.m4v':
    
  Metadata:
    
    major_brand     : M4V
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1
    
    encoder         : Lavf55.19.104
    
  Duration: 00:04:56.49, start: 0.021333, bitrate: 7239 kb/s
    
    Chapter #0.0: start 0.000000, end 296.400000
    
    Metadata:
    
      title           : Chapter 1
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x576 [
    
SAR 212:225 DAR 53:45], 6997 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 24
    
0 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
    Stream #0:2(eng): Subtitle: mov_text (text / 0x74786574)
    
    Metadata:
    
      handler_name    : SubtitleHandler
    
Output #0, mov, to 'videa/1050028-CITRON_-_Uz_zavrate_ridnou_c2.mov':
    
  Metadata:
    
    major_brand     : M4V
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1
    
    encoder         : Lavf55.19.104
    
    Chapter #0.0: start 0.021000, end 296.421000
    
    Metadata:
    
      title           : Chapter 1
    
    Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p, 720x576 [SAR 212
    
:225 DAR 53:45], q=2-31, 6997 kb/s, 25 fps, 12800 tbn, 12800 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, 240 kb/s
    
 (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
  Stream #0:1 -> #0:1 (copy)
    
Press [q] to stop, [?] for help
    
frame= 2702 fps=0.0 q=-1.0 size=   95498kB time=00:01:48.03 bitrate=7241.6kbits/
    
frame= 4436 fps=4435 q=-1.0 size=  157319kB time=00:02:57.38 bitrate=7265.2kbits
    
frame= 6296 fps=4196 q=-1.0 size=  223194kB time=00:04:11.77 bitrate=7262.0kbits
    
frame= 7408 fps=4121 q=-1.0 Lsize=  262031kB time=00:04:56.49 bitrate=7239.9kbit
    
s/s
    
video:253116kB audio:8700kB subtitle:0 global headers:0kB muxing overhead 0.0820
    
40%

    But it did not worked, subtitles have stayed there.

    i am normally starting this ffmpeg from java but this files are from command line

    Please can you help me ?

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