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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
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    5 septembre 2013, par

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    21 juin 2013, par

    Présentez les changements dans votre MédiaSPIP ou les actualités de vos projets sur votre MédiaSPIP grâce à la rubrique actualités.
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  • How to extract 16-bit PNG frame from lossless x264 video

    29 mai 2017, par whiskeyspider

    I encoded a series of 16-bit grayscale PNGs to a lossless video with the following command :

    ffmpeg -i image%04d.png -crf 0 -c:v libx264 -preset veryslow output.mp4

    I am now trying to verify that the conversion to video was truly lossless by pulling out the PNGs at the same quality. The command I’m using :

    ffmpeg -i output.mp4 image%04d.png

    However, this is outputting 8-bit PNGs. I’ve tried various options I’ve read about such as -vcodec png and -qscale 0 but so far nothing appears to make it output 16-bit PNGs.

    How do I extract all frames from the video at the same quality as they were going in ? Or did I make a mistake in creating the lossless video in the first place ?

    Edit : I get this error message when trying to use -pix_fmt gray16be.

    [swscaler @ 0x7fef1a8f0800] deprecated pixel format used, make sure
    you did set range correctly

    Full output :

    ffmpeg -i output.mp4 -pix_fmt gray16be  image%04d.png
    
ffmpeg version 3.3.1 Copyright (c) 2000-2017 the FFmpeg developers
    
  built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.3.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
    
  libavutil      55. 58.100 / 55. 58.100
    
  libavcodec     57. 89.100 / 57. 89.100
    
  libavformat    57. 71.100 / 57. 71.100
    
  libavdevice    57.  6.100 / 57.  6.100
    
  libavfilter     6. 82.100 /  6. 82.100
    
  libavresample   3.  5.  0 /  3.  5.  0
    
  libswscale      4.  6.100 /  4.  6.100
    
  libswresample   2.  7.100 /  2.  7.100
    
  libpostproc    54.  5.100 / 54.  5.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf57.71.100
    
  Duration: 00:00:09.76, start: 0.000000, bitrate: 1337 kb/s
    
    Stream #0:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuvj444p(pc), 512x512, 1336 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 (native) -> png (native))
    
Press [q] to stop, [?] for help
    
[swscaler @ 0x7fef1a8f0800] deprecated pixel format used, make sure you did set range correctly
    
Output #0, image2, to 'image%04d.png':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf57.71.100
    
    Stream #0:0(und): Video: png, gray16be, 512x512, q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
      encoder         : Lavc57.89.100 png
    
frame=  244 fps=0.0 q=-0.0 Lsize=N/A time=00:00:09.76 bitrate=N/A speed=  21x    
    
video:4038kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

    I’m happy to use a non-ffmpeg solution if there is one.

  • How to extract 16-bit PNG frame from lossless x264 video

    29 mai 2017, par whiskeyspider

    I encoded a series of 16-bit grayscale PNGs to a lossless video with the following command :

    ffmpeg -i image%04d.png -crf 0 -c:v libx264 -preset veryslow output.mp4

    I am now trying to verify that the conversion to video was truly lossless by pulling out the PNGs at the same quality. The command I’m using :

    ffmpeg -i output.mp4 image%04d.png

    However, this is outputting 8-bit PNGs. I’ve tried various options I’ve read about such as -vcodec png and -qscale 0 but so far nothing appears to make it output 16-bit PNGs.

    How do I extract all frames from the video at the same quality as they were going in ? Or did I make a mistake in creating the lossless video in the first place ?

    Edit : I get this error message when trying to use -pix_fmt gray16be.

    [swscaler @ 0x7fef1a8f0800] deprecated pixel format used, make sure
    you did set range correctly

    Full output :

    ffmpeg -i output.mp4 -pix_fmt gray16be  image%04d.png
    
ffmpeg version 3.3.1 Copyright (c) 2000-2017 the FFmpeg developers
    
  built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
    
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.3.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda
    
  libavutil      55. 58.100 / 55. 58.100
    
  libavcodec     57. 89.100 / 57. 89.100
    
  libavformat    57. 71.100 / 57. 71.100
    
  libavdevice    57.  6.100 / 57.  6.100
    
  libavfilter     6. 82.100 /  6. 82.100
    
  libavresample   3.  5.  0 /  3.  5.  0
    
  libswscale      4.  6.100 /  4.  6.100
    
  libswresample   2.  7.100 /  2.  7.100
    
  libpostproc    54.  5.100 / 54.  5.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf57.71.100
    
  Duration: 00:00:09.76, start: 0.000000, bitrate: 1337 kb/s
    
    Stream #0:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuvj444p(pc), 512x512, 1336 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 (native) -> png (native))
    
Press [q] to stop, [?] for help
    
[swscaler @ 0x7fef1a8f0800] deprecated pixel format used, make sure you did set range correctly
    
Output #0, image2, to 'image%04d.png':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf57.71.100
    
    Stream #0:0(und): Video: png, gray16be, 512x512, q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
      encoder         : Lavc57.89.100 png
    
frame=  244 fps=0.0 q=-0.0 Lsize=N/A time=00:00:09.76 bitrate=N/A speed=  21x    
    
video:4038kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

    I’m happy to use a non-ffmpeg solution if there is one.

  • Increase Duration of a video FFMPEG C++

    9 avril 2015, par Shahroz Tariq

    I am using the code from the samples of FFmpeg which encodes a picture into a video. All I want to do is to give it a series of pictures and it gives me a video with each picture is taking one second`Code below is just taking one picture from my file system & creating video from it

    AVCodec *codec;
    
AVCodecContext *c = NULL;
    
int i, ret, x, y, got_output;
    
FILE *f;
    

    
AVPacket pkt;
    
uint8_t endcode[] = { 0, 0, 1, 0xb7 };
    

    
printf("Encode video file %s\n", filename);
    

    
/* find the mpeg1 video encoder */
    
codec = avcodec_find_encoder((AVCodecID)codec_id);
    
if (!codec)
    
{
    
    fprintf(stderr, "Codec not found\n");
    
    exit(1);
    
}
    

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

    
/* put sample parameters */
    
c->bit_rate = 400000;
    
/* resolution must be a multiple of two */
    
c->width = 200;
    
c->height = 200;
    
/* frames per second */
    
AVRational rational;
    
rational.num = 1;
    
rational.den = 25;
    
c->time_base = rational;
    
/* emit one intra frame every ten frames
    
* check frame pict_type before passing frame
    
* to encoder, if frame->pict_type is AV_PICTURE_TYPE_I
    
* then gop_size is ignored and the output of encoder
    
* will always be I frame irrespective to gop_size
    
*/
    
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 it */
    
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);
    
}
    
AVFrame *frame = OpenImage("..\\..\\..\\..\\..\\..\\1.jpg");
    
//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;
    
/* the image can be allocated by any means and av_image_alloc() is
    
* just the most convenient way if av_malloc() is to be used */
    

    
int screenHeight = 200;
    
int screenWidth = 200;
    
for (i = 0; i < 25; i++)
    
{
    
    av_init_packet(&pkt);
    
    pkt.data = NULL;    // packet data will be allocated by the encoder
    
    pkt.size = 0;
    

    
    fflush(stdout);
    

    

    

    
    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("Write frame %3d (size=%5d)\n", i, pkt.size);
    
        fwrite(pkt.data, 1, pkt.size, f);
    
        av_free_packet(&pkt);
    
    }
    
}
    

    
/* get the delayed frames */
    
for (got_output = 1; got_output; i++)
    
{
    
    fflush(stdout);
    

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

    
    if (got_output)
    
    {
    
        printf("Write frame %3d (size=%5d)\n", i, pkt.size);
    
        fwrite(pkt.data, 1, pkt.size, f);
    
        av_free_packet(&pkt);
    
    }
    
}
    

    
/* add sequence end code to have a real mpeg file */
    
fwrite(endcode, 1, sizeof(endcode), f);
    
fclose(f);
    

    
avcodec_close(c);
    
av_free(c);
    
av_freep(&frame->data[0]);
    
av_frame_free(&frame);
    
printf("\n");`

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