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    13 juin 2013

    Puis-je poster des contenus à partir d’une tablette Ipad ?
    Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir

  • XMP PHP

    13 mai 2011, par

    Dixit Wikipedia, XMP signifie :
    Extensible Metadata Platform ou XMP est un format de métadonnées basé sur XML utilisé dans les applications PDF, de photographie et de graphisme. Il a été lancé par Adobe Systems en avril 2001 en étant intégré à la version 5.0 d’Adobe Acrobat.
    Étant basé sur XML, il gère un ensemble de tags dynamiques pour l’utilisation dans le cadre du Web sémantique.
    XMP permet d’enregistrer sous forme d’un document XML des informations relatives à un fichier : titre, auteur, historique (...)

  • À propos des documents

    21 juin 2013, par

    Que faire quand un document ne passe pas en traitement, dont le rendu ne correspond pas aux attentes ?
    Document bloqué en file d’attente ?
    Voici une liste d’actions ordonnée et empirique possible pour tenter de débloquer la situation : Relancer le traitement du document qui ne passe pas Retenter l’insertion du document sur le site MédiaSPIP Dans le cas d’un média de type video ou audio, retravailler le média produit à l’aide d’un éditeur ou un transcodeur. Convertir le document dans un format (...)

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  • Need help using libavfilter for adding overlay to frames [closed]

    30 juillet 2024, par Michael Werner

    Hello gentlemen and ladies,

    


    I am working with libavfilter and I am getting crazy.

    


    On Windows 11 OS with latest libav (full build) a C/C++ app reads YUV420P frames from a frame grabber card.

    


    I want to draw a bitmap (BGR24) overlay image from file on every frame via libavfilter. First I convert the BGR24 overlay image via format filter to YUV420P. Then I feed the YUV420P frame from frame grabber and the YUV420P overlay into the overlay filter.

    


    Everything seems to be fine but when I try to get the frame out of the filter graph I always get an "Resource is temporary not available" (EAGAIN) return code, independent on how many frames I put into the graph.

    


    The frames from the frame grabber card are fine, I could encode them or write them to a .yuv file. The overlay frame looks fine too.

    


    My current initialization code looks like below. It does not report any errors or warnings but when I try to get the filtered frame out of the graph via av_buffersink_get_frame I always get an EAGAIN return code.

    


    Here is my current initialization code :

    


    int init_overlay_filter(AVFilterGraph** graph, AVFilterContext** src_ctx, AVFilterContext** overlay_src_ctx,
                        AVFilterContext** sink_ctx)
{
    AVFilterGraph* filter_graph;
    AVFilterContext* buffersrc_ctx;
    AVFilterContext* overlay_buffersrc_ctx;
    AVFilterContext* buffersink_ctx;
    AVFilterContext* overlay_ctx;
    AVFilterContext* format_ctx;
    const AVFilter *buffersrc, *buffersink, *overlay_buffersrc, *overlay_filter, *format_filter;
    int ret;

    // Create the filter graph
    filter_graph = avfilter_graph_alloc();
    if (!filter_graph)
    {
        fprintf(stderr, "Unable to create filter graph.\n");
        return AVERROR(ENOMEM);
    }

    // Create buffer source filter for main video
    buffersrc = avfilter_get_by_name("buffer");
    if (!buffersrc)
    {
        fprintf(stderr, "Unable to find buffer filter.\n");
        return AVERROR_FILTER_NOT_FOUND;
    }

    // Create buffer source filter for overlay image
    overlay_buffersrc = avfilter_get_by_name("buffer");
    if (!overlay_buffersrc)
    {
        fprintf(stderr, "Unable to find buffer filter.\n");
        return AVERROR_FILTER_NOT_FOUND;
    }

    // Create buffer sink filter
    buffersink = avfilter_get_by_name("buffersink");
    if (!buffersink)
    {
        fprintf(stderr, "Unable to find buffersink filter.\n");
        return AVERROR_FILTER_NOT_FOUND;
    }

    // Create overlay filter
    overlay_filter = avfilter_get_by_name("overlay");
    if (!overlay_filter)
    {
        fprintf(stderr, "Unable to find overlay filter.\n");
        return AVERROR_FILTER_NOT_FOUND;
    }

    // Create format filter
    format_filter = avfilter_get_by_name("format");
    if (!format_filter) 
    {
        fprintf(stderr, "Unable to find format filter.\n");
        return AVERROR_FILTER_NOT_FOUND;
    }

    // Initialize the main video buffer source
    char args[512];
    snprintf(args, sizeof(args),
             "video_size=1920x1080:pix_fmt=yuv420p:time_base=1/25:pixel_aspect=1/1");
    ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in", args, NULL, filter_graph);
    if (ret < 0)
    {
        fprintf(stderr, "Unable to create buffer source filter for main video.\n");
        return ret;
    }

    // Initialize the overlay buffer source
    snprintf(args, sizeof(args),
             "video_size=165x165:pix_fmt=bgr24:time_base=1/25:pixel_aspect=1/1");
    ret = avfilter_graph_create_filter(&overlay_buffersrc_ctx, overlay_buffersrc, "overlay_in", args, NULL,
                                       filter_graph);
    if (ret < 0)
    {
        fprintf(stderr, "Unable to create buffer source filter for overlay.\n");
        return ret;
    }

    // Initialize the format filter to convert overlay image to yuv420p
    snprintf(args, sizeof(args), "pix_fmts=yuv420p");
    ret = avfilter_graph_create_filter(&format_ctx, format_filter, "format", args, NULL, filter_graph);

    if (ret < 0) 
    {
        fprintf(stderr, "Unable to create format filter.\n");
        return ret;
    }

    // Initialize the buffer sink
    ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out", NULL, NULL, filter_graph);
    if (ret < 0)
    {
        fprintf(stderr, "Unable to create buffer sink filter.\n");
        return ret;
    }

    // Initialize the overlay filter
    ret = avfilter_graph_create_filter(&overlay_ctx, overlay_filter, "overlay", "W-w:H-h:enable='between(t,0,20)':format=yuv420", NULL, filter_graph);
    if (ret < 0)
    {
        fprintf(stderr, "Unable to create overlay filter.\n");
        return ret;
    }

    // Connect the filters
    ret = avfilter_link(overlay_buffersrc_ctx, 0, format_ctx, 0);

    if (ret >= 0)
    {
        ret = avfilter_link(buffersrc_ctx, 0, overlay_ctx, 0);
    }
    else
    {
        fprintf(stderr, "Unable to configure filter graph.\n");
        return ret;
    }


    if (ret >= 0) 
    {
        ret = avfilter_link(format_ctx, 0, overlay_ctx, 1);
    }
    else
    {
        fprintf(stderr, "Unable to configure filter graph.\n");
        return ret;
    }

    if (ret >= 0) 
    {
        if ((ret = avfilter_link(overlay_ctx, 0, buffersink_ctx, 0)) < 0)
        {
            fprintf(stderr, "Unable to link filter graph.\n");
            return ret;
        }
    }
    else
    {
        fprintf(stderr, "Unable to configure filter graph.\n");
        return ret;
    }

    // Configure the filter graph
    if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0)
    {
        fprintf(stderr, "Unable to configure filter graph.\n");
        return ret;
    }

    *graph = filter_graph;
    *src_ctx = buffersrc_ctx;
    *overlay_src_ctx = overlay_buffersrc_ctx;
    *sink_ctx = buffersink_ctx;

    return 0;
}


    


    Feeding the filter graph is done this way :

    


    av_buffersrc_add_frame_flags(buffersrc_ctx, pFrameGrabberFrame, AV_BUFFERSRC_FLAG_KEEP_REF)
av_buffersink_get_frame(buffersink_ctx, filtered_frame)


    


    av_buffersink_get_frame returns always EAGAIN, no matter how many frames I feed into the graph. The frames (from framegrabber and the overlay frame) itself are looking fine.

    


    I did set libav logging level to maximum but I do not see any warnings or errors or helpful, related information in the log.

    


    Here the log output related to the filter configuration :

    


    [in @ 00000288ee494f40] Setting 'video_size' to value '1920x1080'
[in @ 00000288ee494f40] Setting 'pix_fmt' to value 'yuv420p'
[in @ 00000288ee494f40] Setting 'time_base' to value '1/25'
[in @ 00000288ee494f40] Setting 'pixel_aspect' to value '1/1'
[in @ 00000288ee494f40] w:1920 h:1080 pixfmt:yuv420p tb:1/25 fr:0/1 sar:1/1 csp:unknown range:unknown
[overlay_in @ 00000288ff1013c0] Setting 'video_size' to value '165x165'
[overlay_in @ 00000288ff1013c0] Setting 'pix_fmt' to value 'bgr24'
[overlay_in @ 00000288ff1013c0] Setting 'time_base' to value '1/25'
[overlay_in @ 00000288ff1013c0] Setting 'pixel_aspect' to value '1/1'
[overlay_in @ 00000288ff1013c0] w:165 h:165 pixfmt:bgr24 tb:1/25 fr:0/1 sar:1/1 csp:unknown range:unknown
[format @ 00000288ff1015c0] Setting 'pix_fmts' to value 'yuv420p'
[overlay @ 00000288ff101880] Setting 'x' to value 'W-w'
[overlay @ 00000288ff101880] Setting 'y' to value 'H-h'
[overlay @ 00000288ff101880] Setting 'enable' to value 'between(t,0,20)'
[overlay @ 00000288ff101880] Setting 'format' to value 'yuv420'
[auto_scale_0 @ 00000288ff101ec0] w:iw h:ih flags:'' interl:0
[format @ 00000288ff1015c0] auto-inserting filter 'auto_scale_0' between the filter 'overlay_in' and the filter 'format'
[auto_scale_1 @ 00000288ee4a4cc0] w:iw h:ih flags:'' interl:0
[overlay @ 00000288ff101880] auto-inserting filter 'auto_scale_1' between the filter 'format' and the filter 'overlay'
[AVFilterGraph @ 00000288ee495c80] query_formats: 5 queried, 6 merged, 6 already done, 0 delayed
[auto_scale_0 @ 00000288ff101ec0] w:165 h:165 fmt:bgr24 csp:gbr range:pc sar:1/1 -> w:165 h:165 fmt:yuv420p csp:unknown range:unknown sar:1/1 flags:0x00000004
[auto_scale_1 @ 00000288ee4a4cc0] w:165 h:165 fmt:yuv420p csp:unknown range:unknown sar:1/1 -> w:165 h:165 fmt:yuva420p csp:unknown range:unknown sar:1/1 flags:0x00000004
[overlay @ 00000288ff101880] main w:1920 h:1080 fmt:yuv420p overlay w:165 h:165 fmt:yuva420p
[overlay @ 00000288ff101880] [framesync @ 00000288ff1019a8] Selected 1/25 time base
[overlay @ 00000288ff101880] [framesync @ 00000288ff1019a8] Sync level 2


    


  • Motion : Raspian webcam Unable to find a compatible palette format

    25 juin 2018, par mrtumnus

    I am trying to get a Creative Live ! Motion webcam working on a Raspberry Pi 3 B+. fswebcam and motion both give an error, "Unable to find a compatible palette format". ffmpeg, on the other hand, is able to easily capture video from the webcam.

    Device info :

    $ lsusb
    
Bus 001 Device 004: ID 041e:4041 Creative Technology, Ltd Webcam Live! Motion`
    

    
$ v4l2-ctl --all
    
Driver Info (not using libv4l2):
    
    Driver name   : sq930x
    
    Card type     : Creative WebCam Live! Motion
    
    Bus info      : usb-3f980000.usb-1.2
    
    Driver version: 4.14.34
    
    Capabilities  : 0x85200001
    
            Video Capture
    
            Read/Write
    
            Streaming
    
            Extended Pix Format
    
            Device Capabilities
    
    Device Caps   : 0x05200001
    
            Video Capture
    
            Read/Write
    
            Streaming
    
            Extended Pix Format
    
Priority: 2
    
Video input : 0 (sq930x: ok)
    
Format Video Capture:
    
    Width/Height      : 640/480
    
    Pixel Format      : 'RGGB'
    
    Field             : None
    
    Bytes per Line    : 640
    
    Size Image        : 307200
    
    Colorspace        : sRGB
    
    Transfer Function : Default
    
    YCbCr/HSV Encoding: Default
    
    Quantization      : Default
    
    Flags             :
    
Streaming Parameters Video Capture:
    
    Frames per second: invalid (0/0)
    
    Read buffers     : 2
    

    
User Controls
    

    
                   exposure (int)    : min=1 max=4095 step=1 default=854 value=854
    
                       gain (int)    : min=1 max=255 step=1 default=141 value=141

    Log of motion failure to open device :

    $ cat /var/log/motion/motion.log
    
[0:motion] [NTC] [ALL] [Jun 24 16:16:42] motion_startup: Using log type (ALL) log level (NTC)
    
[0:motion] [NTC] [ENC] [Jun 24 16:16:42] ffmpeg_init: ffmpeg libavcodec version 57.48.101 libavformat version 57.41.100
    
[0:motion] [NTC] [ALL] [Jun 24 16:16:42] main: Motion running in setup mode.
    
[0:motion] [NTC] [ALL] [Jun 24 16:16:42] main: Camera 0 is from /etc/motion/motion.conf
    
[0:motion] [NTC] [ALL] [Jun 24 16:16:42] main: Camera 0 is device: /dev/video0 input -1
    
[0:motion] [NTC] [ALL] [Jun 24 16:16:42] main: Stream port 8081
    
[0:motion] [NTC] [ALL] [Jun 24 16:16:42] main: Waiting for threads to finish, pid: 12067
    
[0:web_control] [NTC] [STR] [Jun 24 16:16:42] http_bindsock: listening on 127.0.0.1 port 8080
    
[1:ml1] [NTC] [ALL] [Jun 24 16:16:42] motion_init: Camera 0 started: motion detection Enabled
    
[0:web_control] [NTC] [STR] [Jun 24 16:16:42] httpd_run: Started motion-httpd server on port 8080 (auth Disabled)
    
[1:ml1] [NTC] [VID] [Jun 24 16:16:42] vid_v4lx_start: Using videodevice /dev/video0 and input -1
    
[1:ml1] [NTC] [VID] [Jun 24 16:16:42] v4l2_get_capability:
    
------------------------
    
cap.driver: "sq930x"
    
cap.card: "Creative WebCam Live! Motion"
    
cap.bus_info: "usb-3f980000.usb-1.2"
    
cap.capabilities=0x85200001
    
------------------------
    
[1:ml1] [NTC] [VID] [Jun 24 16:16:42] v4l2_get_capability: - VIDEO_CAPTURE
    
[1:ml1] [NTC] [VID] [Jun 24 16:16:42] v4l2_get_capability: - READWRITE
    
[1:ml1] [NTC] [VID] [Jun 24 16:16:42] v4l2_get_capability: - STREAMING
    
[1:ml1] [NTC] [VID] [Jun 24 16:16:42] v4l2_select_input: name = "sq930x", type 0x00000002, status 00000000
    
[1:ml1] [NTC] [VID] [Jun 24 16:16:42] v4l2_select_input: - CAMERA
    
[1:ml1] [WRN] [VID] [Jun 24 16:16:42] v4l2_select_input: Device doesn't support VIDIOC_G_STD
    
[1:ml1] [NTC] [VID] [Jun 24 16:16:42] v4l2_set_pix_format: Config palette index 17 (YU12) doesn't work.
    
[1:ml1] [NTC] [VID] [Jun 24 16:16:42] v4l2_set_pix_format: Supported palettes:
    
[1:ml1] [NTC] [VID] [Jun 24 16:16:42] v4l2_set_pix_format: (0) RGGB (8-bit Bayer RGRG/GBGB)
    
[1:ml1] [NTC] [VID] [Jun 24 16:16:42] v4l2_set_pix_format: 0 - 8-bit Bayer RGRG/GBGB (compressed : 0) (0x42474752)
    
[1:ml1] [ERR] [VID] [Jun 24 16:16:42] v4l2_set_pix_format: Unable to find a compatible palette format.
    
[1:ml1] [NTC] [VID] [Jun 24 16:16:42] vid_v4lx_start: Using V4L1
    
[1:ml1] [NTC] [ALL] [Jun 24 16:16:42] image_ring_resize: Resizing pre_capture buffer to 1 items
    
[1:ml1] [ERR] [ALL] [Jun 24 16:16:52] motion_init: Error capturing first image
    
[1:ml1] [NTC] [STR] [Jun 24 16:16:52] http_bindsock: listening on 127.0.0.1 port 8081
    
[1:ml1] [NTC] [ALL] [Jun 24 16:16:52] motion_init: Started motion-stream server on port 8081 (auth Disabled)
    
[1:ml1] [ERR] [ALL] [Jun 24 16:16:52] motion_loop: Video device fatal error - Closing video device
    
[1:ml1] [NTC] [VID] [Jun 24 16:16:52] vid_close: Closing video device /dev/video0

    Successful ffmpeg recording :

    $ ffmpeg -i /dev/video0 test.mp4
    
ffmpeg version 3.2.10-1~deb9u1+rpt1 Copyright (c) 2000-2018 the FFmpeg developers
    
  built with gcc 6.3.0 (Raspbian 6.3.0-18+rpi1) 20170516
    
  configuration: --prefix=/usr --extra-version='1~deb9u1+rpt1' --toolchain=hardened --libdir=/usr/lib/arm-linux-gnueabihf --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libebur128 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --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-libxvid --enable-libzmq --enable-libzvbi --enable-omx-rpi --enable-mmal --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
    
  libavutil      55. 34.101 / 55. 34.101
    
  libavcodec     57. 64.101 / 57. 64.101
    
  libavformat    57. 56.101 / 57. 56.101
    
  libavdevice    57.  1.100 / 57.  1.100
    
  libavfilter     6. 65.100 /  6. 65.100
    
  libavresample   3.  1.  0 /  3.  1.  0
    
  libswscale      4.  2.100 /  4.  2.100
    
  libswresample   2.  3.100 /  2.  3.100
    
  libpostproc    54.  1.100 / 54.  1.100
    
[video4linux2,v4l2 @ 0x16035c0] Time per frame unknown
    
Input #0, video4linux2,v4l2, from '/dev/video0':
    
  Duration: N/A, start: 2523.746120, bitrate: N/A
    
    Stream #0:0: Video: rawvideo ([186]RG[8] / 0x84752BA), bayer_rggb8, 640x480, 25.42 tbr, 1000k tbn, 1000k tbc

    Related questions :

    Raspberry Pi webcam unable to open video device

    webcam Unable to find a compatible palette format

  • Web camera Logitech and Linux

    8 novembre 2019, par Nick Saw

    I have Logitech C310 camera with the declared characteristics of 720p 30fps.

    If you connect the camera to windows, the recording is fully consistent with the stated 720p 30fps - the picture is clear.

    The challenge is to connect the same camera to OrangePI (server Armbian) and to save video files on it.

    The camera appears as /dev/video0.

    sudo ffmpeg -f v4l2 -s 1280x720 -i /dev/video0 output.wmv

    As a result, I get a crumbly picture with a frequency of 5 fps.

    Maybe I’m using ffmpeg incorrectly ? Please help me who has experience with Web cameras on Linux ...
    Thanks in advance.

    USB-camera configuration :

    v4l2-ctl --all --device=/dev/video0
    

    

    
Driver Info (not using libv4l2):
    
        Driver name   : uvcvideo
    
        Card type     : UVC Camera (046d:081b)
    
        Bus info      : usb-1c1c000.usb-1
    
        Driver version: 4.14.18
    
        Capabilities  : 0x84200001
    
                Video Capture
    
                Streaming
    
                Extended Pix Format
    
                Device Capabilities
    
        Device Caps   : 0x04200001
    
                Video Capture
    
                Streaming
    
                Extended Pix Format
    
Priority: 2
    
Video input : 0 (Camera 1: ok)
    
Format Video Capture:
    
        Width/Height      : 1280/720
    
        Pixel Format      : 'YUYV'
    
        Field             : None
    
        Bytes per Line    : 2560
    
        Size Image        : 1843200
    
        Colorspace        : sRGB
    
        Transfer Function : Default
    
        YCbCr/HSV Encoding: Default
    
        Quantization      : Default
    
        Flags             :
    
Crop Capability Video Capture:
    
        Bounds      : Left 0, Top 0, Width 1280, Height 720
    
        Default     : Left 0, Top 0, Width 1280, Height 720
    
        Pixel Aspect: 1/1
    
Selection: crop_default, Left 0, Top 0, Width 1280, Height 720
    
Selection: crop_bounds, Left 0, Top 0, Width 1280, Height 720
    
Streaming Parameters Video Capture:
    
        Capabilities     : timeperframe
    
        Frames per second: 5.000 (5/1)
    
        Read buffers     : 0
    
                     brightness (int)    : min=0 max=255 step=1 default=128 value=128
    
                       contrast (int)    : min=0 max=255 step=1 default=32 value=32
    
                     saturation (int)    : min=0 max=255 step=1 default=32 value=32
    
 white_balance_temperature_auto (bool)   : default=1 value=1
    
                           gain (int)    : min=0 max=255 step=1 default=64 value=192
    
           power_line_frequency (menu)   : min=0 max=2 default=2 value=2
    
      white_balance_temperature (int)    : min=0 max=10000 step=10 default=4000 value=4610 flags=inactive
    
                      sharpness (int)    : min=0 max=255 step=1 default=24 value=24
    
         backlight_compensation (int)    : min=0 max=1 step=1 default=0 value=0
    
                  exposure_auto (menu)   : min=0 max=3 default=3 value=3
    
              exposure_absolute (int)    : min=1 max=10000 step=1 default=166 value=249 flags=inactive
    
         exposure_auto_priority (bool)   : default=0 value=1
    
                      led1_mode (menu)   : min=0 max=3 default=3 value=3
    
                 led1_frequency (int)    : min=0 max=131 step=1 default=0 value=0

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