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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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