Recherche avancée

Sur d’autres sites (515)

• FFmpeg gdigrab failed to capture image

  1er février 2023, par Marek Spišiak

  Hi I am trying to capture desktop with ffmpeg gdigrab. I am using SSH connection to remotely use admin cmd on windows 10 pc. When i execute this command normally it works but remotely it doesnt.

  


  ffmpeg -f gdigrab -framerate 30 -i desktop output.mkv

  


  error message

  


  ffmpeg version 4.4-essentials_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.0 (Rev6, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
[gdigrab @ 000001f3e781e600] Capturing whole desktop as 1024x768x32 at (0,0)
[gdigrab @ 000001f3e781e600] Failed to capture image (error 5)
[gdigrab @ 000001f3e781e600] Could not find codec parameters for stream 0 (Video: bmp, none, 754987 kb/s): unspecified size
Consider increasing the value for the 'analyzeduration' (15000000) and 'probesize' (70000000) options
Input #0, gdigrab, from 'desktop':
  Duration: N/A, bitrate: 754987 kb/s
  Stream #0:0: Video: bmp, none, 754987 kb/s, 30 fps, 1000k tbr, 1000k tbn, 1000k tbc
Output #0, matroska, to 'pipe:':
Output file #0 does not contain any stream


  


  I tried to increase analyzeduration and probesize to max integer but it doesnt help.

  


• FFMPEG - gdigrab startup delay with nodejs child_process

  7 août 2022, par Tair Cohen

  I am using the following command for screen recording :

  


  ffmpeg -rtbufsize 100M -f gdigrab -framerate 5 -probesize 10M -draw_mouse 1 -show_region 0 -i desktop -y -c:v libx264 -r 5 -tune zerolatency -g 75 -crf 35 -pix_fmt yuv420p -map 0 -segment_time 60 -f segment -segment_format mp4 -vf pad=ceil(iw/2)*2:ceil(ih/2)*2 C :\Users\tairc\AppData\Roaming\ScreenAgent\recordings\fdfe10c0-9bb2-47d4-bfc1-ebee8b1f6e18\1659869590658_%03d.mp4

  


  This is the code where I spawn the FFmpeg command :

  


   _spawnFfmpeg() {
    let commandArgs = this._generateArgs();
    this.ffmpegProcess = child_process.spawn(process.env.FFMPEG_PATH, commandArgs);
    console.log("after spawn"); // A

    this.ffmpegProcess.stderr.setEncoding('utf8');

    this.ffmpegProcess.on('error', (err => {
        return this.emit('error', err);
    }));

    this.ffmpegProcess.stderr.once('data', () => {
        console.log("first data"); // B
        return this.emit('start', `ffmpeg ${commandArgs.join(' ')}`);
    });

    this.ffmpegProcess.stderr.on('data', data => {
        return this.emit('stderr', data);
    });
}


  


  I have a startup delay of 8 seconds (delay between A to B).

  


  Can anyone please assist with improving the command ?

  


• FFMPEG screen recording by gdigrab "can't find input device." on Windows 10

  7 juillet 2021, par Mateusz Bugaj

  I need to implement screen recording in my software but I have a problem with getting gdigrab in windows 10. This code return

  


  


  "can't find input device." (av_find_input_format("gdigrab") return NULL).

  


  


  If I try to record desktop by ffmpeg.exe using ffmpeg -f gdigrab -i desktop out.avi, the desktop is recording correctly.

  


  #define _CRT_SECURE_NO_WARNINGS
#include 

extern "C"
{
#include "ffmpeg-x86-4.4/include/libavcodec/avcodec.h" 
#include "ffmpeg-x86-4.4/include/libavformat/avformat.h"
#include "ffmpeg-x86-4.4/include/libswscale/swscale.h"
#include "ffmpeg-x86-4.4/include/libavdevice/avdevice.h"
#include "ffmpeg-x86-4.4/include/libavutil/imgutils.h"
#include "ffmpeg-x86-4.4/include/libavutil/dict.h"
#include "SDL2/include/SDL.h"
}


#define OUTPUT_YUV420P 1
#define OUTPUT_H264 1

int main(int argc, char* argv[])
{
    AVFormatContext* pFormatCtx;
    AVStream* videoStream;
    AVCodecContext* pCodecCtx;
    AVCodec* pCodec;
    AVFrame* pFrame, * pFrameYUV;
    AVPacket* pPacket;
    SwsContext* pImgConvertCtx;

    int videoIndex = -1;
    unsigned int i = 0;

    SDL_Window* screen;
    SDL_Renderer* sdlRenderer;
    SDL_Texture* sdlTexture;
    SDL_Rect sdlRect;

    int screen_w = 0;
    int screen_h = 0;

    printf("Starting...\n");



    //AVInputFormat* p = NULL;

    //register device
    avdevice_register_all();
    
    //use gdigrab
    AVInputFormat* ifmt = av_find_input_format("gdigrab");

    if (!ifmt)
    {
        printf("can't find input device.\n");
        return -1;
    }

    AVDictionary* options = NULL;
    if (avformat_open_input(&pFormatCtx, "desktop", ifmt, &options) != 0)
    {
        printf("can't open input stream.\n");
        return -1;
    }

    if (avformat_find_stream_info(pFormatCtx, NULL) < 0)
    {
        printf("can't find stream information.\n");
        return -1;
    }