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• Ffmpeg gdigrab records black window when capturing graphics-intensive flight simulator

  23 mars 2021, par iter

  I am trying to capture video from XPlane, a popular flight simulator. I'm running on Windows.

  



  Normally, I can capture individual windows using gdigrab, but when I use it on an XPlane window like so...

  



  ffmpeg -f gdigrab -framerate 30 -i "X-System" -b:v 300K capture.mp4


  



  ...I get a video file that's the right dimensions but is all black. I imagine this may have something to do with how XPlane talks directly to the GPU. I should add that if I capture the entire desktop like so...

  



  ffmpeg -f gdigrab -framerate 30 -i desktop -b:v 300K capture.mp4


  



  ...I get everything including the simulator window, but naturally with unrelated windows in the capture, including windows sitting on top of the simulator window.

  



  Is there a way for gdigrab to capture video this GPU-intensive window alone ? Is there a different tool I can use ?

  


• Every 27 seconds immediately appear around 3 seconds black

  23 juin 2018, par Monso

  I want every 27 seconds. appears a black space of 3 seconds and it repeats to the end. Example 0:27 0:54 1:21 until the end of the video .... here are 2 code I used but the second code does not work. The 1st code it automatically blurs the population, I want it not to fade itself. that i want it immediately black
  .please help me finish it

   Code 1
  
         ffmpeg -i input.mp4 -loop 1 -i logo.png -filter_complex "[1]trim=0:24,fade=in:st=0:d=1:alpha=1,fade=out:st=4:d=1:alpha=1,loop=999:750:0,setpts=N/25/TB[w];[0][w]overlay=shortest=1" output.mp4
  
  
  
   Code 2
  
         ffmpeg -i input.mp4 -vf "select='lt(mod(t,30),27)',setpts=N/FRAME_RATE/TB" output.mp4

• Suppress black margins on the sides of an animation

  26 avril 2018, par Clinton Winant

  I need to make an animation out of a collection of jpeg images. The image size, as given by display, is 1200x900. I can control the size of the jpg images with convert, but not sure what a good size would be. I use the following ffmpeg call :

  ffmpeg -f image2 -i img%04d.jpg -r 24  sound.avi

  In spite of a long string of warnings like

  Past duration 0.879997 too large

  sound.avi is produced, however the animation includes black right and left margins (see attached screen shot of the first frame)

  

  that I need to suppress. I am under the impression that the 4x3 format of the jpg images is standard ? I view the animation with

  mplayer sound.avi

  The OS is Debian buster

  Further experiments suggest that the black margins disappear if the jpg files have an aspect ratio 16:9. Is that the only AR possible ?

  The output of

  ffmpeg -f image2 -i img%04d.jpg -vf cropdetect -vframes 5 -f null

  requested by @Gyan is

  ffmpeg version 3.4.2-2 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7 (Debian 7.3.0-15)
  
    configuration: --prefix=/usr --extra-version=2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --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-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libavresample   3.  7.  0 /  3.  7.  0
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  Trailing options were found on the commandline.
  
  Input #0, image2, from 'img%04d.jpg':
  
    Duration: 00:00:00.40, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1200x900 [SAR 150:150 DAR 4:3], 25 fps, 25 tbr, 25 tbn, 25 tbc