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• needed list of steps to make desktop as video streaming server using ffmpeg

  29 mai 2018, par vijayky88

  I am trying to run my Ubuntu machine as ffmpeg server. where i wanted to stream my local video over http.

  please suggest the list of complete commands and steps as well.

  Thanks in advance !

• avdevice/xcbgrab : don't assume xserver endianness

  31 janvier 2021, par Andriy Gelman

  avdevice/xcbgrab : don't assume xserver endianness
  xserver defines the endianness of the grabbed images. Use this information
  
  to set the correct pixel format.
  This also fixes format selection in configuration depth=32/bpp=32 with
  
  xserver on a little endian machine. Before the patch, the big endian
  
  layout 0RGB was always selected which is incorrect because BGR0 should
  
  be used. RGB24 was also incorrectly assumed (but this format was removed
  
  in xserver 1.20).
  The big-endian settings can be tested using docker+qemu from a little-endian
  
  machine :
  $ docker run —rm —privileged multiarch/qemu-user-static —reset -p yes
  
  $ docker run —rm -it -v /tmp :/tmp powerpc64/debian /bin/bash
  In docker container
  
  $ apt-get update
  
  $ apt-get install xvfb
  
  $ apt-get install x11-apps
  To test AV_PIX_FMT_0RGB32
  
  $ Xvfb :2 -screen 0 720x480x24 &
  
  $ export DISPLAY=:2
  
  $ xclock -geometry 720x480 -bg green #test different colors
  On your host machine grab the frames using the following
  
  command. View output to check that colors are rendered correctly
  
  $ ./ffmpeg -y -f x11grab -i :2.0 -codec:v mpeg2video out.mp4
  Other pixel formats can be tested by modifying how Xvfb is started in the docker
  
  container :
  AV_PIX_FMT_RGB565
  
  $ Xvfb :2 -screen 0 720x480x16
  AV_PIX_FMT_RGB555
  
  $ Xvfb :2 -screen 0 720x480x15
  AV_PIX_FMT_BGR24 / AV_PIX_FMT_RGB24
  
  This is difficult to test because bpp=24 support was removed in xserver 1.20
  
  https://lists.x.org/archives/xorg-devel/2018-February/056175.html?hmsr=joyk.com&utm_source=joyk.com&utm_medium=referral
  
  However, I was able to run previous version of Xvfb (with some
  
  modifications to force 24bpp) to check that images are rendered correctly.
  Reviewed-by : Carl Eugen Hoyos <ceffmpeg@gmail.com>
  
  Signed-off-by : Andriy Gelman <andriy.gelman@gmail.com>
  

  • [DH] libavdevice/xcbgrab.c

• Screen capture in CircleCI VMs in macOS [closed]

  16 août 2024, par Anton Shkurenko

  I'm trying to record test videos using either ffmpeg or appium mac2 driver (as far as I know, it uses ffmpeg behind the scenes anyway)

  


  deviceId == 0 is screen capture in CircleCI VM.

  


  In python code is simple :

  


  appium_driver.start_recording_screen(deviceId=0)

  


  Or using raw ffmpeg :

  


  ffmpeg -f avfoundation -i "0" -t 10 output.mp4

  


  But I can't give permissions somehow. Once I start video recording, there is a popup :

  


  

  


  And an error :

  


  [ffmpeg] objc[23088]: class 'NSKVONotifying_AVCaptureScreenInput' not linked into application

  


  What I've tried :

  


  basically main are ffmpeg and .machine-agent, others are just out of desperation 🙂

  


        - macos/add-permission:
         bundle-id: /Applications/Utilities/Terminal.app
         permission-type: kTCCServiceScreenCapture
     - macos/add-permission:
         bundle-id: /private/tmp/.machine-agent
         permission-type: kTCCServiceScreenCapture
     - macos/add-permission:
         bundle-id: /usr/local/bin/ffmpeg
         permission-type: kTCCServiceScreenCapture
     - macos/add-permission:
         bundle-id: /opt/homebrew/bin/appium
         permission-type: kTCCServiceScreenCapture


  


  P.S.
Screen capturing via applescript and quicktime doesn't work for me (I can't click "Record" button). What I've also tried : wrap ffmpeg into apple Automator or Apple Script to make a fake app and give permissions to it, but it didn't work neither.