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• ffmpeg capture single window screen freezes with only mouse working

  2 septembre 2015, par Saad Abdullah

  Scenario and Problem :
  I have two machines with windows 8.1 installed. On one computer, every thing works fine with video recording by using gdigrab to capture a window by title. But on the other pc, the desktop recording works fine, but when it comes to capture single window by title, the video freezes with only mouse working. (to be exact, if i play webcam or images in the window being captured, it records the content too, but when some video is played it starts showing black screen or freezed at first frame.

  Commandline :
  here is the commandline args

  ffmpeg -f gdigrab -framerate 30 -i title="Video - VLC media player" germ.flv

  What can be the issue on the other pc ?

• mobile-ffmpeg can't open gallery videos

  25 juillet 2020, par MoTahir

  I'm trying to practice video editing with ffmpeg, I made a sample app which allows the users to either record a video then edit it or choose a video from gallery to edit.

  


  When the user records videos with the application a temporary file is created then that file path is sent to ffmpeg to edit then save

  


  "-i $videoPath  -vf crop=ih/$screenR:ih $outPath"


  


  I'm just cropping the video then saving it as a test, The above command works as intended without any problems.

  


  When I try to edit videos from gallery it doesn't work, I understand that the storage system in new versions of android devices is different, the uri is just an address to the content not an actual path to the file

  


  the video path from gallery is something like this

  


  


  content ://media/external/file/38625

  


  


  ffmpeg can not access the video with that path so it can't edit it, what should I do ? thank you in advance.

  


• Realtime recording while listening for input

  28 octobre 2016, par Nyalmo

  I’m currently running a python 2.7 script, using two threads running concurrently. One thread consistently looking for input (raw_input at the moment) activating a global variable when it gets one. The other consistently records using bash ffmpeg commands with subprocess. When the global variable of the former thread is active the latter thread triggers an event.

  My problem is that while the second thread is recording video from a stream, I can’t input anything and the breaks between recordings are really short. So basically it keeps recording for 30 seconds and overwriting itself without allowing me to activate the variable to save the current file somewhere.

  I’ve tried to run the ffmpeg in subprocess in the background by using the & and by hiding it’s output but did not have much success there.

  Can anyone help me with this, preferably with a small example ?

  My basic recording thread currently :

  from subprocess import Popen
  
  Last30S_Command = (["ffmpeg", "-i", "rtsp://admin:12345@192.168.25.179:554/Streaming/Channels/1", "-r", "30", "-vcodec", "copy", "-an", "-t", "30", "-y", "/Path/Last30S.mp4"])
  
  
  
  subprocess.call(Last30S_Command)