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• FFmpeg is blocking the input video file while using GStreamer as backend with EmguCV VideoCapture [closed]

  18 octobre 2023, par Riya Sharma

  I am using EmguCV VideoCapture object with GStreamer as backend inorder to capture input video and converting it to frames. The frames are being saved in memory. Once all the frames are captured, i am trying to delete the input video file. FFmpeg is also being used simultaneously inorder to convert the frames (saved in memory) to the output video.

  


  While deleting the input video file, I am getting the error - cannot access the file because it is being used by another process.

  


  Since FFmpeg is being used at the output end and it is not having access to the input video file, it should not access the input video file. But using resource monitor, got to know that FFmpeg is blocking the input video file and therefore it is not getting deleted. Seems like FFmpeg is using some GStreamer dependencies.

  


  Does anyone have any idea on how to resolve this issue ?

  


• Ffmpeg is blocking the input video file while using GStreamer as backend with EmguCv VideoCapture [closed]

  9 octobre 2023, par Riya Sharma

  I am getting the error -
cannot access the file because it is being used by another process

  


  I am using EmguCV VideoCapture object inorder to capture input video and converting it to frames.
The frames are being saved in memory. Once all the frames are captured, i am trying to delete the input file. After that ffmpeg is being used inorder to convert the frames to the output video.

  


  When i am using reader=new VideoCapture(filepath) ; everything works fine but when i use the following -

  


  string pipeline=“filesrc location=filepath ! decodebin ! videoconvert ! appsink” ;
reader=new VideoCapture(pipeline,VideoCapture.API.Gstreamer) ;

  


  The code starts giving error -
cannot access the file because it is being used by another process

  


  Using resource monitor, got to know that ffmpeg is blocking the input file.

  


  I am using GStreamer at the input end whereas Ffmpeg at the output end. So Ffmpeg should not access the input file but still it is accessing and blocking it and therefore the input file is not getting deleted.

  


  Does anyone have any idea on how to resolve this issue ?

  


• ffmpeg refuses to use audio device together with video capture (gdigrab)

  27 septembre 2023, par Ralf_Reddings

  I want to capture a recording of my screen along with sound. I have been able to peace together various SO answers and the documentation but I am struggling to put it all together.

  


  With the following I can capture a video recording of my primary monitor :

  


  ffmpeg -f gdigrab -framerate 30 -offset_x 0 -offset_y 0 -video_size 2560x1440 -show_region 1 -i desktop output.mp4 -y


  


  I can also capture audio from a playing video with :

  


  ffmpeg -f dshow -i audio="virtual-audio-capturer" output.m4a -y


  


  I want to combine the two and capture a video and its sound that is playing.

  


  cffmpeg -f gdigrab audio="virtual-audio-capturer" -framerate 30 -offset_x 0 -offset_y 0 -video_size 2560x1440 -show_region 1 -i desktop output.mkv -y


  


  Gives me an error :

  


  desktop: No such file or directory


  


  Various other tries just return more errors. What am I doing wrong ?

  


  Also I am not particular about dshow or gdigrab, I am not sure what they are anyways. I just need it to work