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• How to capture a timed screen recording on a Mac with ffmpeg

  28 septembre 2016, par wetjosh

  I’m on a Mac with MacOS Sierra installed. I’ve installed ffmpeg with homebrew. I list my devices via :

  ffmpeg -f avfoundation -list_devices true -i ""

  which returns :

  [AVFoundation input device @ 0x7fc2de40e840] AVFoundation video devices:
  
  [AVFoundation input device @ 0x7fc2de40e840] [0] FaceTime HD Camera
  
  [AVFoundation input device @ 0x7fc2de40e840] [1] Capture screen 0
  
  [AVFoundation input device @ 0x7fc2de40e840] AVFoundation audio devices:
  
  [AVFoundation input device @ 0x7fc2de40e840] [0] Built-in Microphone

  I don’t need audio so I start my 5 second screen recording via :

  ffmpeg -f avfoundation -t '5' -i '1' test.mov

  It creates an mov file in the working directory but doesn’t stop after 5 seconds. In fact, I can’t even stop the recording as it suggests by pressing ’q’. Ctl-C doesn’t work either, and I am left with force quitting via Activity Monitor. I’ve tried this same command but using device 0 (FaceTime camera) and it stops after 5 seconds.

  If someone can solve that riddle, my next question is how can I watch the newly created file in quicktime (I’m thinking I’ll need to encode or decode or something) because even the FaceTime video file would not open in QuickTime. It just says "The document could not be opened". It does, however, open with VLC.

  UPDATE : I’ve tried this on an older OS (Yosemite) and got the same results (thought it might be the new OS that broke it).

• How to detect the real orientation of a video recorded by mobile with "auto rotate" disabled

  28 octobre 2022, par FlamingMoe

  When you record a video, the rotation metadata has 4 possible values (0, 90, 180 and 270) and it stores how the device was held when starting the recording.

  


  But mobile phones has also a feature to enable or disable "auto rotation" of screen.

  


  It's very typical, nowadays, to have that feature disable, and many people record videos with the phone horizontally, but since the "auto rotation" is disable, the metadata stores like the video was recorded as vertically.

  


  How to handle this ?

  


• ffmpeg avfoundation (Mac OS X) capture second screen desktop

  1er août 2016, par user1706674

  I am use console ffmpeg, if I capture from first monitor, then all is well

  ./ffmpeg -video_size 640x480 -framerate 30 -f avfoundation -capture_cursor 1 -capture_mouse_clicks 1 -i 1:0 -c:v libx264 -qp 0 -preset ultrafast capture.mp4

  if try capture from the second monitor then process hangs

  ./ffmpeg -video_size 640x480 -framerate 30 -f avfoundation -capture_cursor 1 -capture_mouse_clicks 1 -i 2:0 -c:v libx264 -qp 0 -preset ultrafast capture.mp4

  My device list :

  AVFoundation input device @ 0x7fc74141a0c0] AVFoundation video devices:
  
  [AVFoundation input device @ 0x7fc74141a0c0] [0] HD-camera FaceTime (integrated)
  
  [AVFoundation input device @ 0x7fc74141a0c0] [1] Capture screen 0
  
  [AVFoundation input device @ 0x7fc74141a0c0] [2] Capture screen 1
  
  [AVFoundation input device @ 0x7fc74141a0c0] AVFoundation audio devices:
  
  [AVFoundation input device @ 0x7fc74141a0c0] [0] Built-in Input
  
  [AVFoundation input device @ 0x7fc74141a0c0] [1] Boom2Device

  But if I replace output format from mp4 to mkv then record is well on second monitor too ! How fix this bug ?