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video:start [01/03/2019 19:06]
andrew created
video:start [01/03/2019 19:22] (current)
andrew
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 ====== Video ====== ====== Video ======
 +
 +[[https://​trac.ffmpeg.org/​wiki/​Capture/​Blackmagic]]
 +
 + Use the x11grab device:
 +
 +ffmpeg -video_size 1024x768 -framerate 25 -f x11grab -i :​0.0+100,​200 output.mp4
 +
 +This will grab the image from desktop, starting with the upper-left corner at x=100, y=200 with a width and height of 1024⨉768.
 +
 +If you need audio too, you can use ALSA (see Capture/​ALSA for more info):
 +
 +ffmpeg -video_size 1024x768 -framerate 25 -f x11grab -i :​0.0+100,​200 -f alsa -ac 2 -i hw:0 output.mkv
 +
 +Or the pulse input device:
 +
 +ffmpeg -video_size 1024x768 -framerate 25 -f x11grab -i :​0.0+100,​200 -f pulse -ac 2 -i default output.mkv
 +
 +
 +https://​forum.blackmagicdesign.com/​viewtopic.php?​f=3&​t=11840
 +
 +Input:​- ​
 +https://​www.ffmpeg.org/​ffmpeg-devices.html#​decklink
 +
 +Output:-
 +https://​www.ffmpeg.org/​ffmpeg-devices.html#​decklink-1
 +
 +
 +
 +https://​stackoverflow.com/​questions/​49583019/​how-to-compile-blackmagic-sdk-to-ffmpeg
 +
 +https://​video.stackexchange.com/​questions/​20536/​ffmpeg-and-decklink-how-to-specify-audio-input-for-hdmi-video
 +
 +
  
  

video/start.txt · Last modified: 01/03/2019 19:22 by andrew