ffmpeg & gst-launch commands

video camera:
gst-launch -v v4l2src ! video/x-raw-yuv,width=640,height=480,framerate=30/1 ! ffmpegcolorspace ! ximagesink

video capture:
ffmpeg -y -f alsa -i plughw:CARD=Mic,DEV=0 -f x11grab -r 30 -s 1830×1030 -i :0.0+0,26 -acodec ac3 -vcodec libx264 -vpre lossless_ultrafast -threads 0 abwcomm_V1_pid.mkv

ffmpeg -y -i abwcomm_V1_pid.mkv -vf pad=1920:1080:50:25 -vcodec libx264 -acodec ac3 -vpre lossless_ultrafast output.mkv

convert to ipad format using quicktime on mac. ffmpeg can do it, but finding the toggles takes more time than using a conversion product.

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