Su linux posso fare qualcosa di simile:
avconv -f alsa -i pulse -f x11grab -r 25 -s 1400x1050 \
-i :0.0+0,0 -vcodec libx264 -threads 4 \
-acodec libmp3lame video.mkv
ma ovviamente il driver alsa e x11 dovrebbe essere diverso su OS X. Come funzionerebbe questo a fare lo screen-capture video da riga di comando?
Per scattare foto scatti (non film) c'è screencapture :
pse@Mithos:~$ screencapture -h
screencapture: illegal option -- h
usage: screencapture [-icMPmwsWxSCUtoa] [files]
-c force screen capture to go to the clipboard
-C capture the cursor as well as the screen. only in non-interactive modes
-d display errors to the user graphically
-i capture screen interactively, by selection or window
control key - causes screen shot to go to clipboard
space key - toggle between mouse selection and
window selection modes
escape key - cancels interactive screen shot
-m only capture the main monitor, undefined if -i is set
-M screen capture output will go to a new Mail message
-o in window capture mode, do not capture the shadow of the window
-P screen capture output will open in Preview
-s only allow mouse selection mode
-S in window capture mode, capture the screen not the window
-t<format> image format to create, default is png (other options include pdf, jpg, tiff and other formats)
-T<seconds> Take the picture after a delay of <seconds>, default is 5
-w only allow window selection mode
-W start interaction in window selection mode
-x do not play sounds
-a do not include windows attached to selected windows
-r do not add dpi meta data to image
-l<windowid> capture this windowsid
-R<x,y,w,h> capture screen rect
-B<bundleid> screen capture output will open in app with bundleidBS
files where to save the screen capture, 1 file per screen
Per catturare video, il modo più semplice è usare l'opzione Cattura schermo in Quicktime Player. Dovrebbe anche essere possibile iniziarlo da Terminal con un applescript (che va oltre le mie capacità).
Leggi altre domande sui tag command-line macos screen-capture