class Lolcommits::CaptureMacAnimated
Public Instance Methods
capture()
click to toggle source
# File lib/lolcommits/capture_mac_animated.rb, line 4 def capture # make a fresh frames directory FileUtils.rm_rf(frames_location) FileUtils.mkdir_p(frames_location) # capture the raw video with videosnap system_call "#{videosnap_bin} -s 240 #{capture_device_string}#{capture_delay_string}-t #{animated_duration} --no-audio #{video_location} > /dev/null" if File.exists?(video_location) # convert raw video to png frames with ffmpeg system_call "ffmpeg -v quiet -i #{video_location} -t #{animated_duration} #{frames_location}/%09d.png" # use fps to set delay and number of frames to skip (for lower filesized gifs) fps = video_fps(video_location) skip = frame_skip(fps) delay = frame_delay(fps, skip) debug "Capturer: anaimated gif choosing every #{skip} frames with a frame delay of #{delay}" # create the looping animated gif from frames (picks nth frame with seq) seq_command = "seq -f #{frames_location}/%09g.png 1 #{skip} #{Dir["#{frames_location}/*"].length}" # convert to animated gif with delay and gif optimisation system_call "convert -layers OptimizeTransparency -delay #{delay} -loop 0 `#{seq_command}` -coalesce #{snapshot_location}" end end
Private Instance Methods
capture_delay_string()
click to toggle source
# File lib/lolcommits/capture_mac_animated.rb, line 66 def capture_delay_string "-w '#{capture_delay}' " if capture_delay.to_i > 0 end
capture_device_string()
click to toggle source
# File lib/lolcommits/capture_mac_animated.rb, line 62 def capture_device_string "-d '#{capture_device}' " if capture_device end
frame_delay(fps, skip)
click to toggle source
# File lib/lolcommits/capture_mac_animated.rb, line 34 def frame_delay(fps, skip) # calculate frame delay delay = ((100.0 * skip)/fps.to_f).to_i delay < 6 ? 6 : delay # hard limit for IE browsers end
frame_skip(fps)
click to toggle source
# File lib/lolcommits/capture_mac_animated.rb, line 46 def frame_skip(fps) # of frames to skip depends on movie fps case(fps) when 0..15 2 when 16..28 3 else 4 end end
system_call(call_str, capture_output = false)
click to toggle source
# File lib/lolcommits/capture_mac_animated.rb, line 29 def system_call(call_str, capture_output = false) debug "Capturer: making system call for \n #{call_str}" capture_output ? `#{call_str}` : system(call_str) end
video_fps(file)
click to toggle source
# File lib/lolcommits/capture_mac_animated.rb, line 40 def video_fps(file) # inspect fps of the captured video file (default to 29.97) fps = system_call("ffmpeg -i #{file} 2>&1 | sed -n \"s/.*, \\(.*\\) fp.*/\\1/p\"", true) fps.to_i < 1 ? 29.97 : fps.to_f end
videosnap_bin()
click to toggle source
# File lib/lolcommits/capture_mac_animated.rb, line 58 def videosnap_bin File.join(Configuration::LOLCOMMITS_ROOT, 'vendor', 'ext', 'videosnap', 'videosnap') end