Add a background video behind the SBS.

The video is CC0. Download from https://storage.sesse.net/flow-720.mp4
or recreate by:

  youtube-dl 'https://www.youtube.com/watch?v=acdWTm5P3-g'
  ffmpeg -i ./Blue\ Particles\ Flowing\ _\ 4K\ Relaxing\ Screensaver-acdWTm5P3-g.f313.webm -filter:v "setpts=PTS*25.0*(1001.0/30000.0),crop=w=1920:h=1080:x=640:y=320,scale=1280:720,eq=gamma=0.4" -r 30000/1001 -crf 18 -an flow-720.mp4

diff --git a/nageru/ultimate.lua b/nageru/ultimate.lua
index ad29d6d3eb3919f34a3b97d0c58b838e3929117e..771a86369602dcb9eea9d04e5bef706c60578850 100644 (file)
--- a/nageru/ultimate.lua
+++ b/nageru/ultimate.lua
@@ -51,6 +51,8 @@ local cef_path = Nageru.THEME_PATH:match("(.*)/nageru/")
 local cef_input = HTMLInput.new("file://" .. cef_path .. "/score.html")
 cef_input:execute_javascript_async("play()")
 
+local bg_video = VideoInput.new(cef_path .. "/flow-720.mp4", Nageru.VIDEO_FORMAT_YCBCR)
+
 function reload_cef()
        cef_input:reload()
        cef_input:execute_javascript_async("play()")
@@ -217,13 +219,16 @@ end
 function make_sbs_chain(input0_type, input0_overlay, input1_type, hq)
        local chain = EffectChain.new(16, 9)
 
+       local bg = chain:add_video_input(bg_video, false)
+
        local input0 = make_sbs_input(chain, INPUT0_SIGNAL_NUM, input0_type == "livedeint", input0_overlay, hq)
        local input1 = make_sbs_input(chain, INPUT4_SIGNAL_NUM, input1_type == "livedeint", false, hq)
 
-       input0.padding_effect:set_vec4("border_color", 0.0, 0.0, 0.0, 1.0)
+       input0.padding_effect:set_vec4("border_color", 0.0, 0.0, 0.0, 0.0)
        input1.padding_effect:set_vec4("border_color", 0.0, 0.0, 0.0, 0.0)
 
-       chain:add_effect(OverlayEffect.new(), input0.padding_effect, input1.padding_effect)
+       local i0 = chain:add_effect(OverlayEffect.new(), bg, input0.padding_effect)
+       chain:add_effect(OverlayEffect.new(), i0, input1.padding_effect)
        chain:finalize(hq)
 
        return {
@@ -740,6 +745,15 @@ function get_chain(num, t, width, height, signals)
        end
        last_resolution = input_resolution
 
+       -- Save some CPU time if we're not having SBS on live.
+       if live_signal_num == SBS_SIGNAL_NUM or
+          preview_signal_num == SBS_SIGNAL_NUM or
+          transition_type == ZOOM_TRANSITION then
+               bg_video:change_rate(1.0)
+       else
+               bg_video:change_rate(0.0001)
+       end
+
        if num == 0 then  -- Live.
                -- See if we're in a transition.
                finish_transitions(t)