Add configurable variable QP for video

assets/sunshine.conf

@@ -20,7 +20,7 @@ ping_timeout = 2000
 # How much error correcting packets must be send for every video max_b_frames
 # This is just some random number, don't know the optimal value
 # The higher fec_percentage, the lower space for the actual data to send per frame there is
-fec_percentage = 25
+fec_percentage = 1
 
 ###############################################
 # FFmpeg software encoding parameters
@@ -29,15 +29,21 @@ fec_percentage = 25
 max_b_frames = 16
 gop_size = 24
 
-# Constant Rate Factor. Between 1 and 52.
+# Constant Rate Factor. Between 1 and 52. It allows QP to go up during motion and down with still image, resulting in constant perceived quality
 # Higher value means more compression, but less quality
-crf = 28
+# If crf == 0, then use QP directly instead
+crf = 0
+
+# Quantitization Parameter
+# Higher value means more compression, but less quality
+# If crf != 0, then this parameter is ignored
+qp = 28
 
 # Number of threads used by ffmpeg to encode the video
-# threads = 4
+threads = 8
 
 
 # See x264 --fullhelp for the different presets
-# profile = baseline
-# preset  = superfast
-# tune    = zerolatency
+profile = baseline
+preset  = superfast
+tune    = zerolatency