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

sunshine/config.cpp

@@ -19,6 +19,7 @@ video_t video {
   16, // max_b_frames
   24, // gop_size
   35, // crf
+  35, // qp
 
   4, // threads
 
@@ -121,6 +122,7 @@ void parse_file(const char *file) {
   int_f(vars, "max_b_frames", video.max_b_frames);
   int_f(vars, "gop_size", video.gop_size);
   int_f(vars, "crf", video.crf);
+  int_f(vars, "qp", video.qp);
   int_f(vars, "threads", video.threads);
   string_f(vars, "profile", video.profile);
   string_f(vars, "preset", video.preset);

sunshine/config.h

@@ -10,6 +10,7 @@ struct video_t {
   int max_b_frames;
   int gop_size;
   int crf; // higher == more compression and less quality
+  int qp; // higher == more compression and less quality, ignored if crf != 0
 
   int threads; // Number threads used by ffmpeg
 

sunshine/stream.cpp

@@ -876,7 +876,7 @@ void cmd_announce(host_t &host, peer_t peer, msg_t &&req) {
     config.monitor.height         = util::from_view(args.at("x-nv-video[0].clientViewportHt"sv));
     config.monitor.width          = util::from_view(args.at("x-nv-video[0].clientViewportWd"sv));
     config.monitor.framerate      = util::from_view(args.at("x-nv-video[0].maxFPS"sv));
-    config.monitor.bitrate        = util::from_view(args.at("x-nv-video[0].initialBitrateKbps"sv));
+    config.monitor.bitrate        = util::from_view(args.at("x-nv-vqos[0].bw.maximumBitrateKbps"sv));
     config.monitor.slicesPerFrame = util::from_view(args.at("x-nv-video[0].videoEncoderSlicesPerFrame"sv));
 
   } catch(std::out_of_range &) {

sunshine/video.cpp

@@ -103,6 +103,7 @@ void encodeThread(
   ctx->pix_fmt = AV_PIX_FMT_YUV420P;
   ctx->max_b_frames = config::video.max_b_frames;
   ctx->gop_size = config::video.gop_size;
+  ctx->has_b_frames = 1;
 
   ctx->slices = config.slicesPerFrame;
   ctx->thread_type = FF_THREAD_SLICE;
@@ -114,8 +115,13 @@ void encodeThread(
   av_dict_set(&options, "preset", config::video.preset.c_str(), 0);
   av_dict_set(&options, "tune", config::video.tune.c_str(), 0);
 
-  av_dict_set_int(&options, "crf", config::video.crf, 0);
-
+  if(config::video.crf != 0) {
+    av_dict_set_int(&options, "crf", config::video.crf, 0);
+  }
+  else {
+    av_dict_set_int(&options, "qp", config::video.qp, 0);
+  }
+  
   ctx->flags |= (AV_CODEC_FLAG_CLOSED_GOP | AV_CODEC_FLAG_LOW_DELAY);
   ctx->flags2 |= AV_CODEC_FLAG2_FAST;
 
@@ -126,7 +132,6 @@ void encodeThread(
   yuv_frame->width = ctx->width;
   yuv_frame->height = ctx->height;
 
- // yuv_frame->opaque = 0;
   av_frame_get_buffer(yuv_frame.get(), 0);
 
   int64_t frame = 1;
@@ -146,8 +151,6 @@ void encodeThread(
     if(idr_events->peek()) {
       yuv_frame->pict_type = AV_PICTURE_TYPE_I;
       frame = idr_events->pop()->first;
-
-//      ++yuv_frame->opaque;
     }
 
     encode(frame++, ctx, sws, yuv_frame, img, packets);