added hardware encoding

maskiner/laptop/configuration.nix

@@ -32,14 +32,24 @@ in
       frontcam = {
         device = "/dev/v4l/by-id/usb-Generic_HD_WebCam_200901010001-video-index0";
         rtspUrl = "rtsp://192.168.1.143:8554/frontcam";
-        framerate = 15;
+        framerate = 12;
         videoSize = "1280x720";
+        useVaapi = true;
+        vaapiQp = 26;
+        bitrateKbps = 900;
+        maxrateKbps = 1100;
+        bufsizeKbps = 1800;
       };
       webcam = {
         device = "/dev/v4l/by-id/usb-GENERAL_GENERAL_WEBCAM-video-index0";
         rtspUrl = "rtsp://192.168.1.143:8554/webcam";
-        framerate = 15;
+        framerate = 12;
         videoSize = "1280x720";
+        useVaapi = true;
+        vaapiQp = 26;
+        bitrateKbps = 900;
+        maxrateKbps = 1100;
+        bufsizeKbps = 1800;
       };
     };
   };

moduler/services/webcam-rtsp/default.nix

@@ -18,6 +18,13 @@ let
           rtspUrl = cfg.rtspUrl;
           framerate = cfg.framerate;
           videoSize = cfg.videoSize;
+          preset = cfg.preset;
+          bitrateKbps = cfg.bitrateKbps;
+          maxrateKbps = cfg.maxrateKbps;
+          bufsizeKbps = cfg.bufsizeKbps;
+          useVaapi = cfg.useVaapi;
+          vaapiDevice = cfg.vaapiDevice;
+          vaapiQp = cfg.vaapiQp;
         };
       };
 
@@ -47,6 +54,51 @@ in
         default = "1280x720";
         description = "Input video size for the webcam stream.";
       };
+      preset = mkOption {
+        type = types.enum [
+          "ultrafast"
+          "superfast"
+          "veryfast"
+          "faster"
+          "fast"
+          "medium"
+          "slow"
+          "slower"
+          "veryslow"
+        ];
+        default = "veryfast";
+        description = "x264 preset used for software encoding.";
+      };
+      bitrateKbps = mkOption {
+        type = types.nullOr types.int;
+        default = null;
+        description = "Target bitrate in kbps. Set to null for CRF-like unconstrained output.";
+      };
+      maxrateKbps = mkOption {
+        type = types.nullOr types.int;
+        default = null;
+        description = "Maximum bitrate in kbps. Defaults to bitrateKbps when unset.";
+      };
+      bufsizeKbps = mkOption {
+        type = types.nullOr types.int;
+        default = null;
+        description = "Rate-control buffer in kbps. Defaults to 2x bitrateKbps when unset.";
+      };
+      useVaapi = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Use VAAPI hardware encoding (h264_vaapi) instead of libx264.";
+      };
+      vaapiDevice = mkOption {
+        type = types.str;
+        default = "/dev/dri/renderD128";
+        description = "VAAPI render device path used when useVaapi = true.";
+      };
+      vaapiQp = mkOption {
+        type = types.int;
+        default = 24;
+        description = "VAAPI quality parameter (lower means better quality, higher CPU/bitrate).";
+      };
       streams = mkOption {
         type = types.attrsOf (
           types.submodule {
@@ -69,6 +121,51 @@ in
                 default = "1280x720";
                 description = "Input video size for this stream.";
               };
+              preset = mkOption {
+                type = types.enum [
+                  "ultrafast"
+                  "superfast"
+                  "veryfast"
+                  "faster"
+                  "fast"
+                  "medium"
+                  "slow"
+                  "slower"
+                  "veryslow"
+                ];
+                default = "veryfast";
+                description = "x264 preset used for software encoding.";
+              };
+              bitrateKbps = mkOption {
+                type = types.nullOr types.int;
+                default = null;
+                description = "Target bitrate in kbps. Set to null for unconstrained output.";
+              };
+              maxrateKbps = mkOption {
+                type = types.nullOr types.int;
+                default = null;
+                description = "Maximum bitrate in kbps. Defaults to bitrateKbps when unset.";
+              };
+              bufsizeKbps = mkOption {
+                type = types.nullOr types.int;
+                default = null;
+                description = "Rate-control buffer in kbps. Defaults to 2x bitrateKbps when unset.";
+              };
+              useVaapi = mkOption {
+                type = types.bool;
+                default = false;
+                description = "Use VAAPI hardware encoding (h264_vaapi) instead of libx264.";
+              };
+              vaapiDevice = mkOption {
+                type = types.str;
+                default = "/dev/dri/renderD128";
+                description = "VAAPI render device path used when useVaapi = true.";
+              };
+              vaapiQp = mkOption {
+                type = types.int;
+                default = 24;
+                description = "VAAPI quality parameter for h264_vaapi.";
+              };
             };
           }
         );
@@ -81,6 +178,27 @@ in
   config = mkIf cfg.enable {
     systemd.services = mapAttrs' (
       streamName: streamCfg:
+      let
+        maxrateKbps =
+          if streamCfg.maxrateKbps != null then streamCfg.maxrateKbps else streamCfg.bitrateKbps;
+        bufsizeKbps =
+          if streamCfg.bufsizeKbps != null then
+            streamCfg.bufsizeKbps
+          else if streamCfg.bitrateKbps != null then
+            streamCfg.bitrateKbps * 2
+          else
+            null;
+        rateControlArgs =
+          if streamCfg.bitrateKbps != null then
+            "-b:v ${toString streamCfg.bitrateKbps}k -maxrate ${toString maxrateKbps}k -bufsize ${toString bufsizeKbps}k"
+          else
+            "";
+        videoCodecArgs =
+          if streamCfg.useVaapi then
+            "-vaapi_device ${streamCfg.vaapiDevice} -vf format=nv12,hwupload -c:v h264_vaapi -qp ${toString streamCfg.vaapiQp}"
+          else
+            "-vcodec libx264 -tune zerolatency -preset ${streamCfg.preset}";
+      in
       nameValuePair "webcam-rtsp-publisher-${sanitizeName streamName}" {
         description = "Publish webcam stream '${streamName}' to MediaMTX over RTSP";
         wantedBy = [ "multi-user.target" ];
@@ -91,14 +209,7 @@ in
           Type = "simple";
           Restart = "always";
           RestartSec = "2";
-          ExecStart = ''
+          ExecStart = "${pkgs.ffmpeg}/bin/ffmpeg -hide_banner -loglevel warning -f v4l2 -framerate ${toString streamCfg.framerate} -video_size ${streamCfg.videoSize} -i ${streamCfg.device} ${videoCodecArgs} ${rateControlArgs} -f rtsp ${streamCfg.rtspUrl}";
-            ${pkgs.ffmpeg}/bin/ffmpeg \
-              -hide_banner -loglevel warning \
-              -f v4l2 -framerate ${toString streamCfg.framerate} -video_size ${streamCfg.videoSize} \
-              -i ${streamCfg.device} \
-              -vcodec libx264 -tune zerolatency -preset veryfast \
-              -f rtsp ${streamCfg.rtspUrl}
-          '';
         };
       }
     ) effectiveStreams;