fix(linux/vulkan): change default rate control from VBR to CBR (#5032)

docs/configuration.md

@@ -3029,13 +3029,13 @@ editing the `conf` file in a text editor. Use the examples as reference.
     <tr>
         <td>Default</td>
         <td colspan="2">@code{}
-            4
+            2
             @endcode</td>
     </tr>
     <tr>
         <td>Example</td>
         <td colspan="2">@code{}
-            vk_rc_mode = 2
+            vk_rc_mode = 4
             @endcode</td>
     </tr>
     <tr>

src/config.cpp

@@ -503,7 +503,7 @@ namespace config {
 
     {
       2,  // vk.tune (default: ll - low latency)
-      4,  // vk.rc_mode (default: vbr)
+      2,  // vk.rc_mode (default: cbr)
     },
 
     {},  // capture

src_assets/common/assets/web/config.html

@@ -338,7 +338,7 @@
             name: "Vulkan Encoder",
             options: {
               "vk_tune": 2,
-              "vk_rc_mode": 4,
+              "vk_rc_mode": 2,
             },
           },
           {

src_assets/common/assets/web/public/assets/locale/en.json

@@ -381,11 +381,11 @@
     "upnp_desc": "Automatically configure port forwarding for streaming over the Internet",
     "vaapi_strict_rc_buffer": "Strictly enforce frame bitrate limits for H.264/HEVC on AMD GPUs",
     "vaapi_strict_rc_buffer_desc": "Enabling this option can avoid dropped frames over the network during scene changes, but video quality may be reduced during motion.",
-    "vk_rc_cbr": "CBR (Constant Bitrate)",
+    "vk_rc_cbr": "CBR (Constant Bitrate) (default)",
     "vk_rc_cqp": "CQP (Constant QP)",
     "vk_rc_mode": "Rate Control",
     "vk_rc_mode_desc": "Rate control mode for encoding. Auto lets the driver decide.",
-    "vk_rc_vbr": "VBR (Variable Bitrate) (default)",
+    "vk_rc_vbr": "VBR (Variable Bitrate)",
     "vk_tune": "Tuning",
     "vk_tune_desc": "Low latency modes reduce encoding delay at the cost of quality.",
     "vk_tune_hq": "High Quality (hq)",