Add option to allow HEVC usage on older Intel GPUs without low-power encoding

docs/source/about/advanced_usage.rst

@@ -1424,6 +1424,22 @@ keybindings
 
       qsv_coder = auto
 
+`qsv_slow_hevc <https://localhost:47990/config/#qsv_slow_hevc>`__
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+**Description**
+   This options enables use of HEVC on older Intel GPUs that only support low power encoding for H.264.
+
+   .. Caution:: Streaming performance may be significantly reduced when this option is enabled.
+
+**Default**
+   ``disabled``
+
+**Example**
+   .. code-block:: text
+
+      qsv_slow_hevc = disabled
+
 `AMD AMF Encoder <https://localhost:47990/config/#amd-amf-encoder>`__
 ---------------------------------------------------------------------
 

src/config.cpp

@@ -339,6 +339,7 @@ namespace config {
     {
       qsv::medium,  // preset
       qsv::_auto,  // cavlc
+      false,  // slow_hevc
     },  // qsv
 
     {
@@ -962,6 +963,7 @@ namespace config {
 
     int_f(vars, "qsv_preset", video.qsv.qsv_preset, qsv::preset_from_view);
     int_f(vars, "qsv_coder", video.qsv.qsv_cavlc, qsv::coder_from_view);
+    bool_f(vars, "qsv_slow_hevc", video.qsv.qsv_slow_hevc);
 
     std::string quality;
     string_f(vars, "amd_quality", quality);

src/config.h

@@ -44,6 +44,7 @@ namespace config {
     struct {
       std::optional<int> qsv_preset;
       std::optional<int> qsv_cavlc;
+      bool qsv_slow_hevc;
     } qsv;
 
     struct {

src/video.cpp

@@ -763,7 +763,9 @@ namespace video {
         { "profile"s, (int) qsv::profile_hevc_e::main_10 },
       },
       // Fallback options
-      {},
+      {
+        { "low_power"s, []() { return config::video.qsv.qsv_slow_hevc ? 0 : 1; } },
+      },
       std::nullopt,  // QP rate control fallback
       "hevc_qsv"s,
     },

src_assets/common/assets/web/config.html

@@ -1021,6 +1021,18 @@
           </select>
         </div>
 
+        <!-- Allow Slow HEVC Encoding -->
+        <div class="mb-3">
+          <label for="qsv_slow_hevc" class="form-label">Allow Slow HEVC Encoding</label>
+          <select id="qsv_slow_hevc" class="form-select" v-model="config.qsv_slow_hevc">
+            <option value="enabled">enabled</option>
+            <option value="disabled">disabled (default)</option>
+          </select>
+          <div class="form-text">
+            This can enable HEVC encoding on older Intel GPUs, at the cost of higher GPU usage and worse performance.
+          </div>
+        </div>
+
       </div>
 
       <!-- AMD AMF Encoder Tab -->
@@ -1293,6 +1305,7 @@
             options: {
               "qsv_preset": "medium",
               "qsv_coder": "auto",
+              "qsv_slow_hevc": "disabled",
             },
           },
           {