diff --git a/.vscode/settings.json b/.vscode/settings.json
index 3639717f..24590940 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -34,6 +34,7 @@
     "Cfmrc",
     "choco",
     "cifs",
+    "connectionpool",
     "consoletitle",
     "continuedl",
     "cookiesfrombrowser",
diff --git a/app/library/SegmentEncoders.py b/app/library/SegmentEncoders.py
index 1040b3db..fb333fc3 100644
--- a/app/library/SegmentEncoders.py
+++ b/app/library/SegmentEncoders.py
@@ -7,9 +7,6 @@ import sys
 from pathlib import Path
 from typing import Any, Protocol
 
-SUPPORTED_CODECS: tuple[str] = ("h264_qsv", "h264_nvenc", "h264_amf", "h264_videotoolbox", "h264_vaapi", "libx264")
-"Supported encoder names in order of preference."
-
 
 def has_dri_devices() -> bool:
     """
@@ -40,6 +37,7 @@ def ffmpeg_encoders() -> set[str]:
         set[str]: A set of available ffmpeg encoder names.
 
     """
+    from .config import SUPPORTED_CODECS
     try:
         result: subprocess.CompletedProcess[str] = subprocess.run(
             ["ffmpeg", "-hide_banner", "-loglevel", "error", "-encoders"],  # noqa: S607
@@ -75,6 +73,7 @@ def select_encoder(configured: str) -> str:
         str: The selected concrete encoder name.
 
     """
+    from .config import SUPPORTED_CODECS
     configured = (configured or "").strip()
 
     avail: set[str] = ffmpeg_encoders()
diff --git a/app/library/Segments.py b/app/library/Segments.py
index 5c75b08d..c6dd78a4 100644
--- a/app/library/Segments.py
+++ b/app/library/Segments.py
@@ -10,15 +10,9 @@ from typing import TYPE_CHECKING, Any, ClassVar
 
 from aiohttp import web
 
-from .config import Config
+from .config import SUPPORTED_CODECS, Config
 from .ffprobe import ffprobe
-from .SegmentEncoders import (
-    SUPPORTED_CODECS,
-    encoder_fallback_chain,
-    get_builder_for_codec,
-    has_dri_devices,
-    select_encoder,
-)
+from .SegmentEncoders import encoder_fallback_chain, get_builder_for_codec, has_dri_devices, select_encoder
 
 if TYPE_CHECKING:
     from asyncio.subprocess import Process
diff --git a/app/library/config.py b/app/library/config.py
index d3f099ec..65f5ac1e 100644
--- a/app/library/config.py
+++ b/app/library/config.py
@@ -19,6 +19,9 @@ from .version import APP_BRANCH, APP_BUILD_DATE, APP_COMMIT_SHA, APP_VERSION
 if TYPE_CHECKING:
     from subprocess import CompletedProcess
 
+SUPPORTED_CODECS: tuple[str] = ("h264_qsv", "h264_nvenc", "h264_amf", "h264_videotoolbox", "h264_vaapi", "libx264")
+"Supported encoder names in order of preference."
+
 
 class Config(metaclass=Singleton):
     app_env: str = "production"
@@ -417,6 +420,11 @@ class Config(metaclass=Singleton):
             msg: str = f"Invalid app environment '{self.app_env}' specified. Must be 'production' or 'development'."
             raise ValueError(msg)
 
+        if self.streamer_vcodec and self.streamer_vcodec not in SUPPORTED_CODECS:
+            supported = ", ".join(SUPPORTED_CODECS)
+            msg: str = f"Invalid video codec '{self.streamer_vcodec}' specified. Supported: '{supported}'."
+            raise ValueError(msg)
+
         if "dev-master" == self.app_version:
             self._version_via_git()