diff --git a/frigate/ffmpeg_presets.py b/frigate/ffmpeg_presets.py
index 75e2b901d..ec40bf0c5 100644
--- a/frigate/ffmpeg_presets.py
+++ b/frigate/ffmpeg_presets.py
@@ -436,7 +436,7 @@ def parse_preset_input(arg: Any, detect_fps: int) -> list[str]:
 
     if arg == "preset-http-jpeg-generic":
         input = PRESETS_INPUT[arg].copy()
-        input[len(_user_agent_args) + 1] = str(detect_fps)
+        input[1] = str(detect_fps)
         return input
 
     return PRESETS_INPUT.get(arg, None)