Add new argument in iteration input to control subtitle font size.

specification/cognitiveservices/Speech.VideoTranslation/main.tsp

@@ -263,6 +263,10 @@ model IterationInput {
   @doc("This parameter specifies the outline color of the subtitles in the video translation output. The value should be provided in the format <rr><gg><bb>, #<rr><gg><bb>, <rr><gg><bb><aa> or #<rr><gg><bb><aa>, where <rr> represents the red component of the color, <gg> represents the green component, <bb> represents the blue component, <aa> represents the alpha component. For example, EBA205 or #EBA205  would set the subtitle color to a specific shade of yellow. This parameter allows for customization of subtitle appearance to enhance readability and visual appeal")
   subtitleOutlineColor?: string;
 
+  @added(ApiVersions.v2025_05_20)
+  @doc("Subtitle font size.")
+  subtitleFontSize?: int32;
+
   @added(ApiVersions.v2025_05_20)
   @doc("This parameter specifies whether or not enable the emotion for platform voice, by default let server to decide whether enable emotion for better quality for the target locale.")
   enableEmotionalPlatformVoice?: EnableEmotionalPlatformVoice;

specification/cognitiveservices/data-plane/Speech/VideoTranslation/stable/2025-05-20/VideoTranslation.json

@@ -979,6 +979,11 @@
           "type": "string",
           "description": "This parameter specifies the outline color of the subtitles in the video translation output. The value should be provided in the format <rr><gg><bb>, #<rr><gg><bb>, <rr><gg><bb><aa> or #<rr><gg><bb><aa>, where <rr> represents the red component of the color, <gg> represents the green component, <bb> represents the blue component, <aa> represents the alpha component. For example, EBA205 or #EBA205  would set the subtitle color to a specific shade of yellow. This parameter allows for customization of subtitle appearance to enhance readability and visual appeal"
         },
+        "subtitleFontSize": {
+          "type": "integer",
+          "format": "int32",
+          "description": "Subtitle font size."
+        },
         "enableEmotionalPlatformVoice": {
           "$ref": "#/definitions/EnableEmotionalPlatformVoice",
           "description": "This parameter specifies whether or not enable the emotion for platform voice, by default let server to decide whether enable emotion for better quality for the target locale."