Constant VIDEO_PAD_TOKEN_ID 

pub const VIDEO_PAD_TOKEN_ID: u32 = _; // 151_656u32

Fallback <|video_pad|> id, used when the checkpoint’s config declares none. Qwen3-VL’s video token sits directly after its image token, and the same holds for Qwen3.6/3.8 (248056 / 248057) — but a checkpoint that declares its own always wins, exactly as for the image token.