Function mixed_body 

pub fn mixed_body(
    model: &str,
    png: &[u8],
    mime: &str,
    video: &[u8],
    prompt: &str,
    max_tokens: usize,
) -> Value

2026-09-26: One request carrying an image, then a video, then prompt. The image part is labelled image/png whatever its bytes; the server picks the image decoder from the bytes (model-layers/src/vision_preprocess.rs).