Function petpet::encode_apng

pub fn encode_apng(
    frames: impl IntoIterator<Item = Frame>,
    output: impl Write,
    filter: FilterType,
    delay_num: u16,
    delay_den: u16
) -> Result<(), Box<dyn Error + Send + Sync>>

Encode Frame to APNG.

Delay = (delay_num / delay_den) sec