Function run_shared_decode_pump_blocking 

pub fn run_shared_decode_pump_blocking(
    cfg: DecodePumpConfig,
    input_data: Bytes,
    senders: Vec<Sender<VideoFrame>>,
    rt: Handle,
) -> Result<u64>

Single-input decode pump (no trim, no concat) — the common case. A thin wrapper over run_spliced_decode_pump_blocking with one whole clip.