I was basing what I said on the http.py file:

while True:
                try:
                    # Download and write
                    data_block = ctx.data.read(block_size if not is_test else min(block_size, data_len - byte_counter))
                except TransportError as err:
                    retry(err)

                byte_counter += len(data_block)

I might still be wrong but that’s how I thought it downloaded any video file over http

Edit. After reading the code a bit more I see that you were correct.