when I use libav* in server environment, I usually need that calls to av_read_frame return with some error code when input is not available [such as when multicast udp feed is down] this can be achieved if the udp protocol is opened with the URL_FLAG_NONBLOCK flag.
the question is: how can I make sure the protocol is opened with the said URL_FLAG_NONBLOCK flag, when the av_open_input_file() function doesn't give me an opportunity to specify this flag? Thank A.
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