lavf/prompeg: prompeg_write() must report data all was written
Previously, prompeg_write() would only report to caller that bytes we
written when a FEC packet was actually created. Not all RTP packets are
expected to generate a FEC packet however, so this behavior was causing
avio to retry writing the RTP packet, eventually forcing the FEC state
machine to send a FEC packet erroneously (and so breaking out of the
retry loop).
This was resulting in incorrect FEC data being generated, and far too
many FEC packets to be sent (~100% FEC overhead).
fix #7863
Signed-off-by:
David Holroyd <david.holroyd@m2amedia.tv>
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