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8467939538
The default implementation for packet loss handling previously always sent a gap event. While this is correct as long as we know the packet that was lost was actually a media packet, with ULPFEC this becomes a bit more complicated, as we do not know whether the packet that was lost was a FEC packet, in which case it is better to not actually send any gap events in the default implementation. Some payloaders can be more clever about, for example VP8 can use the picture-id, and the M and S bits to determine whether the missing packet was inside an encoded frame or outside, and thus whether if it was a media packet or a FEC packet, which is why ulpfecdec still lets these lost events go through, though stripping them of their seqnum, and appending a new "might-have-been-fec" field to them. This is all a bit terrible, but necessary to have ULPFEC integrate properly with the rest of our RTP stack. https://bugzilla.gnome.org/show_bug.cgi?id=794909 |
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