asfdemux/realmedia: Drop duplicate seek events.
Also use seek seqnum for flush & segment events/messages for realmedia.
Wasn't sure if rademux also needed to be done. Can a demuxer with a single src receive duplicate seeks?
Also use seek seqnum for flush & segment events/messages for realmedia.
Wasn't sure if rademux also needed to be done. Can a demuxer with a single src receive duplicate seeks?