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WIP: Seek on all streams

David Phung requested to merge seek-on-all-streams into master

The problem: This check is wrong: priv->blocking_msg_received == nbr_active_streams (media). Because when there are 2 stream but only 1 is complete, we will get a timing problem if the incomplete stream prerolls first.

The solution: Remove that check, so that now we always wait for all streams to preroll.

The consequential problem: If we have a pipeline with 2 separate streams, one is complete, the other one is not. When we do a seek on it, only the complete stream will receive the seek event. Therefore only this stream will preroll.

This patch: Send the seek event to all streams. If the stream is complete, send the seek event to the sink like usual. If not, send to the corresponding src_pad in the rtpbin. Now all streams will preroll.

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