make av_interleaved_write_frame() flush packets when pkt is NULL
This patch allows the user to force flushing of all queued packets by calling av_interleaved_write_frame() with pkt set to NULL. Signed-off-by: NJindrich Makovicka <jindrich.makovicka@nangu.tv> Signed-off-by: NMartin Storsjö <martin@martin.st>
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