The file output for Relive is mp4 which for some reason is not compatible with windows media player and wont upload to youtube, please help. -AshenB
Having a similar problem, I can't seem to import any video relive outputs in any video editor.
Regarding your problem, download K-LITE codec pack, here:
Download K-Lite Codec Pack Mega
its the mega version so you wont have any trouble playing mp4s
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