Originated in 1080/25p on Canon HV20 'firework' setting. Zoomed up to 1280x720 in Vegas 7, so bit-for-bit in theory. Good subject for mp4 compression with so much black but tendency at high compression for square 'blooms' to appear around larger flares. Sometimes difficult to anticipate where in the frame the 'action' will be, hence the zoom.

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