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Usage: srtmod.py [<delta>][@<time>] [<delta>][@<time>]
	delta:  One of '+number', '-number' where number is the amount of milliseconds to move the subtitles to the back. If omitted, "+0" is assumed.
	time:   Timestamp in format hh:mm:ss to denote the point at which the denoted shift is desired.
	        If omitted, "00:00:00" is assumed.

By giving two operations with different times, subtitles may be slowed down or sped up.
Subtitles are read from stdin.
Examples:
	Move subs one second to the front everywhere: srtmod.py -1000 < subtitles.srt
	Move subs 500ms to the front at 10min but keep the timing at 5min (speeding them up in result): srtmod.py @5:00 -500@10:00 < subtitles.srt