#! /usr/bin/env python# Manipulate the time base of CMIF movies# Possibilities:## - resample at a fixed rate# - divide the time codes by a speed factor (to make it go faster/slower)# - drop frames that are less than n msec apart (to accomodate slow players)# Usage:## Vtime [-m msec] [-r msec] [-s speed] [infile [outfile]]# Options:## -m n       : drop frames closer than n msec (default 0)# -r n       : regenerate input time base n msec apart# -s speed   : speed change factor after other processing (default 1.0)# infile     : input file (default film.video)# outfile    : output file (default out.video)import syssys.path.append('/ufs/guido/src/video')import VFileimport getoptimport string# Global optionsspeed = 1.0mindelta = 0regen = None# Main program -- mostly command line parsingdef main():	global speed, mindelta	opts, args = getopt.getopt(sys.argv[1:], 'm:r:s:')	for opt, arg in opts:		if opt == '-m':			mindelta = string.atoi(arg)		elif opt == '-r':			regen = string.atoi(arg)		elif opt == '-s':			speed = float(eval(arg))	if len(args) < 1:		args.append('film.video')	if len(args) < 2:		args.append('out.video')	if len(args) > 2:		sys.stderr.write('usage: Vtime [options] [infile [outfile]]\n')		sys.exit(2)	sts = process(args[0], args[1])	sys.exit(sts)# Copy one file to anotherdef process(infilename, outfilename):	try:		vin = VFile.BasicVinFile(infilename)	except IOError, msg:		sys.stderr.write(infilename + ': I/O error: ' + `msg` + '\n')		return 1	except VFile.Error, msg:		sys.stderr.write(msg + '\n')		return 1	except EOFError:		sys.stderr.write(infilename + ': EOF in video file\n')		return 1	try:		vout = VFile.BasicVoutFile(outfilename)	except IOError, msg:		sys.stderr.write(outfilename + ': I/O error: ' + `msg` + '\n')		return 1	vout.setinfo(vin.getinfo())	vout.writeheader()		told = 0	nin = 0	nout = 0	tin = 0	tout = 0	while 1:		try:			tin, data, cdata = vin.getnextframe()		except EOFError:			break		nin = nin + 1		if regen:			tout = nin * regen		else:			tout = tin		tout = int(tout / speed)		if tout - told < mindelta:			continue		told = tout		vout.writeframe(tout, data, cdata)		nout = nout + 1	vout.close()	vin.close()# Don't forget to call the main programmain()