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#! /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 accommodate 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 sys
sys.path.append('/ufs/guido/src/video')
import VFile
import getopt
import string
# Global options
speed = 1.0
mindelta = 0
regen = None
# Main program -- mostly command line parsing
def 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 another
def 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 program
main()
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