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annotate python/ffslice.py @ 741:9681a0bd74d6

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add utility for slicing video files
author Jeff Hammel <k0scist@gmail.com>
date Sun, 28 Jun 2015 11:56:13 -0700
parents
children f011ec45b8e8
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741
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1 #!/usr/bin/env python
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2 # -*- coding: utf-8 -*-
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3
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4 """
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5 slice a clip with `ffmpeg`:
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6
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7 ffmpeg -ss <00:00:00> -t <sec> -i <input_file> -q 1 <output_file> #
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8
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9 --ss = start time ;
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10
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11 -t = length of video to create from the start time in seconds.
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12 """
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13
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14 # imports
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15 import argparse
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16 import os
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17 import subprocess
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18 import sys
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19
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20 # module globals
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21 __all__ = ['main', 'Parser']
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22 here = os.path.dirname(os.path.realpath(__file__))
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23 string = (str, unicode)
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24
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25
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26 def ensure_dir(directory):
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27 """ensure a directory exists"""
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28 if os.path.exists(directory):
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29 assert os.path.isdir(directory)
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30 return directory
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31 os.makedirs(directory)
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32 return directory
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33
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34
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35 def convert_seconds_to_hhmmss(time_sec):
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36 """converts `time_sec` to (hh,mm,ss)"""
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37
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38 hh = int(time_sec / 3600)
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39 mm = int((time_sec % 3600) / 60)
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40 ss = int((time_sec % 3600) % 60)
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41 return (hh,mm,ss)
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42
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43
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44 def format_seconds_to_hhmmss(time_sec, separator=':'):
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45 """converts `time_sec` to string 'hh:mm:ss'"""
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46 return separator.join(['{:0>2d}'.format(i)
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47 for i in convert_seconds_to_hhmmss(time_sec)])
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48
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49
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50 def duration(clip, ffprobe='ffprobe'):
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51 """get the duration in seconds using `ffprobe` from ffmpeg"""
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52
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53 command = [ffprobe, clip]
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54 assert os.path.exists(clip), "Missing clip, duration not available"
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55
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56 # probe the file
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57 try:
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58 output = subprocess.check_output(command, stderr=subprocess.STDOUT)
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59 # (for some reason, ffprobe sends output to stderr)
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60 except subprocess.CalledProcessError as e:
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61 print (e.output)
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62 raise
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63
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64 duration = None
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65 for line in output.splitlines():
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66 # Parse the output of `ffprobe`
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67 # look for a line like:
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68 # Duration: 00:00:59.73, start: 0.000000, bitrate: 7783 kb/s
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69
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70 line = line.strip()
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71 if line.startswith("Duration:"):
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72 if duration:
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73 raise AssertionError("Duplicate duration - already found: {}".format(duration))
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74 line = line.split(',')[0]
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75 duration = line.split(':', 1)[1].strip()
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76
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77 if duration:
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78 hh, mm, ss = [float(i) for i in duration.split(':')]
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79 duration = 3600*hh + 60*mm + ss
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80
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81 return duration
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82
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83
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84 class FFSliceParser(argparse.ArgumentParser):
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85 """fflice CLI option parser"""
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86
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87 default_slice_time = 300.
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88
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89 def __init__(self):
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90 argparse.ArgumentParser.__init__(self, description=__doc__)
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91 self.add_argument('clips', metavar='clip', nargs='+', help="clips to slice")
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92 self.add_argument('-d', '--directory', dest='directory',
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93 default=os.getcwd(),
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94 help="output directory [DEFAULT: %(default)s]")
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95 self.add_argument('--durations', '--print-durations', dest='print_durations',
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96 action='store_true', default=False,
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97 help="print durations and exit")
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98 self.add_argument('-n', dest='number', type=int,
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99 help="number of slices")
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100 self.add_argument('-t', '--time', dest='slice_time',
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101 type=float,
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102 help="time of each slice [DEFAULT: {}]".format(self.default_slice_time))
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103 self.add_argument('--dry-run', dest='dry_run',
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104 action='store_true', default=False,
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105 help="print out what will be done")
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106 self.add_argument('--hhmmss', dest='hhmmss',
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107 action='store_true', default=False,
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108 help="display times in 'hh:mm:ss' format; thedefault is in seconds")
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109
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110 self.add_argument('-v', '--verbose', dest='verbose',
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111 action='store_true', default=False,
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112 help="be verbose")
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113 self.options = None
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114
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115 def parse_args(self, *args, **kw):
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116 options = argparse.ArgumentParser.parse_args(self, *args, **kw)
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117 self.validate(options)
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118 self.options = options
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119 return options
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120
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121 def validate(self, options):
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122 """validate options"""
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123
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124 missing = [clip for clip in options.clips
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125 if not os.path.exists(clip)]
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126 if missing:
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127 self.error("Not found: {}".format(', '.join(missing)))
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128
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129 if options.slice_time and options.number:
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130 self.error("Cannot specify slice time and number of slices")
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131 # TODO: allow specification of both
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132 elif options.slice_time is None and options.number is None:
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133 options.slice_time = self.default_slice_time
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134
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135 ensure_dir(options.directory)
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136
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137 def format_seconds(self, seconds):
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138 """format seconds to string"""
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139 if self.options.hhmmss:
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140 return format_seconds_to_hhmmss(seconds)
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141 return '{:.2}'.format(seconds)
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142
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143
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144 def main(args=sys.argv[1:]):
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145 """CLI"""
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146
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147 # parse command line options
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148 parser = FFSliceParser()
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149 options = parser.parse_args(args)
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150
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151 # compute durations
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152 durations = {clip: duration(clip) for clip in options.clips}
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153 if options.print_durations:
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154 returncode = 0
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155 total = 0.
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156 for clip in options.clips:
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157 _duration = durations[clip]
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158 if _duration is None:
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159 print ("Duration not found: '{}'".format(clip))
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160 returncode = 1
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161 else:
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162 print ('{} : {}'.format(clip,
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163 parser.format_seconds(_duration)))
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164 sys.exit(returncode)
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165
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166 if __name__ == '__main__':
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167 main()
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168