code.delx.au - transcoding/blob - encode.py

   1 #!/usr/bin/env python
   2
   3 import commands, optparse, subprocess, sys
   4
   5 class MencoderCommand(object):
   6         codec2opts = {
   7                 "lavc": "-lavcopts",
   8                 "xvid": "-xvidencopts",
   9                 "x264": "-x264encopts",
  10                 "faac": "-faaccopts",
  11                 "mp3lame": "-lameopts",
  12         }
  13
  14         def __init__(self, profile, opts):
  15                 self.profile = profile
  16                 self.opts = opts
  17
  18         def insertOptions(self, cmd):
  19                 def tryOpt(opt, var):
  20                         if var:
  21                                 cmd.append(opt)
  22                                 cmd.append(var)
  23                 tryOpt("-ss", self.opts.startpos)
  24                 tryOpt("-endpos", self.opts.endpos)
  25                 tryOpt("-dvd-device", self.opts.dvd)
  26                 tryOpt("-chapter", self.opts.chapter)
  27                 tryOpt("-aid", self.opts.audioid)
  28                 tryOpt("-vf", self.opts.vfilters)
  29                 tryOpt("-af", self.opts.afilters)
  30
  31         def substValues(self, cmd):
  32                 subst = {
  33                         "vbitrate": self.opts.vbitrate,
  34                         "abitrate": self.opts.abitrate,
  35                         "input": self.opts.input,
  36                         "output": self.opts.output,
  37                 }
  38
  39                 return [x % subst for x in cmd]
  40
  41         def pass1(self):
  42                 p = self.profile
  43                 cmd = []
  44                 cmd += ["mencoder", "%(input)s", "-o", "/dev/null"]
  45                 self.insertOptions(cmd)
  46                 cmd += ["-ovc", p.vcodec, self.codec2opts[p.vcodec], "pass=1:"+p.vopts]
  47                 cmd += ["-oac", "copy"]
  48                 cmd = self.substValues(cmd)
  49                 return cmd
  50
  51         def pass2(self):
  52                 p = self.profile
  53                 cmd = []
  54                 cmd += ["mencoder", "%(input)s", "-o", "%(output)s"]
  55                 self.insertOptions(cmd)
  56                 cmd += ["-ovc", p.vcodec, self.codec2opts[p.vcodec], "pass=2:"+p.vopts]
  57                 cmd += ["-oac", p.acodec, self.codec2opts[p.acodec], p.aopts]
  58                 cmd += self.profile.extra
  59                 cmd = self.substValues(cmd)
  60                 return cmd
  61
  62 class Profile(object):
  63         def __init__(self, CommandClass, **kwargs):
  64                 self.CommandClass = CommandClass
  65                 self.__dict__.update(kwargs)
  66
  67 profiles = {
  68         "qt7" :
  69         Profile(
  70                 CommandClass=MencoderCommand,
  71                 vcodec="x264",
  72                 vopts="bitrate=%(vbitrate)d:me=umh:partitions=all:trellis=1:subq=7:bframes=1:direct_pred=auto",
  73                 acodec="faac",
  74                 aopts="br=%(abitrate)d:mpeg=4:object=2",
  75         ),
  76
  77         "xvid" :
  78         Profile(
  79                 CommandClass=MencoderCommand,
  80                 vcodec="xvid",
  81                 vopts="bitrate=%(vbitrate)d:vhq=4:autoaspect",
  82                 acodec="mp3lame",
  83                 aopts="abr:br=%(abitrate)d",
  84                 extra=["-ffourcc", "DX50"],
  85         ),
  86 }
  87
  88
  89
  90
  91 def parse_args():
  92         for profile_name in profiles.keys():
  93                 if sys.argv[0].find(profile_name) >= 0:
  94                         break
  95         else:
  96                 profile_name = "xvid"
  97
  98         parser = optparse.OptionParser(usage="%prog [options] input output")
  99         parser.add_option("--dvd", action="store", dest="dvd")
 100         parser.add_option("--vfilters", action="store", dest="vfilters")
 101         parser.add_option("--afilters", action="store", dest="afilters")
 102         parser.add_option("--vbitrate", action="store", dest="vbitrate", type="int", default=1000)
 103         parser.add_option("--abitrate", action="store", dest="abitrate", type="int", default=192)
 104         parser.add_option("--chapter", action="store", dest="chapter")
 105         parser.add_option("--startpos", action="store", dest="startpos")
 106         parser.add_option("--endpos", action="store", dest="endpos")
 107         parser.add_option("--audioid", action="store", dest="audioid")
 108         parser.add_option("--profile", action="store", dest="profile_name", default=profile_name)
 109         parser.add_option("--dump", action="store_true", dest="dump")
 110         try:
 111                 opts, (input, output) = parser.parse_args(sys.argv[1:])
 112         except Exception:
 113                 parser.print_usage()
 114                 sys.exit(1)
 115
 116         opts.input = input
 117         opts.output = output
 118         return opts
 119
 120 def run(args, dump):
 121         if dump:
 122                 print "".join(map(commands.mkarg, args))[1:]
 123         else:
 124                 return subprocess.Popen(args).wait()
 125
 126 def main():
 127         opts = parse_args()
 128         try:
 129                 profile = profiles[opts.profile_name]
 130         except KeyError:
 131                 print >>sys.stderr, "Profile '%s' not found!" % profile_name
 132                 sys.exit(1)
 133
 134         cmd = profile.CommandClass(profile, opts)
 135         if run(cmd.pass1(), opts.dump) == 0 or opts.dump:
 136                 run(cmd.pass2(), opts.dump)
 137
 138 if __name__ == "__main__":
 139         main()
 140