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

   1 #!/usr/bin/env python
   2
   3 import commands, optparse, subprocess, sys, os
   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 is not None:
  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("-sid", self.opts.subtitleid)
  29                 tryOpt("-vf", self.opts.vfilters)
  30                 tryOpt("-af", self.opts.afilters)
  31                 if self.opts.deinterlace:
  32                         cmd += ["-vf-add", "pp=ci"]
  33
  34         def substValues(self, cmd):
  35                 subst = {
  36                         "vbitrate": self.opts.vbitrate,
  37                         "abitrate": self.opts.abitrate,
  38                         "input": self.opts.input,
  39                         "output": self.opts.output,
  40                 }
  41
  42                 return [x % subst for x in cmd]
  43
  44         def pass1(self):
  45                 p = self.profile
  46                 cmd = []
  47                 cmd += ["mencoder", "%(input)s", "-o", "/dev/null"]
  48                 self.insertOptions(cmd)
  49                 cmd += ["-ovc", p.vcodec, self.codec2opts[p.vcodec], "pass=1:"+p.vopts]
  50                 cmd += ["-oac", "copy"]
  51                 cmd = self.substValues(cmd)
  52                 return cmd
  53
  54         def pass2(self):
  55                 p = self.profile
  56                 cmd = []
  57                 cmd += ["mencoder", "%(input)s", "-o", "%(output)s"]
  58                 self.insertOptions(cmd)
  59                 cmd += ["-ovc", p.vcodec, self.codec2opts[p.vcodec], "pass=2:"+p.vopts]
  60                 cmd += ["-oac", p.acodec, self.codec2opts[p.acodec], p.aopts]
  61                 cmd += self.profile.extra
  62                 cmd = self.substValues(cmd)
  63                 return cmd
  64
  65 class Profile(object):
  66         def __init__(self, CommandClass, **kwargs):
  67                 self.CommandClass = CommandClass
  68                 self.__dict__.update(kwargs)
  69
  70 profiles = {
  71         "qt7" :
  72         Profile(
  73                 CommandClass=MencoderCommand,
  74                 vcodec="x264",
  75                 vopts="bitrate=%(vbitrate)d:me=umh:partitions=all:trellis=1:subq=7:bframes=1:direct_pred=auto",
  76                 acodec="faac",
  77                 aopts="br=%(abitrate)d:mpeg=4:object=2",
  78         ),
  79
  80         "xvid" :
  81         Profile(
  82                 CommandClass=MencoderCommand,
  83                 vcodec="xvid",
  84                 vopts="bitrate=%(vbitrate)d:vhq=4:autoaspect",
  85                 acodec="mp3lame",
  86                 aopts="abr:br=%(abitrate)d",
  87                 extra=["-ffourcc", "DX50"],
  88         ),
  89         "ipodxvid" :
  90         Profile(
  91                 CommandClass=MencoderCommand,
  92                 vcodec="xvid",
  93                 vopts="bitrate=%(vbitrate)d:vhq=4:autoaspect:max_bframes=0",
  94                 acodec="faac",
  95                 aopts="br=%(abitrate)d:mpeg=4:object=2",
  96         ),
  97 }
  98
  99
 100
 101
 102 def parse_args():
 103         for profile_name in profiles.keys():
 104                 if sys.argv[0].find(profile_name) >= 0:
 105                         break
 106         else:
 107                 profile_name = "xvid"
 108
 109         parser = optparse.OptionParser(usage="%prog [options] input output")
 110         parser.add_option("--dvd", action="store", dest="dvd")
 111         parser.add_option("--deinterlace", action="store_true", dest="deinterlace")
 112         parser.add_option("--vfilters", action="store", dest="vfilters")
 113         parser.add_option("--afilters", action="store", dest="afilters")
 114         parser.add_option("--vbitrate", action="store", dest="vbitrate", type="int", default=1000)
 115         parser.add_option("--abitrate", action="store", dest="abitrate", type="int", default=192)
 116         parser.add_option("--chapter", action="store", dest="chapter")
 117         parser.add_option("--startpos", action="store", dest="startpos")
 118         parser.add_option("--endpos", action="store", dest="endpos")
 119         parser.add_option("--audioid", action="store", dest="audioid")
 120         parser.add_option("--subtitleid", action="store", dest="subtitleid")
 121         parser.add_option("--profile", action="store", dest="profile_name", default=profile_name)
 122         parser.add_option("--dump", action="store_true", dest="dump")
 123         try:
 124                 opts, (input, output) = parser.parse_args(sys.argv[1:])
 125         except Exception:
 126                 parser.print_usage()
 127                 sys.exit(1)
 128
 129         opts.input = input
 130         opts.output = output
 131         return opts
 132
 133 def run(args, dump):
 134         if dump:
 135                 print "".join(map(commands.mkarg, args))[1:]
 136         else:
 137                 return subprocess.Popen(args).wait()
 138
 139 def main():
 140         opts = parse_args()
 141         try:
 142                 profile = profiles[opts.profile_name]
 143         except KeyError:
 144                 print >>sys.stderr, "Profile '%s' not found!" % profile_name
 145                 sys.exit(1)
 146
 147         cmd = profile.CommandClass(profile, opts)
 148         if run(cmd.pass1(), opts.dump) == 0 or opts.dump:
 149                 run(cmd.pass2(), opts.dump)
 150
 151 if __name__ == "__main__":
 152         main()
 153