enc-mp4

   1 #!/usr/bin/env perl
   2
   3 #=======================================================================
   4 # enc-mp4
   5 # File ID: ccf5e412-f742-11dd-b99b-000475e441b9
   6 # Encode videos for Nokia N95.
   7 #
   8 # Character set: UTF-8
   9 # ©opyleft 2008– Øyvind A. Holm <sunny@sunbase.org>
  10 # License: GNU General Public License version 2 or later, see end of
  11 # file for legal stuff.
  12 #=======================================================================
  13
  14 use strict;
  15 use warnings;
  16 use Getopt::Long;
  17
  18 $| = 1;
  19
  20 our $Debug = 0;
  21
  22 our %Std = (
  23     'encoder' => "ffmpeg",
  24     'frames-per-second' => 15,
  25 );
  26
  27 our %Opt = (
  28
  29     'comment' => "",
  30     'debug' => 0,
  31     'encoder' => $Std{'encoder'},
  32     'force' => 0,
  33     'frames-per-second' => $Std{'frames-per-second'},
  34     'help' => 0,
  35     'output-file' => "",
  36     'verbose' => 0,
  37     'version' => 0,
  38
  39 );
  40
  41 our $progname = $0;
  42 $progname =~ s/^.*\/(.*?)$/$1/;
  43 our $VERSION = "0.00";
  44
  45 Getopt::Long::Configure("bundling");
  46 GetOptions(
  47
  48     "comment|c=s" => \$Opt{'comment'},
  49     "debug" => \$Opt{'debug'},
  50     "encoder|e=s" => \$Opt{'encoder'},
  51     "force|f" => \$Opt{'force'},
  52     "frames-per-second|fps=i" => \$Opt{'frames-per-second'},
  53     "help|h" => \$Opt{'help'},
  54     "output-file|o=s" => \$Opt{'output-file'},
  55     "verbose|v+" => \$Opt{'verbose'},
  56     "version" => \$Opt{'version'},
  57
  58 ) || die("$progname: Option error. Use -h for help.\n");
  59
  60 $Opt{'debug'} && ($Debug = 1);
  61 $Opt{'help'} && usage(0);
  62 if ($Opt{'version'}) {
  63     print_version();
  64     exit(0);
  65 }
  66
  67 if ($#ARGV >= 0) {
  68     for (@ARGV) {
  69         process_file($_);
  70     }
  71 } else {
  72     process_file("-");
  73 }
  74
  75 sub process_file {
  76     # {{{
  77     my $Filename = shift;
  78     D("process_file('$Filename')");
  79     my $use_stdin = ($Filename eq "-") ? 1 : 0;
  80     my $Comment = length($Opt{'comment'})
  81         ? $Opt{'comment'}
  82         : "";
  83     my $Fps = length($Opt{'frames-per-second'})
  84         ? $Opt{'frames-per-second'}
  85         : $Std{'frames-per-second'};
  86     my $output_file = length($Opt{'output-file'})
  87         ? $Opt{'output-file'}
  88         : $use_stdin
  89             ? "-"
  90             : "$Filename.mp4";
  91     if ($use_stdin || -e $Filename) {
  92         if (-e "$Filename.mp4" && !$Opt{'force'}) {
  93             warn("$progname: $Filename.mp4: Will not overwrite existing file. Use --force (-f) option to override.\n");
  94             return;
  95         }
  96         msg(1, "Encoding \"$Filename\" to \"$output_file\"...");
  97         if ($Opt{'encoder'} eq "ffmpeg") {
  98             # Modified version of something found at
  99             # <http://www.n95users.com/forum/general-95/2602-howto-convert-avi-nokia-n95-compatible-avi-embedded-subtitle-linux.html>.
 100             # Does not keep aspect ratio, fills the entire N95 screen,
 101             # but that’s probably better than using 30% of the screen in
 102             # extreme cases.
 103             my @Cmd = (
 104                 "ffmpeg",
 105                 "-i", $Filename,    # Input filename
 106                 "-f", "mp4",        # Format
 107                 "-vcodec", "mpeg4", # Video codec
 108                 "-b", "250000",     # Video bitrate
 109                 "-r", $Fps,         # Frames per second
 110                 "-s", "320x240",    # Frame size
 111                 "-acodec", "aac",   # Audio codec
 112                 "-ar", "44100",     # Audio sampling frequency
 113                 "-ab", "64",        # Audio bitrate in kbit/s
 114                 "-ac", "2",         # Number of audio channels
 115                 "-me", "epzs",      # Motion estimation method (best quality)
 116                 "-y",               # Overwrite output files
 117                 $output_file        # Output filename
 118             );
 119             if (length($Comment)) {
 120                 splice(@Cmd, 1, 0, "-comment", $Comment);
 121             }
 122             mysyst(@Cmd);
 123         } elsif ($Opt{'encoder'} eq "mencoder") {
 124             # Recipe created by Tomasz Sterna, found at
 125             # <http://notes.xiaoka.com/2008/03/29/encode-mp4-files-for-nokia-n95-with-mencoder/>.
 126             # Has sound sync issues.
 127             my @Cmd = (
 128                 "mencoder",
 129                 "-of", "lavf",
 130                 "-lavfopts", "format=mp4",
 131                 "-oac", "lavc",
 132                 "-ovc", "lavc",
 133                 "-lavcopts", "aglobal=1:vglobal=1:acodec=libfaac:abitrate=128:vcodec=mpeg4:keyint=25",
 134                 "-ofps", $Fps,
 135                 "-af", "lavcresample=44100",
 136                 "-vf", "harddup,scale=320:-3",
 137                 "-mc", "0",
 138                 "-noskip",
 139                 $Filename,
 140                 "-o",
 141                 $output_file
 142             );
 143             if (length($Comment)) {
 144                 splice(@Cmd, 1, 0, "-info", "comment=$Comment");
 145             }
 146             mysyst(@Cmd);
 147         } else {
 148             die("$progname: $Opt{'encoder'}: Unknown --encoder value.\n");
 149         }
 150     } else {
 151         warn("$progname: $Filename: File not found");
 152     }
 153     return;
 154     # }}}
 155 } # process_file()
 156
 157 sub mysyst {
 158     # Customised system() {{{
 159     my @Args = @_;
 160     my $system_txt = sprintf("system(\"%s\");", join("\", \"", @Args));
 161     msg(2, "Executing \"" . join(" ", @_) . "\"...");
 162     system(@_);
 163     # }}}
 164 } # mysyst()
 165
 166 sub print_version {
 167     # Print program version {{{
 168     print("$progname v$VERSION\n");
 169     # }}}
 170 } # print_version()
 171
 172 sub usage {
 173     # Send the help message to stdout {{{
 174     my $Retval = shift;
 175
 176     if ($Opt{'verbose'}) {
 177         print("\n");
 178         print_version();
 179     }
 180     print(<<END);
 181
 182 Usage: $progname [options] [file [files [...]]]
 183
 184 Encode movies for the Nokia N95. If no files are specified, the program
 185 encodes from stdin to stdout.
 186
 187 Options:
 188
 189   -c x, --comment x
 190     Use x as comment in the encoded file.
 191   -e x, --encoder x
 192     Use encoder x:
 193       ffmpeg
 194       mencoder (may have audio/video sync problems)
 195     Default: $Std{'encoder'}
 196   --fps x, --frames-per-second x
 197     Generate video with x frames per second.
 198     Default: $Std{'frames-per-second'}.
 199   -h, --help
 200     Show this help.
 201   -f, --force
 202     Overwrite existing files (input filename with .mp4 extension).
 203   -o x, --output-filename x
 204     Use x as output filename.
 205   -v, --verbose
 206     Increase level of verbosity. Can be repeated.
 207   --version
 208     Print version information.
 209   --debug
 210     Print debugging messages.
 211
 212 END
 213     exit($Retval);
 214     # }}}
 215 } # usage()
 216
 217 sub msg {
 218     # Print a status message to stderr based on verbosity level {{{
 219     my ($verbose_level, $Txt) = @_;
 220
 221     if ($Opt{'verbose'} >= $verbose_level) {
 222         print(STDERR "$progname: $Txt\n");
 223     }
 224     # }}}
 225 } # msg()
 226
 227 sub D {
 228     # Print a debugging message {{{
 229     $Debug || return;
 230     my @call_info = caller;
 231     chomp(my $Txt = shift);
 232     my $File = $call_info[1];
 233     $File =~ s#\\#/#g;
 234     $File =~ s#^.*/(.*?)$#$1#;
 235     print(STDERR "$File:$call_info[2] $$ $Txt\n");
 236     return("");
 237     # }}}
 238 } # D()
 239
 240 __END__
 241
 242 # Plain Old Documentation (POD) {{{
 243
 244 =pod
 245
 246 =head1 NAME
 247
 248
 249
 250 =head1 SYNOPSIS
 251
 252  [options] [file [files [...]]]
 253
 254 =head1 DESCRIPTION
 255
 256
 257
 258 =head1 OPTIONS
 259
 260 =over 4
 261
 262 =item B<-h>, B<--help>
 263
 264 Print a brief help summary.
 265
 266 =item B<-v>, B<--verbose>
 267
 268 Increase level of verbosity. Can be repeated.
 269
 270 =item B<--version>
 271
 272 Print version information.
 273
 274 =item B<--debug>
 275
 276 Print debugging messages.
 277
 278 =back
 279
 280 =head1 BUGS
 281
 282
 283
 284 =head1 AUTHOR
 285
 286 Made by Øyvind A. Holm S<E<lt>sunny@sunbase.orgE<gt>>.
 287
 288 =head1 COPYRIGHT
 289
 290 Copyleft © Øyvind A. Holm E<lt>sunny@sunbase.orgE<gt>
 291 This is free software; see the file F<COPYING> for legalese stuff.
 292
 293 =head1 LICENCE
 294
 295 This program is free software: you can redistribute it and/or modify it
 296 under the terms of the GNU General Public License as published by the
 297 Free Software Foundation, either version 2 of the License, or (at your
 298 option) any later version.
 299
 300 This program is distributed in the hope that it will be useful, but
 301 WITHOUT ANY WARRANTY; without even the implied warranty of
 302 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 303 See the GNU General Public License for more details.
 304
 305 You should have received a copy of the GNU General Public License along
 306 with this program.
 307 If not, see L<http://www.gnu.org/licenses/>.
 308
 309 =head1 SEE ALSO
 310
 311 =cut
 312
 313 # }}}
 314
 315 # vim: set fenc=UTF-8 ft=perl fdm=marker ts=4 sw=4 sts=4 et fo+=w :