165 lines
4.5 KiB
Perl
Executable File
165 lines
4.5 KiB
Perl
Executable File
#!/usr/bin/env perl
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# Copyright (c) 2007-2013 Stefano Sabatini
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#
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# This file is part of FFmpeg.
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#
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# FFmpeg is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# FFmpeg is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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=head1 NAME
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plotframes - Plot video frame sizes using ffprobe and gnuplot
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=head1 SYNOPSIS
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plotframes [I<options>] [I<input>]
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=head1 DESCRIPTION
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plotframes reads a multimedia files with ffprobe, and plots the
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collected video sizes with gnuplot.
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=head1 OPTIONS
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=over 4
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=item B<--input|-i> I<infile>
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Specify multimedia file to read. This is the file passed to the
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ffprobe command. If not specified it is the first argument passed to
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the script.
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=item B<--help|--usage|-h|-?>
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Print a brief help message and exit.
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=item B<--manpage|-m>
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Print the man page.
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=item B<--output|-o> I<outfile>
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Set the name of the output used by gnuplot. If not specified no output
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is created. Must be used in conjunction with the B<terminal> option.
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=item B<--stream|--s> I<stream_specifier>
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Specify stream. The value must be a string containing a stream
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specifier. Default value is "v".
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=item B<--terminal|-t> I<terminal>
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Set the name of the terminal used by gnuplot. By default it is
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"x11". Must be used in conjunction with the B<output> option. Check
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the gnuplot manual for the valid values.
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=back
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=cut
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=head1 SEE ALSO
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ffprobe(1), gnuplot(1)
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=cut
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use warnings;
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use strict;
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use File::Temp;
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use JSON -support_by_pp;
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use Getopt::Long;
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use Pod::Usage;
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my $input = $ARGV[0];
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my $stream_specifier = "v";
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my $gnuplot_terminal = "x11";
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my $gnuplot_output;
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GetOptions (
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'input|i=s' => \$input,
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'help|usage|?|h' => sub { pod2usage ( { -verbose => 1, -exitval => 0 }) },
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'manpage|m' => sub { pod2usage ( { -verbose => 2, -exitval => 0 }) },
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'stream|s=s' => \$stream_specifier,
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'terminal|t=s' => \$gnuplot_terminal,
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'output|o=s' => \$gnuplot_output,
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) or pod2usage( { -message=> "Parsing error", -verbose => 1, -exitval => 1 });
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die "You must specify an input file\n" unless $input;
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# fetch data
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my @cmd = (qw{ffprobe -show_entries frame -select_streams}, $stream_specifier, "-of", "json", $input);
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print STDERR "Executing command: @cmd\n";
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my $json_struct;
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{
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open(FH, "-|", @cmd) or die "ffprobe command failed: $!\n";
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local $/;
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my $json_text = <FH>;
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close FH;
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die "ffprobe command failed" if $?;
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eval { $json_struct = decode_json($json_text); };
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die "JSON parsing error: $@\n" if $@;
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}
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# collect and print frame statistics per pict_type
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my %stats;
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my $frames = $json_struct->{frames};
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my $frame_count = 0;
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foreach my $frame (@{$frames}) {
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my $type = $frame->{pict_type};
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$frame->{count} = $frame_count++;
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if (not $stats{$type}) {
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$stats{$type}->{tmpfile} = File::Temp->new(SUFFIX => '.dat');
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my $fn = $stats{$type}->{tmpfile}->filename;
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open($stats{$type}->{fh}, ">", $fn) or die "Can't open $fn";
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}
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print { $stats{$type}->{fh} }
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"$frame->{count} ", $frame->{pkt_size} * 8 / 1000, "\n";
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}
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foreach (keys %stats) { close $stats{$_}->{fh}; }
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# write gnuplot script
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my %type_color_map = (
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"I" => "red",
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"P" => "green",
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"B" => "blue"
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);
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my $gnuplot_script_tmpfile = File::Temp->new(SUFFIX => '.gnuplot');
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my $fn = $gnuplot_script_tmpfile->filename;
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open(FH, ">", $fn) or die "Couldn't open $fn: $!";
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print FH << "EOF";
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set title "video frame sizes"
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set xlabel "frame time"
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set ylabel "frame size (Kbits)"
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set grid
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set terminal "$gnuplot_terminal"
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EOF
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print FH "set output \"$gnuplot_output\"\n" if $gnuplot_output;
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print FH "plot";
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my $sep = "";
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foreach my $type (keys %stats) {
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my $fn = $stats{$type}->{tmpfile}->filename;
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print FH "$sep\"$fn\" title \"$type frames\" with impulses";
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print FH " linecolor rgb \"$type_color_map{$type}\"" if $type_color_map{$type};
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$sep = ", ";
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}
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close FH;
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# launch gnuplot with the generated script
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system ("gnuplot", "--persist", $gnuplot_script_tmpfile->filename);
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