1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
#!/usr/bin/env perl
# Copyright (c) 2007-2013 Stefano Sabatini
#
# This file is part of FFmpeg.
#
# FFmpeg is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# FFmpeg is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
=head1 NAME
plotframes - Plot video frame sizes using ffprobe and gnuplot
=head1 SYNOPSIS
plotframes [I<options>] [I<input>]
=head1 DESCRIPTION
plotframes reads a multimedia files with ffprobe, and plots the
collected video sizes with gnuplot.
=head1 OPTIONS
=over 4
=item B<--input|-i> I<infile>
Specify multimedia file to read. This is the file passed to the
ffprobe command. If not specified it is the first argument passed to
the script.
=item B<--help|--usage|-h|-?>
Print a brief help message and exit.
=item B<--manpage|-m>
Print the man page.
=item B<--output|-o> I<outfile>
Set the name of the output used by gnuplot. If not specified no output
is created. Must be used in conjunction with the B<terminal> option.
=item B<--stream|--s> I<stream_specifier>
Specify stream. The value must be a string containing a stream
specifier. Default value is "v".
=item B<--terminal|-t> I<terminal>
Set the name of the terminal used by gnuplot. By default it is
"x11". Must be used in conjunction with the B<output> option. Check
the gnuplot manual for the valid values.
=back
=cut
=head1 SEE ALSO
ffprobe(1), gnuplot(1)
=cut
use warnings;
use strict;
use File::Temp;
use JSON -support_by_pp;
use Getopt::Long;
use Pod::Usage;
my $input = $ARGV[0];
my $stream_specifier = "v";
my $gnuplot_terminal = "x11";
my $gnuplot_output;
GetOptions (
'input|i=s' => \$input,
'help|usage|?|h' => sub { pod2usage ( { -verbose => 1, -exitval => 0 }) },
'manpage|m' => sub { pod2usage ( { -verbose => 2, -exitval => 0 }) },
'stream|s=s' => \$stream_specifier,
'terminal|t=s' => \$gnuplot_terminal,
'output|o=s' => \$gnuplot_output,
) or pod2usage( { -message=> "Parsing error", -verbose => 1, -exitval => 1 });
die "You must specify an input file\n" unless $input;
# fetch data
my @cmd = (qw{ffprobe -show_entries frame -select_streams}, $stream_specifier, "-of", "json", $input);
print STDERR "Executing command: @cmd\n";
my $json_struct;
{
open(FH, "-|", @cmd) or die "ffprobe command failed: $!\n";
local $/;
my $json_text = <FH>;
close FH;
die "ffprobe command failed" if $?;
eval { $json_struct = decode_json($json_text); };
die "JSON parsing error: $@\n" if $@;
}
# collect and print frame statistics per pict_type
my %stats;
my $frames = $json_struct->{frames};
my $frame_count = 0;
foreach my $frame (@{$frames}) {
my $type = $frame->{pict_type};
$frame->{count} = $frame_count++;
if (not $stats{$type}) {
$stats{$type}->{tmpfile} = File::Temp->new(SUFFIX => '.dat');
my $fn = $stats{$type}->{tmpfile}->filename;
open($stats{$type}->{fh}, ">", $fn) or die "Can't open $fn";
}
print { $stats{$type}->{fh} }
"$frame->{count} ", $frame->{pkt_size} * 8 / 1000, "\n";
}
foreach (keys %stats) { close $stats{$_}->{fh}; }
# write gnuplot script
my %type_color_map = (
"I" => "red",
"P" => "green",
"B" => "blue"
);
my $gnuplot_script_tmpfile = File::Temp->new(SUFFIX => '.gnuplot');
my $fn = $gnuplot_script_tmpfile->filename;
open(FH, ">", $fn) or die "Couldn't open $fn: $!";
print FH << "EOF";
set title "video frame sizes"
set xlabel "frame time"
set ylabel "frame size (Kbits)"
set grid
set terminal "$gnuplot_terminal"
EOF
print FH "set output \"$gnuplot_output\"\n" if $gnuplot_output;
print FH "plot";
my $sep = "";
foreach my $type (keys %stats) {
my $fn = $stats{$type}->{tmpfile}->filename;
print FH "$sep\"$fn\" title \"$type frames\" with impulses";
print FH " linecolor rgb \"$type_color_map{$type}\"" if $type_color_map{$type};
$sep = ", ";
}
close FH;
# launch gnuplot with the generated script
system ("gnuplot", "--persist", $gnuplot_script_tmpfile->filename);
|
