Here is one way to get the size and bitrate of a video using ffmpeg:
my $file = $ARGV;
die "usage: arg1 must be a video file\n" unless $file;
my $string = shift;
$string =~ s/^\s+//;
$string =~ s/\s+$//;
open (FILE, "ffmpeg -i \"$file\" 2>&1 |");
my $line = $_;
next unless ($line =~ m/^\s+Stream #.+?: Video/);
my @pieces = split (',', $line);
my @vsize = split (' ', trim ($pieces));
my @vbits = split (' ', trim ($pieces));
my $video_size = trim (shift @vsize);
my $video_bits = trim (shift @vbits);
print "$video_size $video_bits\n";
Output: 854x480 537
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