What did you expect to see? Have you noticed that for your sample data all the keys are the same? Is that what you intended?

A useful trick that will help us solve your problem for you is to combine your data and sample code as follows:

use strict;
use warnings;
use open IN  => ':utf8';
use open OUT => ':utf8';
use Encode;

my $str = <<STR;
mv89psg6zh4    A bird in a sink keeps getting under the running water 
+from a faucet.
mv89psg6zh4    A bird is bathing in a sink.
mv89psg6zh4    A bird is splashing around under a running faucet.
mv89psg6zh4    A bird is bathing in a sink.
mv89psg6zh4    A bird is standing in a sink drinking water that is pou
+ring out of the facet.
mv89psg6zh4    A faucet is running while a bird stands in the sink bel
+ow.
mv89psg6zh4    A bird is playing in a sink with running water.
mv89psg6zh5    A bird is playing in tap water.
mv89psg6zh5    A bird is bathing in the sink.
mv89psg6zh5    A bird is taking a bath.
STR

my %hash;

open my $inFile, '<:encoding(utf8)', \$str;
while (<$inFile>) {
    chomp;
    my ($video, $p) = split /\t/;
    push (@{$hash{$video}}, $p);
}

print "$_:\n   ", join ("\n   ", @{$hash{$_}}), "\n" for keys %hash;
[download]

Prints:

mv89psg6zh4:
   A bird in a sink keeps getting under the running water from a fauce
+t.
   A bird is bathing in a sink.
   A bird is splashing around under a running faucet.
   A bird is bathing in a sink.
   A bird is standing in a sink drinking water that is pouring out of 
+the facet.
   A faucet is running while a bird stands in the sink below.
   A bird is playing in a sink with running water.
mv89psg6zh5:
   A bird is playing in tap water.
   A bird is bathing in the sink.
   A bird is taking a bath.
[download]

Note that I've altered some of the keys.

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