after_build_tx => sub {
  my ($tx, $app) = @_;

  $tx->once('chunk'=>sub {
    my ($tx, $chunk) = @_;
    my $url = $tx->req->url->to_abs;
    my $feed = $url->path->to_route;

    return 
      unless $url->path->to_route =~ /ffmpeg/
        and $tx->req->method eq 'POST';
    $feed = $app->feeds->{$feed} = {tx=>$tx, clients=>{}};

    $tx->req->max_message_size(0);

    $tx->req->content->asset->on(upgrade => sub {
      my ($mem, $file) = @_;
      $file->handle->close;
      $file->handle(IO::File->new("> /dev/null"));
    });
    
    $tx->on('chunk'=>sub {
      my ($tx, $chunk) = @_;
      $_->tx->send({binary => $chunk})
        for (values %{$feed->{clients}});
    });
  });
},