How to stream an large file from S3 to a laravel view

I have this mostly working but having a tough time finalizing it.

For now I have a simple route:

Route::get('file/{id}/', 'FileController@fileStream')->name('file');

this route connects to an action in the FileController:

public function fileStream($id){

    $audio = \App\Audio::where('id', $id)->first();

    $client = S3Client::factory([
        'credentials' => [
            'key'    => env('AWS_ACCESS_KEY_ID'),
            'secret' => env('AWS_SECRET_ACCESS_KEY'),
        ],
        'region' => env('S3REGION'),
        'version' => 'latest',
    ]);


    // Register the stream wrapper from an S3Client object
    $client->registerStreamWrapper();

    if ($stream = fopen('s3://[bucket_name]/'. $audio->audio_url, 'r')) {
        while (!feof($stream)) {
            echo fread($stream, 1024);
        }
        fclose($stream);
    }    
}

This works to the browser: if I go to a url: /file/1 it looks up the right file, and in a clean browser window I get:

And then in my view I am trying to output the audio like:

   <audio>
      <source src="" type=""></audio>
   </audio>

But no player is getting output to the screen.

TIA

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