Extract audio clip from VideoPlayer for real-time processing

I have a VideoPlayer component which plays a video from a designated URL with its audio output mode set to AudioSource. I also have a script which reads an audio clip from an Audio Source and logs to the console whenever it detects a 'beat'. This AudioProcessor script works fine when I manually place an audio clip into my AudioSource, but fails when attempting to read the audio from a VideoPlayer.

I have a helper script which creates a clip and places it into the AudioSource.

 using UnityEngine;
 
 [RequireComponent(typeof(AudioSource))]
 public class FindAudioClip : MonoBehaviour
 {
     void Awake()
     {
         AudioSource audioSource = GetComponent<AudioSource>();
         var samplesLength = AudioSettings.outputSampleRate;
 
         audioSource.clip = AudioClip.Create("", samplesLength, 2, AudioSettings.outputSampleRate, true, null);
         audioSource.loop = false;
         audioSource.Play();
     }
 }

However, the audio clip it places into my Audio Source appears to be devoid of any sort of data. My AudioProcessor identifies that a clip is playing but does not register any beats.

For reference, here is my basic video player script which plays a video from a URL.

 IEnumerator playVideoURL()
     {
         videoPlayer = gameObject.GetComponent<VideoPlayer>();
         audioSource = gameObject.GetComponent<AudioSource>();
 
         videoPlayer.playOnAwake = false;
         audioSource.playOnAwake = false;
         audioSource.Pause();
 
         videoPlayer.source = VideoSource.Url;
         Debug.Log(videoURL);
         videoPlayer.url = videoURL;
 
         videoPlayer.audioOutputMode = VideoAudioOutputMode.AudioSource;
         videoPlayer.EnableAudioTrack(0, true);
         videoPlayer.SetTargetAudioSource(0, audioSource);
 
         videoPlayer.controlledAudioTrackCount = 1;
         videoPlayer.Prepare();
 
         while (!videoPlayer.isPrepared)
         {
             yield return null;
         }
 
         image.texture = videoPlayer.texture;
 
         videoPlayer.Play();
         audioSource.Play();
 
         AudioProcessor.audioReady = true;
     }