short Unity C# script example for smoothly cutting / playing a playllist of VideoClips, by using one VideoPlayer (activeCam) to play the video and another VideoPlayer (otherCam) to cue up the next video... MIT License.

SmoothVideoPlaylist.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Video;

public class SmoothVideoPlaylist : MonoBehaviour {
  	// to smoothly cut between two videos, we need two VideoPlayers
  	// make sure you create two VideoPlayers and assign them in the Inspector
	public VideoPlayer activeCam, otherCam;
  
  	// edit this in the inspector, and fill it with your video clips
  	public List<VideoClip> playlist = new List<VideoClip>();
  
  	// internal var, keeps track of whether there's another clip cued up
	VideoClip nextClip;

	void Start () {
    		// play the first video in the playlist
		PrepareNextPlaylistClip();
		SwitchCams(activeCam);

    		// setup an event to automatically call SwitchCams() when we finish playing
		activeCam.loopPointReached += SwitchCams;
		otherCam.loopPointReached += SwitchCams;
	}
	
	void Update () {
    		// when the current video is 0.1 seconds away from ending, prepare the next video clip on otherCam
		if ( nextClip == null && activeCam.time >= activeCam.clip.length-0.1 ) {
			PrepareNextPlaylistClip();
		}

		// FAST FORWARD CHEAT, hold down F to speed-up video
		if ( Input.GetKey(KeyCode.F) ) {
			Time.timeScale = 16f;
			activeCam.playbackSpeed = 16f;
			otherCam.playbackSpeed = 16f;
		} else {
			Time.timeScale = 1f;
			activeCam.playbackSpeed = 1f;
			otherCam.playbackSpeed = 1f;
		}

	}

  	// swaps the VideoPlayer references, so activeCam is always the active VideoPlayer
	void SwitchCams (VideoPlayer thisCam) {
		activeCam = otherCam;
		otherCam = thisCam;
		activeCam.targetCameraAlpha = 1f;
     		otherCam.targetCameraAlpha = 0f;
    
		Debug.Log("new clip: " + nextClip.name );
		nextClip = null;
	}

  	// cues up the next video clip in the playlist
	void PrepareNextPlaylistClip () {
		nextClip = playlist[0];
		otherCam.clip = nextClip;
		otherCam.Play();
		playlist.RemoveAt(0);
	}

}

This works beautifully. I wondered, how do I click on an UI button to go to next clip or go back to previous clip as listed in the inspector?