VRC_SyncVideoPlayer updater script that runs in Unity. Currently very tied to loading my own database from YAML and updating a video player and a separate component with a list of videos in it, but modify as you wish.

VideoUpdater.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.SceneManagement;
using UnityEngine.Video;
using VRCSDK2;
using YamlDotNet.RepresentationModel;


public class VideoUpdater : MonoBehaviour
{
    public VRC_SyncVideoPlayer VideoPlayer;
    public GameObject RemoteControlVideoList;
    public GameObject ListEntryPrefab;

    void Start ()
    {
    }
    
    void Update ()
    {
    }
 
    public void UpdateVideos()
    {
        clearVideoPlayer();
        clearSongList();

        var entries = loadDatabase();
        addToVideoPlayer(entries);

        foreach (DatabaseEntry entry in entries)
        {
            addToSongList(entry);
        }
    }

    void clearVideoPlayer()
    {
        VideoPlayer.Videos = new VRC_SyncVideoPlayer.VideoEntry[0];
    }

    void addToVideoPlayer(List<DatabaseEntry> entries)
    {
        var videoEntries = new List<VRC_SyncVideoPlayer.VideoEntry>(entries.Count);

        foreach (DatabaseEntry entry in entries)
        {
            var videoEntry = new VRC_SyncVideoPlayer.VideoEntry();
            videoEntry.URL = entry.MyURL;
            videoEntry.AspectRatio = VideoAspectRatio.FitInside;
            videoEntries.Add(videoEntry);
        }

        VideoPlayer.Videos = videoEntries.ToArray();
    }

    void clearSongList()
    {
        // Two passes because Transform's foreach is dodgy.
        List<GameObject> toDestroy = new List<GameObject>();
        foreach (Transform child in RemoteControlVideoList.transform)
        {
            toDestroy.Add(child.gameObject);
        }
        foreach (GameObject gameObject in toDestroy)
        {
            GameObject.DestroyImmediate(gameObject);
        }

        RectTransform listRectTransform = (RectTransform) RemoteControlVideoList.transform;
        listRectTransform.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, 0);
    }

    void addToSongList(DatabaseEntry entry)
    {
        RectTransform listRectTransform = (RectTransform) RemoteControlVideoList.transform;
        Rect listRect = listRectTransform.rect;

        GameObject newChild = Instantiate(ListEntryPrefab, listRectTransform);
        RectTransform newChildTransform = (RectTransform) newChild.transform;
        float listHeight = listRect.height;

        Vector3 newChildPosition = newChildTransform.localPosition;
        newChildPosition.y = -listHeight;
        newChildTransform.localPosition = newChildPosition;

        Text newChildText = (Text) newChild.GetComponentInChildren(typeof(Text));
        newChildText.text = entry.Name;

        float entryHeight = newChildTransform.rect.height;
        listRectTransform.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, listHeight + entryHeight);
    }

    List<DatabaseEntry> loadDatabase()
    {
        string file = Path.Combine(getHomeFolder(), "Google Drive/Lamaze/lamazedb.yml");
        YamlSequenceNode entries;
        using (StreamReader input = new StreamReader(file))  //todo wrong file
        {
            var yaml = new YamlStream();
            yaml.Load(input);
            entries = (YamlSequenceNode) yaml.Documents[0].RootNode;
        }

        List<DatabaseEntry> results = new List<DatabaseEntry>();
        foreach (YamlNode untypedEntry in entries)
        {
            IDictionary<YamlNode, YamlNode> yamlEntry = ((YamlMappingNode) untypedEntry).Children;
            DatabaseEntry entry = new DatabaseEntry();

            if (yamlEntry.ContainsKey(new YamlScalarNode("DISABLED")) &&
                ((YamlScalarNode) yamlEntry[new YamlScalarNode("DISABLED")]).Value == "true")
            {
                continue;
            }

            entry.Name = ((YamlScalarNode) yamlEntry[new YamlScalarNode("name")]).Value;

            if (yamlEntry.ContainsKey(new YamlScalarNode("my_url")))
            {
                entry.MyURL = ((YamlScalarNode) yamlEntry[new YamlScalarNode("my_url")]).Value;
            }
            else
            {
                continue;
            }

            results.Add(entry);
        }
        return results;
    }

    string getHomeFolder()
    {
        return (Environment.OSVersion.Platform == PlatformID.Unix || 
                Environment.OSVersion.Platform == PlatformID.MacOSX)
            ? Environment.GetEnvironmentVariable("HOME")
            : Environment.ExpandEnvironmentVariables("%HOMEDRIVE%%HOMEPATH%");
    }

    class DatabaseEntry
    {
        public string Name { get; set; }
        public string MyURL { get; set; }
    }
}

VideoUpdaterEditor.cs

using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;

[CustomEditor(typeof(VideoUpdater))]
public class VideoUpdaterEditor : Editor
{
	public override void OnInspectorGUI()
	{
		DrawDefaultInspector();

		VideoUpdater script = (VideoUpdater) target;
		if (GUILayout.Button("Update Videos"))
		{
			script.UpdateVideos();
		}
	}
}