submodule对gitea不管用，所以直接拉了一份拉格兰

Lagrange.Core/Lagrange.OneBot/Message/Entity/VideoSegment.cs

@@ -0,0 +1,34 @@
+using System.Text.Json.Serialization;
+using Lagrange.Core.Message;
+using Lagrange.Core.Message.Entity;
+
+namespace Lagrange.OneBot.Message.Entity;
+
+[Serializable]
+public partial class VideoSegment(string url)
+{
+    public VideoSegment() : this("") { }
+
+    [JsonPropertyName("file")] [CQProperty] public string File { get; set; } = url;
+    
+    [JsonPropertyName("url")] public string Url { get; set; }  = url;
+}
+
+[SegmentSubscriber(typeof(VideoEntity), "video")]
+public partial class VideoSegment : SegmentBase
+{
+    public override void Build(MessageBuilder builder, SegmentBase segment)
+    {
+        if (segment is VideoSegment videoSegment and not { File: "" } && CommonResolver.Resolve(videoSegment.File) is { } image)
+        {
+            builder.Video(image);
+        }
+    }
+
+    public override SegmentBase FromEntity(MessageChain chain, IMessageEntity entity)
+    {
+        if (entity is not VideoEntity videoEntity) throw new ArgumentException("Invalid entity type.");
+
+        return new RecordSegment(videoEntity.VideoUrl);
+    }
+}