diff --git a/packages/ffmpeg/src/classes.ts b/packages/ffmpeg/src/classes.ts
index 05ab730..8dd50e2 100644
--- a/packages/ffmpeg/src/classes.ts
+++ b/packages/ffmpeg/src/classes.ts
@@ -123,6 +123,8 @@ export class FFmpeg {
    *
    * @category FFmpeg
    */
+  public on(event: "log", callback: LogEventCallback): void;
+  public on(event: "progress", callback: ProgressEventCallback): void;
   public on(
     event: "log" | "progress",
     callback: LogEventCallback | ProgressEventCallback
@@ -139,6 +141,8 @@ export class FFmpeg {
    *
    * @category FFmpeg
    */
+  public off(event: "log", callback: LogEventCallback): void;
+  public off(event: "progress", callback: ProgressEventCallback): void;
   public off(
     event: "log" | "progress",
     callback: LogEventCallback | ProgressEventCallback