diff --git a/src/aind_behavior_video_transformation/etl.py b/src/aind_behavior_video_transformation/etl.py
index aef6b7d..f3372b9 100644
--- a/src/aind_behavior_video_transformation/etl.py
+++ b/src/aind_behavior_video_transformation/etl.py
@@ -94,21 +94,21 @@ def _run_compression(
                     for params in convert_video_args
                 ]
                 for job in as_completed(jobs):
-                    out_path, error = job.result()
-                    if error:
-                        error_traces.append(error)
+                    result = job.result()
+                    if isinstance(result, tuple):
+                        error_traces.append(result[1])
                     else:
-                        logging.info(f"FFmpeg job completed: {out_path}")
+                        logging.info(f"FFmpeg job completed: {result}")
         else:
             # Execute serially
             for params in convert_video_args:
-                out_path, error = convert_video(
+                result = convert_video(
                     *params, self.job_settings.ffmpeg_thread_cnt
                 )
-                if error:
-                    error_traces.append(error)
+                if isinstance(result, tuple):
+                    error_traces.append(result[1])
                 else:
-                    logging.info(f"FFmpeg job completed: {out_path}")
+                    logging.info(f"FFmpeg job completed: {result}")
 
         if error_traces:
             for e in error_traces:
diff --git a/src/aind_behavior_video_transformation/transform_videos.py b/src/aind_behavior_video_transformation/transform_videos.py
index df00037..611d917 100644
--- a/src/aind_behavior_video_transformation/transform_videos.py
+++ b/src/aind_behavior_video_transformation/transform_videos.py
@@ -19,7 +19,7 @@
 from os import symlink
 from pathlib import Path
 from subprocess import CalledProcessError
-from typing import Optional, Tuple
+from typing import Optional, Tuple, Union
 
 from pydantic import BaseModel, Field
 
@@ -190,7 +190,7 @@ def convert_video(
     output_dir: Path,
     arg_set: Optional[Tuple[str, str]],
     ffmpeg_thread_cnt: int = 0,
-) -> tuple[str, Optional[str]]:
+) -> Union[str, Tuple[str, str]]:
     """
     Converts a video to a specified format using ffmpeg.
 
@@ -245,7 +245,7 @@ def convert_video(
         subprocess.run(
             ffmpeg_command, check=True, capture_output=True, text=True
         )
-        return (str(out_path), None)
+        return str(out_path)
 
     except CalledProcessError as e:
         error_msg = (