diff --git a/workflow/video.py b/workflow/video.py
index 561acda..bf6af83 100644
--- a/workflow/video.py
+++ b/workflow/video.py
@@ -83,7 +83,8 @@ def get_encode_process_use_vaapi(orig_filename: str, subtitles: list[str], new_f
     encode_process = subprocess.Popen([
         FFMPEG_EXEC, *_common_ffmpeg_setting(),
         "-hwaccel", "vaapi", "-hwaccel_output_format", "vaapi", "-i", orig_filename, "-vf",
-        ",".join("subtitles=%s" % i for i in subtitles),
+        "hwmap=mode=read+write+direct,format=nv12," + 
+        "".join("subtitles=%s," % i for i in subtitles) + "hwmap",
         "-c:v", "h264_vaapi",
         *_common_ffmpeg_params(),
         # "-t", "10",
@@ -111,7 +112,7 @@ def get_encode_hevc_process_use_nvenc(orig_filename: str, subtitles: list[str],
     encode_process = subprocess.Popen([
         FFMPEG_EXEC, *_common_ffmpeg_setting(),
         "-i", orig_filename, "-vf",
-        ",".join("subtitles=%s" % i for i in subtitles) + ",hwupload_cuda",
+        "".join("subtitles=%s," % i for i in subtitles) + ",hwupload_cuda",
         "-c:v", "hevc_nvenc",
         *_common_ffmpeg_params(),
         # "-t", "10",
@@ -125,7 +126,8 @@ def get_encode_hevc_process_use_vaapi(orig_filename: str, subtitles: list[str],
     encode_process = subprocess.Popen([
         FFMPEG_EXEC, *_common_ffmpeg_setting(),
         "-hwaccel", "vaapi", "-hwaccel_output_format", "vaapi", "-i", orig_filename, "-vf",
-        ",".join("subtitles=%s" % i for i in subtitles),
+        "hwmap=mode=read+write+direct,format=nv12," + 
+        "".join("subtitles=%s," % i for i in subtitles) + "hwmap",
         "-c:v", "hevc_vaapi",
         *_common_ffmpeg_params(),
         # "-t", "10",