diff --git a/seplis_play_server/transcoders/hls.py b/seplis_play_server/transcoders/hls.py
index c9f7103..c6ef052 100644
--- a/seplis_play_server/transcoders/hls.py
+++ b/seplis_play_server/transcoders/hls.py
@@ -18,6 +18,10 @@ def __init__(self, settings: video.Transcode_settings, metadata: dict):
         settings.transcode_video_codec = 'h264'
         # Still issues with hevc
         settings.supported_video_codecs = ['h264',]
+        if settings.format == 'hls.js':
+            # Find out if hls.js supports other that aac, e.g. eac3 doesn't work
+            settings.supported_audio_codecs = ['aac',]
+            settings.transcode_audio_codec = 'aac'
         super().__init__(settings, metadata)
     
     def ffmpeg_extend_args(self) -> None:
diff --git a/seplis_play_server/transcoders/video.py b/seplis_play_server/transcoders/video.py
index b4ad53b..e04baf1 100644
--- a/seplis_play_server/transcoders/video.py
+++ b/seplis_play_server/transcoders/video.py
@@ -15,7 +15,7 @@ class Transcode_settings:
     source_index: int
     supported_video_codecs: Annotated[list[constr(min_length=1)], Query()]
     supported_audio_codecs: Annotated[list[constr(min_length=1)], Query()]
-    format: Literal['pipe', 'hls', 'dash']
+    format: Literal['pipe', 'hls', 'hls.js', 'dash']
     transcode_video_codec: Literal['h264', 'hevc', 'vp9']
     transcode_audio_codec: Literal['aac', 'opus', 'dts', 'flac', 'mp3']
 
@@ -243,7 +243,7 @@ def set_video(self):
             self.ffmpeg_args.extend([
                 {'-start_at_zero': None},
                 {'-avoid_negative_ts': 'disabled'},
-                #{'-copyts': None},
+                {'-copyts': None},
             ])
         else:
             if config.ffmpeg_hwaccel_enabled: