diff --git a/streaming/multi_res_output.py b/streaming/multi_res_output.py
index 142e8bf..f5d3111 100644
--- a/streaming/multi_res_output.py
+++ b/streaming/multi_res_output.py
@@ -192,6 +192,8 @@ class MultiResolutionHLSOutput:
         # Add audio input if provided
         if self.audio_source:
             cmd.extend(["-i", str(self.audio_source)])
+            # Map video from input 0, audio from input 1
+            cmd.extend(["-map", "0:v", "-map", "1:a"])
 
         # Scale if not original resolution
         if quality.width != self.source_width or quality.height != self.source_height: