Fix HLS audio duration to match video with -shortest flag

HLS outputs were including full audio track instead of trimming
to match video duration, causing video to freeze while audio
continued playing.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

streaming/output.py

@@ -548,7 +548,7 @@ class HLSOutput(Output):
 
         # Add audio codec if we have audio
         if audio_source:
-            cmd.extend(["-c:a", "aac", "-b:a", "128k"])
+            cmd.extend(["-c:a", "aac", "-b:a", "128k", "-shortest"])
 
         # HLS specific options for smooth live streaming
         cmd.extend([
@@ -704,7 +704,7 @@ class IPFSHLSOutput(Output):
 
         # Add audio codec if we have audio
         if audio_source:
-            cmd.extend(["-c:a", "aac", "-b:a", "128k"])
+            cmd.extend(["-c:a", "aac", "-b:a", "128k", "-shortest"])
 
         # HLS options
         cmd.extend([