open codec ctx

Author: tbarbugli

getstream/video/rtc/track_util.py

@@ -870,6 +870,7 @@ def _encode_frame_with_codec(self, frame: av.AudioFrame, codec_name: str) -> byt
         codec.sample_rate = frame.sample_rate
         # Set time_base to match sample rate (1/sample_rate)
         codec.time_base = fractions.Fraction(1, frame.sample_rate)
+        codec.open()
 
         # Encode the frame
         packets = codec.encode(frame)