How are you encoding and decoding the information?
It is a mathematical way of encoding or combining the different sources such as video, audio, and subtitles together.
Then, it is the process of decoding that information on the receiver to display the video, play the audio, and show the subtitles correctly.
Without Codec, what would happen?
There are two Codec options used by Agora:
VP8: Standard for all current browsers or apps. Set to default
H264 (h.264): Supported for older versions of Apple Safari (version 12.1 or earlier).