You need to change the video resolution. The current resolution is (640x480), which is not supported for this configuration. The expected video resolution is (1280x720).
Please use a keyframe frequency of four seconds or less. Currently, keyframes are not being sent often enough, which will cause buffering. The current keyframe frequency is 6.0 seconds. Note that ingestion errors can cause incorrect GOP (group of pictures) sizes.
YouTube is not receiving enough video to maintain smooth streaming. As such, viewers will experience buffering.
The stream's current bitrate (168.00 Kbps) is lower than the recommended bitrate. We recommend that you use a stream bitrate of 2500 Kbps.
The audio stream's current bitrate (0) is lower than the recommended bitrate. We recommend that you use an audio stream bitrate of 128 Kbps.