AudioFrameHeaderFrameLengthInBytes Property

length of this frame in bytes; different for every frame bitrate calculation includes the standard header bytes of normal audio frames already returns null for 'free' bitrate files because parsing the audio coefficients to work out how long it should be is too much work. If you want to know how long the frame is, ask the audio stream, not the header.

public uint? FrameLengthInBytes { get; }