I was encoding with VBR native FFMPEG's AAC encoder i.e using `-q:a.` https://trac.ffmpeg.org/wiki/Encode/AAC The above page says that effective range for -q:a is `0.1 to 2.0.` But, I tried to encode with `-q:a 5.0` and FFMPEG didn't gave any error for encoding the audio. I was suprised! And I got around 300kbps with `-q:a 5.0` So, what is the true effective range for VBR encoding i.e for -q:a with FFMPEG's Native AAC encoder ?