Why can't I hear a high-frequency sound when I play a YouTube video? For example, if you upload a 19khz high frequency to YouTube and play the iPhone , the high frequency will not come out. Why do you cut high-mainstreamers on YouTube?


YouTube uses 128 kbit/s AAC custom encoder for most videos, which they ran a blind study on and found it indistinguishable from 320 kbit/s MP3. However, this study involved mostly university students, and those were too old to hear these high frequencies, so that it cuts off high frequencies went undetected. However:

Opus, which is used for most playbacks on the web and will soon be used on Android, does not have this problem.

Steven Robertson, March 2018

| improve this answer | |
  • My question is, it works properly on web and Android YouTube app. However, frequencies above 17 khz are not played on the iPhone alone. I wonder why you stop the high-mainstream faction on YouTube. – 정재엽 Sep 28 at 1:17

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.