Breaking news (for me), for some reasons I can no longer download 720p with 192 kbps audio.
The first four images are from Forever and Sending SOS. The last two are from my last two uploads, somehow one is fine while the other one got compressed a lot. The old Forever and Sending SOS m4a were downloaded in 7/2014, downloaded 720p mp4 (with youtube-dl) then extracted losslessly (with Maruki Toolbox). I even tried --all-formats in youtube-dl to download a better version of the 'new' audio, yet the best is only 126 kbps from 720p or webm, both worse than the old m4a from old 720p.
OR it's just I (keepvid.com and youtube-dl) can't access to the 192 kbps audio for me to download while a normal user can access to it in a browser.