A slightly different YouTube issue: Misnamed DASH audio.

[CuF]

This video (https://www.youtube.com/watch?v=rAbAd4QBL1s) has a maximum resolution of 480p (large). The best muxed version FlashGot sees is medium.

Going to the DASH downloads, the large 480p video is available, but no matching audio track. The medium audio is available though.

BUT...
The audio track muxed to the medium mp4 version is 96kbps / 23.9mb.
The DASH medium m4a stream is 126kbps / 31.5mb.

It looks like the audio-only claiming to be medium is probably large's audio. Hope you can fix this.