[waigy]

Here's the audio details of the downloaded clips (my 1 minute long test vid)

240p :
Format : MPEG Audio
Format version : Version 2
Format profile : Layer 3
Mode : Joint stereo
Mode extension : MS Stereo
Bit rate mode : Constant
Bit rate : 8 000 bps
Channel(s) : 2 channels
Sampling rate : 22.05 KHz
Bit depth : 16 bits
Stream size : 61.5 KiB (3%)

360p :
Format : AAC
Format version : Version 4
Format profile : LC
Format settings, SBR : Yes
Format settings, PS : No
Bit rate : 54.1 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 44.1 KHz
Bit depth : 16 bits
Stream size : 416 KiB (11%)

480p :
Format : AAC
Format version : Version 4
Format profile : LC
Format settings, SBR : No
Bit rate : 96.7 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 44.1 KHz
Bit depth : 16 bits
Stream size : 744 KiB (11%)

720p :
ID : 2
Format : AAC
Format version : Version 4
Format profile : LC
Format settings, SBR : No
Codec ID : 40
Bit rate mode : Variable
Bit rate : 128 Kbps
Maximum bit rate : 199 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 44.1 KHz
Stream size : 983 KiB (6%)


1080p :
ID : 2
Format : AAC
Format version : Version 4
Format profile : LC
Format settings, SBR : No
Codec ID : 40
Bit rate mode : Variable
Bit rate : 128 Kbps
Maximum bit rate : 199 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 44.1 KHz
Stream size : 983 KiB (10%)


I don't have much experience with aac, I gather the same bitrate in aac is higher quality than the same bitrate in mp3.
I reckon the equivalent of 128 kbps mp3 sound would be ok for me (preferably higher), but going lower than that really hits the high frequency detail.

Also looking at the stream size percentage, if I decrease the bitrate of my video before upload, will youtube give a higher percentage to the audio?
It mentions a maximum bitrate of 199 kbps (720p & 1080p), should I try reducing my video bitrate till I acheive 199 kbps?