emilemil1 wrote:No because streaming uses DASH audio and video, which for audio is the 160kbps stream. The 720p stream you're downloading is normally never seen by anyone unless DASH breaks.
As emil mentioned, YouTube capped the audio bit rate to 160 kbps around a year ago. However, I got a way to keep it 192 kbps and the result is very promising.
It is done by encoding the audio with qaac 2.61 in Maruko Toolbox. Maruko Toolbox comes with qaac 2.44 so download latest qaac from here. You only have to download qaac-x.xx.zip. Then extract the files inside x86 and x64 to MarukoToolbox\tools and overwrite them when prompted.
Back on how to do it. I encoded the audio to QAAC 320 in the Audio tab. It looks like this before uploading, and after.
I then created a single picture video in the General tab. However, I have noticed that the the contrast is reduced/the colour is washed out, grey/whitish. It recoded the video (exclude audio size) from 7 MB to 21 MB. There was a 'it can process faster if it's streamable' so I tried [urlhttp://www.datagoround.com/lab/]MP4 FASTSTART[/url] to add the metadata for streaming. It is a method that worked but not any more, using it now induce 'video/audio is out of sync'. I then tried Avidemux, Video Output is Copy, output format MP4v2 Muxer, check Optimize for streaming in Configure. No more warning but all three videos resulted in 21 MB and all have the colour being less vibrant problem. So maybe use Sony Vegas instead?
Another downlside is that there will be fewer download options. http://keepvid.com/?url=https%3A%2F%2Fyoutu.be%2FcepJaYzvC1s