I would like to render a simple audio and JPEG video and upload it to YouTube.

I have an optimised JPEG which is exactly 640x480 pixels in size and is a high quality photograph.
I also have an mp3 which is encoded at 320kbps bitrate.
I have installed KDEnlive with all codecs and it appears to be up and running, and rendering, happily.

However, when I render this simple montage using the 'YouTube 640x480 2 pass' profile, I find that the resulting mp4 file contains acceptable audio, but a very blurred and degraded JPEG image. I would really like to be able to retain the quality of the JPEG photograph is possible.

I have two questions:
1. How can I ensure that the optimised JPEG image is not degraded or blurred by KDEnlive at rendering?
2. How can I ensure that the mp3 audio quality is as good as possible in the rendered mp4 file?

Should I be using a different output profile? Or tweaking with the aforementioned profile settings?

Please help! Thank you!

Pipps