You uploaded a wide-screen (16:9) video. If your original was 720p or greater (i.e. 1280×720 or greater) we encourage you to submit your video at original resolution to enable better quality playback.
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The best format for Youtube is H264/AVC codec MP4 video (Vælg "export", "MPEG4" "Advanced" "H264", custum 480×360, automatisk navngivning, start (startknap nederst, næsten skjult; filens placering angives som "destination" bemærk at det ikke er i mappen, hvor den oprindelige axp-fil ligger.

You have to convert it to mp3 first, just use google mp4 to mp3 converter
YouTube recommends your video format be

MPEG4 at 640×480, recorded together with
sound in MP3 audio, all at a rate more than
Other files which are
accepted include AVI, MPG, MOV, and the
famous WMV (Windows Movie Maker).
YouTube now accepts file sizes up to 1GB,
YouTube's preferred format is 640×480, but
they actually scale all the uploaded videos
down to 480×360 — which is the size of the

YouTube player window. Because the ratio
would still be 4×3, better-quality videos can
sometimes be achieved by scaling down to
the lower number with a video encoder that
is "high-quality", such as an H.264 "codec".

This would then accomplish several results:
— a smaller file (thus faster uploading)
— YouTube also has less to "process"
— you control the final scaling of pixels
— the video gets high-quality encoding.
24 frames per second

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