Is it possible to create a MPEG4 file that is still hi def?

Hello, I'm new to Compressor, having just installed Compressor 3.5. I have a short Final Cut hi def (1080i) video file that my son wants to upload as a hi def file on youtube. He tried uploading the Final Cut file, but it was too large for youtube (over 3 gig), and apparently they requested a mpeg4 file. I messed with Compressor last night and created a 952 MB file using the Hi Def folder in Setting. I also created a 252 MB file using the MPEG4 folder in Settings. But somehow I don't believe that the MPEG4 file is hi def.
Is it even possible to create an mpeg4 file in compressor that is hi def? If so, could you please tell me which setting to use?
Thanks so much, Bob

Does the 1280 X 720 indicate that it is definitely hi def?
By definition (no pun intended), 'high definition' is any resolution greater than 'standard definition.' Standard definition video in NTSC is 720x480 (NTSC rectangular pixels or NTSC 640x480 square pixels). Standard definition in PAL is 720 x576.
how is it possible to still have hi def, if the file is 1/9 the size of the original file?
For a watered down version of compression, some of the information for each pixel's RGB values are thrown out during the compression process. For example, in MPEG-2 compression (commonly used for DVD and broadcast TV), the first frame is an independent or "I" frame, containing all the data for each pixel's RGB value. The next 14 frames only contain the data for each pixel that changed from the I frame or from the previous frame. This group of 15 frames is known as a GOP (group of pictures). The 16th frame is another "I" frame and consequently starts another GOP.
In reality it's a heck of a lot more complex than that, but that's the basics of video compression. For a more detailed explanation, see: http://en.wikipedia.org/wiki/Video_compression
-DH

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