Adjusting data speed

In the help for Elements 9, it states "With some video codecs, you can specify the data speed," and I would like to know what codecs these are. At the moment I am trying to convert 1080i video to 720p, and the best I can come up with are files which look decent but have a ludicrously high data speed and are in the range of 3GB for one minute of footage.
Does anyone know what I should be using? Thanks in advance.

If that's the case, you should be outputting your videos using Share/Computer/MPEG using the preset for 1440x1080. This creates an HDV file at excellent editing quality -- about 12 gigs per hour of footage. (Essentially the same as DV-AVIs are for regular definition video.)
You can then load these videos (.m2t's) into a project set up for HDV and they will work beautifully.
Other codecs and compression sets may produce files of varying sizes, but this will create the perfect file for usage in another hi-def project. In fact, other codecs or file formats may actually give you MORE problems later if you try to use them as source footage in another project. (I explain this all in greater details in my book, if you're interested.)
This is likewise the ideal format to output if you plan to use your video as source footage for a BluRay disc.
This is why we always recommend starting at the end to get to the beginning. If you figure out what you ultimately want to output, it's much easier to figure out what you need to do at the beginning.
And all of this, of course, is dependent on your choosing the best project settings for your source footage when you first start your project too.

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