Advice for modifying a compressed file without expanding its size?

Hello. Fairly new to video editing, so your advice is appreciated.
I've got a 720x480 WMV3 .AVI video clip which runs about 1/2 hour at a rate of 666kbps. The file size is about 75MB.
In trying to adjust the brightness/contrast on the file and resave it, the file sizes for different formats all shoot way up. The file has a heavy amount of compression to start with. My thinking is that 'high-quality' settings within a codec will actually store too much information, while 'low-quality' settings will further compress the file and result in loss of quality.
Is there any rule of thumb to dealing with an already-compressed file, editing it, and resaving it (without a significant loss of quality) and without greatly increasing file size?
Thanks in advance,
John

John,
You are starting with a heavily-compressed file, the WMV, so original data has been lost.
When you output your Timeline, you will again need to apply heavy-compression, to keep the file size down, and also experiment with the Bit-Rate.
The only aspects, that will address file size, is Duration (pretty much already set), and Bit-Rate. The lower the Bit-Rate, the smaller the file, BUT at the expense of Quality. As you have already taken a hit on Quality, with the initial WMV compression, and you will loose even more Quality, when your re-compress, you need to study the output files, to make sure that they are still satisfactory for delivery.
If you can do the editing required in Windows Movie Maker, it might be a better program to use, as it is built around the WMV specs. Not sure if it has the Effects and control that you need, however.
Good luck,
Hunt

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hth
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HK

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Hi KCSunshine!
Welcome to discussions!
Can not hear audio in iMovie when I import an MPEG clip
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Hello Christopher,
As Barbara pointed out, you can create a standard ZIP file by just right-clicking (or "Control"-Clicking with a single-button mouse) and saying Create Archive.
But, to answer your question about the lack of compression:
Regardless of the compression method used, not all files will benefit from compression.
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Advice for modifying a compressed file without expanding its size?

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