Video file is bigger than the combined size of the files I u

[imdanwhou]

I created a video from pinnacle DC30 captures and edited them in Premiere. I then rendered the completed video back out a single AVI MMJPEG (the same codec that they were captured with)

The resulting file was much bigger than the sum of the capture files I used to create them with. I used Microsoft ADPCM for the audio codec. Do I need use a different audio codec or is it something else?