No. That isn't how YouTube works. You misunderstood me.

When you upload a single file to YouTube, depending on the resolution, it will convert the video several times into several different files (all at different resolutions). So, one file turns into many.

This mod will convert your uploaded videos into two different files (by default). The first file will be a lower quality FLV flash file. The second file will be a high quality H.264 file.