How I Create Videos Using Free Tools - Mixing Video With Audio
Please visit landing page for these series How I Create Videos Using Free Tools where I explain the overall process for Video creation I use.
In this post I will describe how to mix video WMV file with audio WMA files. For demonstration purposes I will use files I created and described here:
How I Create Videos Using Free Tools - Using Media Encoder To Concatenate WMV files
How I Create Videos Using Free Tools - Using Media Encoder To Create Audio
For mixing purposes I use Media Stream Editor which is installed when you install Media Encoder (free download is here).
Start Media Stream Encoder.
1. Add Video and Audio source files (1, 2, 3)
2. Press "Add" to mix it (4)
3. Press "Create File" to specify destination for resulting WMV file (5)
4. After the destination file specified (1) press "Start" to actually create the file.

5. That is it
The resulting video of mixing these:
How I Create Videos Using Free Tools - Using Media Encoder To Concatenate WMV files
How I Create Videos Using Free Tools - Using Media Encoder To Create Audio
looks like this:
Enjoy