HandBrake is an easy, free to download encoding tool. Download it from: https://handbrake.fr/.
Simian recommends the presets listed below.
1. Format is set to MP4 File.
2. Web optimized check box is checked.
3. Video Codec is H264.
4. Frame Rate is the same as source.
5. Average Bit Rate we recommend setting bit rate between 1800 to 2500.
6. Select the Audio tab in the middle of the window.
7. Audio Codec is set to AAC.