Convert existing MP4 video

Really straightforward convert two short MP4 videos to correct type and size ready to upload to Facebook Ads. the ads are only c. 30 seconds long each.
For best results, Facebook recommends uploading videos in . MP4 and . MOV format (see a full list of supported file formats here), with H. 264 compression, square pixels, fixed frame rate, progressive scan, and stereo AAC audio compression at 128kbps+