ffmpeg -i "Skye-Model 2nd Video.avi" -c:v libx264 -preset medium -crf 20 -c:a aac -b:a 160k "Skye-Model_2nd_web.mp4" If file is large and you want fast encoding:
copy "Skye-Model 2nd Video.avi" "Skye-Model 2nd Video.original.avi" If AVI has broken index: Skye-Model 2nd Video.avi
Basic conversion: