Java programmers must feel that making Windows desktop applications in Java is worse a lot than using almost any other programming languages. Software developed with other languages is mostly the EXE format by default, whereas for Java: the less one has to run under console, the better one can only run in the form of JAR file, even with no program icon to choose from. And the most terrible thing is anyone who unzips your JAR file can instantly take in all the source code of your program in a glance.

Recently, my camera broke down and I had to use my laptop's low-end inbuilt camera to take photos (I haven't had a smartphone yet, maybe I will buy one as soon as possible for the convenience of taking photos). Even worse, the image format used by ECap is BMP, which is extremely big in size. So I tried to convert it to PNG format with PNGGauntlet, but found that it would take dozens of hours at least to convert 356 BMP format of images to PNG format. This is really a bit joke!

In some cases, we would like to convert video to audio: e.g.:, For a recorded video of a great speech, now you only want to listen to it without looking at the picture; Turn whole TV series and movies into audiobooks; Extract pleasant but nameless background music from various video clips. At this point, we can use 4K Video to MP3 to convert video in any format into high quality audio file with one click.