At present, most MP4s on the market prefer multimedia players, but few can play aac. Some media even described mp4 as the abbreviation of mpeg4-4, which was a fallacy in the past, but this fallacy has become a truth after repeated speculation by merchants. Now, if you go to the computer city and hear the word mp4, it is definitely the concept of a multimedia player that can play video format, not a walkman that can play audio mp4aac. This strange phenomenon is not without reason. As mentioned above, aac has copyright protection function, which is why many record companies support aac. In order to make their players support aac, they have to support the payment of certain copyright fees or patent fees. In addition, the source of aac is also a problem, which is not as public as mp3, and there are few online sources. Therefore, the development of audio mp4 player is not mature at present. In view of the above situation, many businesses simply "come back to life". Comparing the abbreviations of mp4 and mpeg-4 just corresponds to the law that mp4 is the next generation of mp3, which not only supports the music playing function of mp3, but also has powerful mpeg-4 video playing ability. In addition, it makes sense to equate mp4 with mpeg-4 just after "3".
Look at this. It shows that mp4 video is actually a derivative of aac audio. How can you change as you think?
And it would be nice to double mpg to avi. When we make a video, it may be dozens of times bigger!
Judging from your instructions, your machine should be a low-end product. It's possible that a normal machine can play mpg video, but yours has something wrong. After all, general products do not use audio and video decoders. Just because they can't play audio in aac format doesn't mean they can't play mpg4 video.