1. What is the difference between MPG, MPEG, MPEG-2, and MPEG-4?
MPEG/MPG: They are in essence the same, just with different extensions. MPEG is the standard specification name. Note that MPEG and MPG are only containers that typically use MPEG-1 or MPEG-2 codecs.
MPEG-2: This is a video codec used to compress and decompress video streams stored inside the MPEG/MPG container. In many cases, MPEG/MPG and MPEG-2 can be used interchangeably.
MPEG-4: MPEG-4 is a video codec and also part of the MPEG family but with much higher compression efficiency. It's often used interchangeably with MP4.
2. Why should I convert MPG to MP4?
Compared to the old MPG files, MP4 offers broader compatibility and smaller file size, which makes it easier to play and share. So it's recommended to convert MPG to MP4.
3. Why won't my converted MP4 video play?
MP4 is just a container like MPG/MPEG. The codec inside decides if the video can be played on your device. For example, if you use HEVC/H265 as the encoder in MP4, Windows cannot play it natively and requires you to install the HEVC extension. Make sure you use H264 as the encoder if you want to achieve universal compatibility.