Files with the extension MPG contain a video encoded in MPEG format.
In most cases, this is a MPEG I encoded video and / or audio stream, but occasionally includes MPEG II encoded video.
MPEG I, despite its relatively old age and only VHS-comparable quality thanks to its small file size and the moderate demands on the computer is still widely used.
MPG files can contain both video and audio streams. Both are encoded in MPEG format. Video and audio streams can be available in a variety of resolutions and bit rates, ie quality levels.
Most players, software like hardware today support the MPEGI and II formats. Even most video editing programs are able to handle this format.
The MPEG I format is also used for VCDs. Because of its much higher quality, MPEG II is the format of choice for DVDs.
The MPEG standard covers more than MPEG I and II. Various lossy compression methods for video and audio data are combined in this standard.
Most often resolving problems with opening MPG files is very simple. Just install an appropriate program that supports such files. All of the listed programs support MPG files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of MPG files or offer file conversion options, but may not be capable of editing such files.
It is possible that although a compatible program has been installed on user’s system, it is not used by the system to open it. This may happen because no default application was associated with this type of files. To associate MPG files with given application, select "Open with" from drop-down menu (accessed by right-clicking on the file). Then select from the list the program or application you want to be used to open this type of file. If the QuickTime Player applications is not on the list, select "Browse" option in order to manually locate the directory where QuickTime Player has been installed.
Sometimes problems with opening MPG files may not lie with the application itself, but can arise due to other causes, such as: