MPEG stands for Moving Pictures Experts Group. This is a body that develops standards for video encoding. The two major standards are MPEG2 and MPEG4.
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MPEG2 vs MPEG4
The main difference between MPEG2 and MPEG4 is that MPEG2 is suitable for encoding videos and is compatible with DVD media. On the other hand, MPEG4 is suitable for portable devices and streaming videos from the internet.
MPEG2 was developed to facilitate the encoding of videos on DVDs. DVD media was an emerging platform when MPEG2 was developed. Later, online streaming came into play. MPEG2 was not compatible with streaming the videos from the internet, and thus, MPEG4 was developed.
The limitations of MPEG2 were overcome by MPEG4. It could easily stream the online videos even though both MPEG2 and MPEG4 could maintain the video quality.
MPEG4 was useful for portable devices like mobile phones and media players, unlike MPEG2. This also is a preferred format as it provides video files of smaller sizes.
Comparison Table Between MPEG2 and MPEG4 (in Tabular Form)
|Parameter of Comparison||MPEG2||MPEG4|
|Encoding||For the encoding of DVDs, MPEG2 is used.||For the encoding of portable devices and internet streaming, MPEG4 is used.|
|Size||The size of MPEG2 videos is bigger in comparison to MPEG4.||The size of MPEG4 videos is smaller in comparison to MPEG2.|
|Bandwidth Requirement||MPEG2 requires a broader bandwidth in comparison to MPEG4.||MPEG4 requires a smaller bandwidth in comparison to MPEG2.|
|Quality||Video files of MPEG2 are of higher quality.||Video files of MPEG4 are not as good as video files MPEG2.|
|Extensions||Examples of extensions of MPEG2 are: .mp2, mp3, .mpeg, etc.||Examples of extensions of MPEG4 are: .m4a, .m4b, .m4r, .mp4, etc.|
What is MPEG2?
In 1995, MPEG2 was developed for the encoding of videos on DVD media.
It uses a block-based eight by eight DCT for the compression of video coding in its algorithm.
In 1995, the DVD platform was booming, and that is why MPEG2 is ideal for DVD video encoding.
The advantage of MPEG2 is that it maintained the high quality of video files.
The disadvantage of MPEG2 is its inability to shrink the file size.
This is because MPEG2 files are generally used for storage on DVD, thereby resulting in larger file sizes.
Usually, MPEG2 video files are more massive. These are ideal for DVDs and TV broadcasts.
This is why it is a preferred format for over-the-air Televisions like Dish Network, etc.
MPEG2 is better than MPEG4 in terms of quality.
It has a bitrate in the range of 5 to 8 Mbits/sec and also requires a broader bandwidth in comparison to MPEG4 files. The bandwidth of MPEG2 usually is up to 40 MB/second. It used the encoding of H.262.
Video files encoded using MPEG2 are usually with the following extensions: .mpeg, .m2v, .mp2, mp3, .mpg.
MPEG2 uses a simple algorithm for compression of files and provides a superior image quality.
For the compression of videos, MPEG2 discards the information in portions so that the image frame does not change.
Then it only saves the portion where any new information is included. Thus, it has a straightforward algorithm in comparison to MPEG4. MPEG2 is also used for Blu-ray Discs.
What is MPEG4?
MPEG4 was released way after of MPEG4 in 1999.This was the time when the internet was picking up speed. Online videos were emerging, and the streaming of videos through the internet became popular.
MPEG2 was not compatible with portable devices, and thus, a need for a better standard came up.
The limitation of MPEG2 was overcome by MPEG4.
It was a format that was compatible with portable devices like mobile phones. It was also suitable for media players. This is because of its sophisticated algorithm, unlike MPEG2.
This also allows it to be a more versatile format as compared to MPEG2.
MPEG4 provides the additional advantage of compressing the file in a way that the file size reduces. This is essential for the transfer and streaming of videos through the internet.
It utilizes the encoding of H.264.
MPEG4 lacks in one area, which is the quality of videos.
Since it compresses file size to facilitate a smooth transfer of video files over the internet, it also reduces the quality of the files.
It also requires a lower bandwidth and bit rate in comparison to MPEG2. Its bit rate requirement has a range in Kilobytes per second, unlike MPEG2.
Its bandwidth requirement is also around 64 kbps, which is very low as compared to the bandwidth requirement of MPEG2 files that is around 40 Mbps.
Thus, MPEG4 emerged as a universal format for video files because of its small size and low transmission requirements.
Main Differences Between MPEG2 and MPEG4
- MPEG2 video files are suitable for DVD media and television broadcast. In contrast, MPEG4 files are compatible with portable devices like phones and media players.
- MPEG2 provides a better video quality as compared to MPEG4.
- MPEG2 has a bandwidth requirement of about 40 Mbps, whereas MPEG4 has a bandwidth requirement of about 64 Kbps.
- MPEG4 is more suitable for the transmission of videos via the internet as compared to MPEG2.
- Example of MPEG2 file extensions are: mp2, mp3, .mpeg, etc. Whereas, example of MPEG4 file extensions are .m4a, .m4b, .m4r, .mp4, etc.
MPEG2 and MPEG4 are formats used globally. MPEG comprises for parts ranging from MPEG1 to MPEG7 and MPEG21. In these, MPEG2 and MPEG4 tend to be the most prominent and widely used ones.
MPEG2 is more suitable for DVD files and television broadcasts because of its high quality. But it is not suitable for streaming videos from the internet because of its large file size and bandwidth requirements. It is also not compatible with portable devices.
MPEG4 was developed afterward to overcome these limitations. It was compatible with the portable devices and also provided a smaller file size with a lower bit rate and bandwidth requirements. This enables the smooth transfer of files over the internet. Both the format are highly useful in their given areas, but since the world is shifting to online streaming, MPEG4 tends to be a more versatile format.
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