Part 2.mp4
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Part 2.mp4
MPEG-4 Part 2 is H.263 compatible in the sense that a basic H.263 bitstream is correctly decoded by an MPEG-4 Video decoder. (MPEG-4 Video decoder is natively capable of decoding a basic form of H.263.)[2][3][4] In MPEG-4 Visual, there are two types of video object layers: the video object layer that provides full MPEG-4 functionality, and a reduced functionality video object layer, the video object layer with short headers (which provides bitstream compatibility with base-line H.263).[5] MPEG-4 Part 2 is partially based on ITU-T H.263.[6] The first MPEG-4 Video Verification Model (simulation and test model) used ITU-T H.263 coding tools together with shape coding.[7]
Most of the video compression schemes standardize the bitstream (and thus the decoder) leaving the encoder design to the individual implementations. Therefore, implementations for a particular profile (such as DivX or Nero Digital which are implementations of Advanced Simple Profile and Xvid that implements both profiles) are all technically identical on the decoder side. A point of comparison would be that an MP3 file can be played in any MP3 player, whether it was created through iTunes, Windows Media Player, LAME, or the common Fraunhofer encoder.
MPEG-4 Part 2 has drawn some industry criticism. FFmpeg's maintainer Michael Niedermayer has criticised MPEG-4 for lacking an in-loop deblocking filter, GMC being too computationally intensive, and OBMC being defined but not allowed in any profiles among other things.[15] Microsoft's Ben Waggoner states "Microsoft (well before my time) went down the codec standard route before with MPEG-4 part 2, which turns out to be a profound disappointment across the industry - it didn't offer that much of a compression advantage over MPEG-2, and the protracted license agreement discussions scared off a lot of adoption. I was involved in many digital media projects that wouldn't even touch MPEG-4 in the late 1990s to early 2000s because there was going to be a 'content fee' that hadn't been fully defined yet."[16]
For .mp4 files (which I obtained from DailyMotion.com: a 50 minute tv episode, downloadable only in three parts, as three .mp4 video files) the following was an effective solution for Windows 7, and does NOT involve re-encoding the files.
Till now, the MPEG4 can be divided into many parts, MPEG4 part 2, MPEG4 part 3, MPEG4 part 10, MPEG4 part 14, and so on. Each part is meaningful and indispensable since it covers a certain aspect of the entire specification:
What is an MP4 file? MP4 is actually short for MPEG4 part 14 and it stands for the digital multimedia container format which is frequently used to save video and audio. But it can store more than that; subtitles, still images, and other data can also be stored. As you can see easily, MPEG4 part 14 is one of the parts of the MPEG4 compressing algorithm mentioned above.
One of the most obvious features of MP4 is that it supports streaming over the Internet, just like other modern container formats. Though .mp4 is the only official filename extension for the MPEG4 part 14 files, it still has many other extensions, including .m4v, .m4p, and .m4a (it is audio-only) - M4A stands for MPEG4 audio (the last letter A refers to audio files).
The act of removing data in the process of encoding video requires that some details be lost. If enough compression is applied, parts or potentially all of the image could lose sharpness, resulting in a slightly fuzzy or hazy appearance.
Lossy compression algorithms can introduce ringing, an effect where areas outside an object are contaminated with colored pixels generated by the compression algorithm. This happens when an algorithm that uses blocks that span across a sharp boundary between an object and its background. This is particularly common at higher compression levels.
Similarly, you can remove frames from the video entirely and decrease the frame rate to compensate. This has two benefits: it makes the overall