![]() The H.264 video coding and decoding process is shown below. Further, this information will be used to reverse the coding process and recreate a sequence of video images. 264 bitstream, decodes each syntax element, and extracts the information like quantized transform coefficients, prediction information, etc. Now, the H.264 video decoder performs complementary processes like decoding, inverse transform, and reconstruction to produce a decoded video sequence. The output will be macroblocks that consist of block sizes as large as 16×16 pixels. It utilizes a block-oriented standard with motion competition to process frames of video content. The H.264 video encoder performs prediction, transformation, and encoding processes to produce a compressed H.264 bitstream. Sometimes, an H.264 video is encoded with audio compressed with the Advanced Audio Coding (AAC) codec, an ISO/IEC standard (MPEG4 Part 3). MP4 extension, as well as QuickTime (.MOV), Flash (.F4V), 3GP for mobile phones (.3GP), and the MPEG transport stream (.ts). Hence, it is widely used in cable TV broadcasting and Blu-ray disks.Īs a video codec, H.264 is frequently produced in the MPEG-4 container format, which uses the. It delivers good video quality at lower bitrates compared to previous standards. This codec is an industry standard for video compression that helps creators record, compress, and distribute their online videos. Nowadays, H.264 codec is most commonly used in video streaming. It is a video compression technology jointly developed by the International Telecommunications Union (as H.264) and the International Organization for Standardization/International Electrotechnical Commission Moving Picture Experts Group (as MPEG-4 Part 10, Advanced Video Coding, or AVC). H.264 is also called Advanced Video Coding (AVC) or MPEG-4 Part 10. Since the scope of this article is limited to H.264, let us now look at it in detail in the next section. There are hundreds of different codecs such as:Īmong these codecs, H.264/AVC and H.265/HEVC codecs are commonly used in embedded cameras. Decoder – decompresses the file and prepares it for viewing.The block diagram of a codec is shown below. It compresses the raw video and audio files between analog and digital formats and makes them smaller. Making a video compatible with a certain device like a computer, tablet, smartphone, smart TV, etc.Ĭodec is a software or video encoder that encodes or decodes a digital data stream or signal.Converting obsolete files to modern formats. ![]() Changing video resolution or aspect ratio.Some of the common objectives of video encoding are: Later, engineers developed video encoding techniques to compress these files without compromising the quality. The only solution to overcome this issue is to compress these videos, but the quality will be lost through this process. Therefore, 1800 images per minute are used for a video, resulting in a massive video file size. For a video recorded at 30 frames per second (fps), you must use 30 photos per second of footage. In the early days, video files were all in raw formats, i.e., they were a collection of still photos. Importance of video encoding in embedded vision applications Generally, a coder/decoder (codec) is used for video file compression.īefore discussing codec, first, let us look at why video encoding is required in embedded vision applications. In other words, it is the process of compressing and potentially changing an analog source to a digital one. Video encoding is the process of converting raw video files to digital files so that they are not saved as individual images but as fluid videos. In today’s blog, let’s learn what H.264 video encoding is, how it works, and its advantages in detail. One of the most popular encoding technologies is H.264 (AVC – Advanced Video Coding) which has been able to solve many quality issues with respect to video broadcasting. It has also been possible to stream video over the Internet, both real-time and on-demand. But now, video encoding has brought a technological transition – compressing these files to consume less space. Earlier, videos were made of large collections of still photos, and they used excessive bulky files to make them digital. Video technology has undergone a rapid evolution in the past couple of decades.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |