Supported Media File Types

Digital media formats: Codecs versus file containers

Despite international efforts to create standard-based audio and video formats, many format types are incompatible.

The Codec (compressor and decompressor) is the method used to compress and decompress digital media files. Audio/video streams usually incorporate two separate codecs: one for the compressed video and one for the compressed audio. The MPEG codecs include profiles and levels, which are the minimum processing requirements for a compliant decoder. Examples of codecs are:

■JPEG: Used by almost all digital cameras to compress digital images.

■MPEG-1, MPEG-2, and MPEG-4: Audio and video codecs developed by International Standards Technical committees.

■VC-1: A video codec developed by Microsoft.

■Dolby Digital: An audio codec used in DVD movies and in high-definition broadcasting.

The File container is the type of file that the digital bit stream is stored in, regardless of the codec used. File containers have a specific structure, which helps decoders identify the codecs necessary for playback. File containers may support multiple codecs, and may also include media metadata, DRM (digital rights management) keys, and other stream-related parameters. Examples of file containers are:

■AVI (.avi)

■Quicktime (.mov)

■MP4 (.mp4)

■WMV (.wmv)

■DivX (.divx)

■Mpeg (.mpg)

Popular codecs

■MPEG codecs. The Motion Pictures Experts Group (MPEG) has developed a variety of A/V codecs, including:

■MPEG-1, which is used in VCD movies.

■MPEG-2, which includes the audio codecs MPEG-2 Layer II (MP2) and MPEG-2 Layer III (MP3), and which is used in DVDs, in HDTV, and in many movie download services.

■MPEG-4, part 2, which is the basis for DivX, Xvid, and other low bit-rate codecs.

■MPEG-4, part 10, or H.264, or Advanced Video Codec (AVC), which is the basis for HD-DVD and Blu-ray formats. It is also the default video codec in iTunes.

■AAC (Advanced Audio Codec, also known as MPEG-2, part 7, or MPEG-4, part 3), is the default audio codec in iTunes.

With MPEG-2, MPEG introduced for the first time the concept of profiles and levels. Profiles and levels define the minimum processing requirements for a compliant decoder. For example:

■DVD movies use MPEG-2 at Main profile and Main Level (or MPEG-2 MP@ML).

■HDTV uses a subset of Main profile at High Level (MP@HL).

■Two of the most common profiles for MPEG-4, part 2, are the Simple Profile (SP) and the Advanced Simple Profile (ASP).

■Windows Media Codecs. Microsoft has developed a number of codecs, including:

■WMV7 and WMV8, which are early versions of the Microsoft video codec.

■WMV9, which is the current version of the Microsoft video codec.

■VC-1, which is the Advanced Profile of the WMV9 codec, and which is needed for support by both Blu-ray and HD-DVD players.

■WMA (Windows Media Audio), including WMA Pro, which is a multi-channel audio codec.

Specifications

Specifications 89

Page 98 Page 100
Page 99
Image 99
HP SL4278N 42 inch manual Supported Media File Types, Digital media formats Codecs versus file containers, Popular codecs
Page 98 Page 100

SL4778N 47 inch, SL4278N 42 inch specifications

The HP LC3772N, PL4272N, PL5072N, LC4276N, and SL4278N represent a diverse range of plasma television offerings that cater to various viewing preferences and room sizes.

Starting with the HP LC3772N, this 37-inch plasma model is ideal for medium-sized living spaces, providing high-definition display quality. The LC3772N boasts a resolution of 1024x768 pixels, ensuring that viewers can enjoy crystal clear images with vibrant colors. With a refresh rate that minimizes motion blur, this model is perfect for watching fast-paced sports or action films. The unit also features multiple connectivity options, including HDMI and component inputs, allowing for seamless connection with gaming consoles and other multimedia devices.

Next, the PL4272N is a 42-inch plasma television that enhances the viewing experience with its larger screen size and advanced features. It offers similar resolution capabilities as the LC3772N but adds improved contrast ratios, enhancing picture depth and clarity. The PL4272N supports 720p high-definition video and includes built-in speakers designed to elevate audio output. This model is known for its wide viewing angles, making it suitable for gatherings with family or friends, ensuring everyone enjoys a stellar view.

The PL5072N takes this performance a step further with a generous 50-inch screen, suitable for a more immersive home theater experience. This model features 1080p full HD resolution, delivering stunning visuals with rich detail that enhances movie nights and gaming sessions. The advanced plasma technology used in the PL5072N offers deeper blacks and brighter whites, creating an impressive dynamic range. Its sleek design and thin profile also make it an attractive addition to any living room decor.

The LC4276N stands out in the 42-inch category with its innovative energy-saving features, making it not just a visual delight but also an environmentally friendly choice. Equipped with advanced image processing technologies, the LC4276N delivers enhanced color accuracy and sharpness.

Finally, the SL4278N is another 42-inch plasma television that showcases a modern design and smart features. It delivers stunning picture quality with low input lag, appealing to gamers who demand responsive gameplay. The SL4278N includes networking capabilities, enabling users to enjoy streaming content from popular services directly on their screen.

In summary, these HP plasma models vary in size and features but all deliver exceptional picture quality, making them suitable for varied viewing preferences and settings.
Top Page Image Contents