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iRecord H.264 and AAC encoding
The Need for Video Compression

Video, be it film, analog or digital, is a series of still images, called frames, which are displayed in quick succession to provide the illusion of motion. Smooth motion is achieved at about 30 frames per second. A one hour television show is comprised of about 108,000 frames, each with over 300,000 pixels. In order to make digital video practical, it needs to be compressed. Video compression works by identifying similarities between a series of frames and eliminating the redundant information.

Why H.264?

The DVD developed in the early 1990s uses the MPEG-2 video compression standard. Since the introduction of the DVD, both the amount of processing power available in consumer electronic devices and the sophistication and effectiveness of video compression techniques has increased significantly. In the mid 1990s MPEG-4 was developed and offered a 25% increase in compression over MPEG-2. The H.264 standard (also called AVC and MPEG-4 Part 10) was completed in 2003 and represents the current state of the art providing more than twice the compression of MPEG-2. H.264 has been designed to support both small file sizes for portable devices and high definition video for larger displays. H.264 has gained broad market acceptance and is a required format of Blu-Ray players, is implemented in Xbox 360®, PSP, iPod, QuickTime 7+, and numerous other devices.

Encoding H.264

The high compression rate achieved by H.264 comes at a price: accurately encoding H.264 video is very computationally intensive. For this reason most consumer electronics devices, such as TiVo DVRs, record in MPEG-2. The general purpose processors in computers are not optimized for encoding H.264 video which typically takes all the processing power of the computer for what can be many hours.

iRecord Pro

We employ over 60 senior engineers developing cutting edge video compression hardware and software. iRecord is built on the same platform as our professional products: a high performance digital signal processor running our patented H.264 encoder. iRecord was built from the ground up to offer the highest quality real-time encoding of video and audio in multiple formats. iRecord’s ability to combine smooth vibrant video with small file sizes in a simple to use device is unmatched by any competitor at any price. We continually raise the bar by enhancing our technology and sharing those enhancements with existing iRecord users through free firmware upgrades.


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