The alpha channel supports 256 levels of transparency, enabling you to add anti-aliased edges around subject matter in your video frame. Alpha channel support: The VP6-E codec implemented by Flash Player 8 and newer can utilize a transparency layer, also called an alpha channel.Efficient compression: On2 VP6-E can more efficiently compress video data, resulting in smaller file sizes for equivalent bit rates.Superior image quality: Given equivalent bit rates, video using the VP6-E codec is visually more stunning than video using Sorenson Spark.The following are its strengths over other codecs: VP6-E is a modern video codec, designed for fast processors and low bit rates. flv file extension for playback in Flash Player. Files encoded with the On2 VP6-E codec use the. The superior image quality of the VP6-E codec, combined with its efficient compression for low bit rates, has significantly increased the adoption of Flash-based video. Sorenson Spark opened the possibility of video playback within a Flash movie, but the On2 VP6-E codec included with Flash Player 8 and newer inaugurated a new era of Web video. Software and hardware vendors that use the codec pay the licensing fees. License-free delivery: You do not have to pay any additional licensing fees to deploy video encoded with the Sorenson Spark codec.You can purchase live hardware-encoding solutions for other video codecs, but they’re not cheap. Live video: To broadcast live events from Flash applications, use Spark.Wide range of playback platforms: From smart phones to mobile devices supporting the Flash platform, Sorenson Spark is one of the only codecs that performs well with slow processors.In summary, the Sorenson Spark codec is ideal for projects requiring the following: If you’re distributing on fixed media such as CD/DVD-ROM and want the video to play on slower machines, storage and bit rate issues may be less important. For example, you need about 20 percent more bit rate for Spark to produce the same quality with VP6-E. Inefficient compression: You can achieve visual quality with Sorenson Spark on par with other Web video codecs-at the cost of higher bit rates.If you want the best quality Web video for online distribution over low bit rates, you shouldn’t use the Spark codec. Lower-quality video: Sorenson Spark’s image quality is inferior to the other video codecs available in Flash Player.The live video can be broadcast only to a Real Time Messaging Protocol (RTMP)–enabled server, such as an Adobe Flash Media Server application.ĭespite the codec’s wide availability and reduced demands on the processor, Spark has a few drawbacks: You can broadcast live video from a Web cam using the Sorenson Spark codec. Encoder and decoder solution: The Sorenson Spark codec is the only codec whose compression encoder exists in the regular Flash Player.As a result, you can encode more content in less time. Speed of compression: The Spark codec compresses video faster than the On2 VP6 codec.Encoding products availability: Many inexpensive (and open source) video-encoding solutions offer only the Spark codec.Widest acceptance: As I mentioned earlier, Spark is available in Flash Player 6 and newer versions. If you need to deploy video to a wide range of computers, including machines with processors slower than Pentium IIIs or Power Mac G4s, you should strongly consider using the Spark codec. The rule of thumb is that Spark requires about half as much processing power and memory as On2 VP6-E. Reduced processing: The Spark codec requires less computer processing and memory (RAM) than the newer On2 VP6 codec.The primary benefits of using Sorenson Spark as your Flash-compatible video codec revolve around processing power: Files encoded with the Spark codec use the. If you need the widest range of compatibility for your Web video files, use the Sorenson Spark codec. In 2002, when video first made its debut in Flash Player 6, Sorenson Spark was the video codec that made it all happen. You’ll learn how to access and use the metadata of a Flash-compatible video file in Chapter 7, “Building Your Own Video Player.” Sorenson Spark codec (H.263)
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