This excellent library of codecs enables you to play a wide range of common video formats. If youre targeting devices with older players, the video track wont display (although the audio information will play). Generally, your target platform for video encoded with VP6 should be a processor speed of 1.5 GHz or greater.įor large frame sizes (greater than 640 by 480) or video bit rates greater than 500 Kbps, you may want to avoid use the On2 VP6-E codec because the demand on the processor is so high. The alpha channel supports 256 levels of transparency, enabling you to add anti-aliased edges around subject matter in your video frame.Īn alpha channel makes regions of your video transparent, allowing Flash elements behind the video to show through.
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Mtk65xx preloader usb vcom drivers for mac 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.įiles encoded with the On2 VP6-E codec use the.flv file extension for playback in Flash Player.
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Software and hardware vendors that use the codec pay the licensing fees.
You can purchase live hardware-encoding solutions for other video codecs, but theyre not cheap. If youre distributing on fixed media such as CDDVD-ROM and want the video to play on slower machines, storage and bit rate issues may be less important. If you want the best quality Web video for online distribution over low bit rates, you shouldnt use the Spark codec. The live video can be broadcast only to a Real Time Messaging Protocol (RTMP)enabled server, such as an Adobe Flash Media Server application. You can broadcast live video from a Web cam using the Sorenson Spark codec. 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. If you need the widest range of compatibility for your Web video files, use the Sorenson Spark codec.įiles encoded with the Spark codec use the.flv file extension. In this section, youll learn the strengths and weaknesses of each codec. Table 3.4 lists the codecs supported in each version of Flash Player.Įach video codec and audio codec has a unique identifier that is stored in the metadata of a video file, as shown in Tables 3.5 and 3.6.
Over the span of five major releases of Flash Player, five video codecs have been added.
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