For example, Apple designed the iPod to play H.264 video produced using the Baseline profile, balancing factors such as CPU and memory cost as well as LCD resolution. Why 17 profiles? Because they serve as convenient compatibility points for hardware developers and video producers. This produces a higher-quality file but also one that's harder to decode. As you can see, the encoding techniques are presented on the left, and each successive profile deploys additional techniques to produce the encoded file. The H.264 standard defines 17 different profiles, with the three most relevant to streaming shown in Figure 1, a table adapted from one presented by Wikipedia ( ). This defines a set of encoding techniques that can be used to create the encoded file. With H.264, it's critical to adopt Stephen Covey's advice: "Begin with the end in mind." That's particularly true with device playback, because if you produce a file incorrectly, it won't load or play on your target device.įrom a compatibility standpoint, the most important encoding parameter compatibility is profile. If you're looking for help with more advanced tools, they simply provide too many options to address in an introductory article. Our target reader is the novice working with encoding tools such as Adobe Media Encoder, Apple Compressor, Sorenson Squeeze, and Telestream Episode Pro. In this article, I'll detail what you need to know to produce H.264 files for streaming or device playback. But if you're cutting over from VP6 or Windows Media or expanding distribution to H.264-compatible devices, you're faced with a learning curve. If you've worked with H.264 before, the format is old hat for you. H.264 is the most widely used codec today, whether for streaming via Flash or Silverlight or for the Apple iPod, iPhone, and iPad product lines.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |