Podcast: 2005年2月 Archives
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读了ken兄的网志“初探Podcast”,感觉似乎很有研究一下的必要。
首先要搞清楚,这个Podcast到底是什么意思?wikipedia上的定义是这样的。而奇怪的是,在中文wikipedia上,竟然没有查到与Podcast相关的条目!不知道是不是我的操作有什么问题。
果然和我猜的一样,"podcasting"这个新词是由“iPod”和“broadcasting(广播)”这两个词派生出来的。望文生义,根据这两个词源,我们便可以大致猜测podcasting指的是利用以iPod为代表的多媒体文件播放器,来接受以类似广播(broadcasting)的方式发布的多媒体内容的行为。
Podcast无疑是一种新的炙手可热的技术或称为应用,许多文章都热情洋溢的推介了它,但得承认,它的特点并不是非常容易被认识到,毕竟,它看起来与早已没有任何新鲜感可言的网络电台和mp3等多媒体文件的下载服务是如此的相似。
一个典型的Podcast的过程是这样的:发布Podcast的人,可以利用任何自己习惯使用的工具,制作一段音频或视频文件,并利用某种工具生成Podcasting RSS(这一步是Podcast与可下载mp3相区别的关键),之后再将生成的Podcasting RSS发布,供其他人订阅(可以是支持Podcasting的RSS阅读器如FeedDemon,也可以是专用的Podcasting接收器如Doppler等);对于接收方来说,使用接收器订阅了节目源后,就几乎不用操心了,如同以往阅读BLOG的经验一样,根本无须再跑遍各处站点,只要有更新的节目(podcast),便会自动接收,也可以设置为自动copy到指定的目录中,如果你选择了copy到你的iPod或是其他mp3播放器中,便只需要下载完后拔下来,随走随听,非常方便。当然,完全不使用iPod等播放器,而只是在PC上播放下载的多媒体文件,也是可以的,只是这样的乐趣应该会减少许多。
注一:
The term "podcasting" is a portmanteau of the words iPod and broadcasting. Although an iPod is currently the playback device of choice for many early adopters of podcasting, a portable music player is not required to take advantage of this method of content distribution. Podcasting is functionally similar to the use of timeshift-capable digital video recorders (DVRs), such as TiVo, which let users record and store television programs for later viewing.
A podcast is much like an audio magazine subscription: a subscriber receives regular audio programs delivered via the internet, and she or he can listen to them at her or his leisure.
Podcasts differ from traditional internet audio in two important ways. In the past, listeners have had to either tune in to web radio on a schedule, or they have had to actively download individual files from webpages. Podcasts are more flexible and much easier to get. They can be listened to at any time because a copy is on the listener's computer or portable music player, and they are automatically delivered to subscribers, so no active downloading is required.
待续...


