March 07, 2004

ビデオ・オン・デマンド

仕事でVoDの説明を聞きに行った。

要はVoDの最大のライバルというのはレンタルビデオ屋なので、
そこにどのくらいまで近づけるか、というのがポイントらしい。

以下特長についてそういった観点で書いてみた。
僕はアナログ人間なので、当面レンタルビデオ派でいるつもりで、
VoDになんて興味ないけど(なんて言ってていいのか?)
他の人達はどう思ってるのかな?

早送り・巻戻し→これはできてた。それと途中で見るのをやめて
続きを後日みるのも可能です。途中で止めた部分のタイムコードが
サーバにセーブされるというしくみらしい。

画質はどうかというと、MPEG2の3.5Mbps(ソフトにもよる)
ということだから、ビデオよりはよくてDVDよりは悪いと
言ったところ。見た目はいい勝負。
最大の違いはDVDは可変ビットレートなので、例えば、爆発
シーンなど、動きが複雑で早いものについては思いっきり
レートが上がり、そうではないシーンは下がるということ
になるらしい。IPで送るときはそれをやると回線品質を要求
されるので、うまくない、ということで固定になるそうだ。

価格はそのサービスの場合1本400円で2泊3日くらいだと
いうこと。この辺りは遜色ないかな。ちなみに僕がよく
利用しているTSUTAYAは380円で1週間。(新作は100円up)

最大のネックはSTB(セットトップボックス)だ。これを
4年リースで考えると、基本利用料1,000円くらい取らないと
やっていけない額。
それと、ビットレートについては、確かに2Mbpsくらい出れば
かなり画像はキレイだと思ってくれていいけれど、そこまでの
(常時安定しているという意味で)回線を用意するとなると
ADSLではほとんど無理だろう。
CATVで環境のいい所か、もしくは光か。

ちなみに今回お邪魔した会社はある賃貸アパート大手の会社に
環境を提供している会社で、新規に建築されるアパートには
全て光回線を入れてあるので、あまり回線品質は問題にならない
ということ。

結論を言ってしまえば、もうちょっと待てということなんだろう
けど、思っていたよりVoDってできるよね。

Posted by junper at March 7, 2004 01:06 PM
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