Comments on: Idea for a new Mac application http://huibert-aalbers.com/blog/archives/104 Sun, 08 Jan 2012 14:48:01 -0800 http://wordpress.org/?v=2.9.2 hourly 1 By: Huibert http://huibert-aalbers.com/blog/archives/104/comment-page-1#comment-3699 Huibert Mon, 07 May 2007 17:21:19 +0000 http://huibert-aalbers.com/blog/archives/104#comment-3699 Jorge, You are absolutely right. I do not believe that full video frames are being streamed from iTunes to the Apple TV device. As you mention, there must be some time of compression. However, I believe that iTunes streams video in a single format and does not rely on the video codecs on the AppleTV to decode the incoming video feed. That would mean that no matter what kind of video you are streaming (MPEG-2, MPEG-4, etc.) it is sent in a single format. That is the way it works with AirTunes, all sound formats are converted to Apple's Lossless format. This makes it easy to stream all kind of audio without requiring to update the airport express device. Of course, with video this could not be the case, but I have not seen anyone check the theory. It was nice talking with you back in January, Jorge. Jorge,

You are absolutely right. I do not believe that full video frames are being streamed from iTunes to the Apple TV device. As you mention, there must be some time of compression. However, I believe that iTunes streams video in a single format and does not rely on the video codecs on the AppleTV to decode the incoming video feed. That would mean that no matter what kind of video you are streaming (MPEG-2, MPEG-4, etc.) it is sent in a single format. That is the way it works with AirTunes, all sound formats are converted to Apple’s Lossless format. This makes it easy to stream all kind of audio without requiring to update the airport express device. Of course, with video this could not be the case, but I have not seen anyone check the theory.

It was nice talking with you back in January, Jorge.

]]> By: Jorge http://huibert-aalbers.com/blog/archives/104/comment-page-1#comment-3632 Jorge Tue, 01 May 2007 23:35:45 +0000 http://huibert-aalbers.com/blog/archives/104#comment-3632 Hola, "iTunes and the Apple TV most probably exchange video frames" Hmm, not so, I guess... :-( Because if you were to send video frames instead of a coded (= highly-compressed) video stream, the data flow would skyrocket way beyond the maximum bandwidth of the 802.11n link (between the Mac and the AppleTV). The typical data rate of the 801.11n seems to be (*) about between 10 and 21 MByte/s, and a stream of 8bpp uncompressed SD video spits out at 20MByte/s !, or, too much for the link's (typical) bandwidth. Wouldn't be a good idea, for obvious reasons, and, needless to say, uncompressed HD video bandwidth requirements (**) would be impossible to fullfill (46..165 MByte/s). OTOH, why would anybody want to get rid of these nice codecs (that has taken so long to develop) in the weaker piece of the chain (a *radio* link), where they are more needed ? Cuidate, Jorge Chamorro. (*) (**) Hola,

“iTunes and the Apple TV most probably exchange video frames” Hmm, not so, I guess… :-(

Because if you were to send video frames instead of a coded (= highly-compressed) video stream, the data flow would skyrocket way beyond the maximum bandwidth of the 802.11n link (between the Mac and the AppleTV). The typical data rate of the 801.11n seems to be (*) about between 10 and 21 MByte/s, and a stream of 8bpp uncompressed SD video spits out at 20MByte/s !, or, too much for the link’s (typical) bandwidth. Wouldn’t be a good idea, for obvious reasons, and, needless to say, uncompressed HD video bandwidth requirements (**) would be impossible to fullfill (46..165 MByte/s).

OTOH, why would anybody want to get rid of these nice codecs (that has taken so long to develop) in the weaker piece of the chain (a *radio* link), where they are more needed ?

Cuidate,
Jorge Chamorro.

(*)
(**)

]]> By: Huibert http://huibert-aalbers.com/blog/archives/104/comment-page-1#comment-2527 Huibert Thu, 05 Apr 2007 22:10:47 +0000 http://huibert-aalbers.com/blog/archives/104#comment-2527 Well, that is very nice but what Mac users really are looking for is a simple way to stream unsupported video formats to the AppleTV without having to hack their US$300 device and voiding the warranty. Well, that is very nice but what Mac users really are looking for is a simple way to stream unsupported video formats to the AppleTV without having to hack their US$300 device and voiding the warranty.

]]> By: Plop http://huibert-aalbers.com/blog/archives/104/comment-page-1#comment-2526 Plop Thu, 05 Apr 2007 21:14:45 +0000 http://huibert-aalbers.com/blog/archives/104#comment-2526 What do you think about that: http://nanocrew.net/2007/04/05/apple-tv-hacks/ ? What do you think about that: http://nanocrew.net/2007/04/05/apple-tv-hacks/ ?

]]> By: Huibert http://huibert-aalbers.com/blog/archives/104/comment-page-1#comment-2525 Huibert Wed, 04 Apr 2007 14:01:17 +0000 http://huibert-aalbers.com/blog/archives/104#comment-2525 I agree, this was the idea I was proposing but it seems that many misunderstood it. What I would like to do is create a fund, like the one that was created to reward the first person who could boot Windows on an Intel Mac. Getting to US$10,000 shouldn't be that difficult and that would be an interesting price. I agree, this was the idea I was proposing but it seems that many misunderstood it. What I would like to do is create a fund, like the one that was created to reward the first person who could boot Windows on an Intel Mac. Getting to US$10,000 shouldn’t be that difficult and that would be an interesting price.

]]> By: PabOu http://huibert-aalbers.com/blog/archives/104/comment-page-1#comment-2524 PabOu Wed, 04 Apr 2007 13:17:27 +0000 http://huibert-aalbers.com/blog/archives/104#comment-2524 Hi ! $100 is a lot of money to give for an individual. But it's not much, as an award, considering the time and resources one would spent on such a project. I am sure many more people are interested in a replacement and are ready to give some money too... So why not a donation system ? A higher number would be very much more attractive to the developers ;-) Hi !

$100 is a lot of money to give for an individual. But it’s not much, as an award, considering the time and resources one would spent on such a project.

I am sure many more people are interested in a replacement and are ready to give some money too… So why not a donation system ? A higher number would be very much more attractive to the developers ;-)

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