[mythtv] Possible playback scenarios for the iPhone

Chase Douglas chasedouglas.lists at gmail.com
Sun Jul 20 19:13:44 UTC 2008

On Jul 19, 2008, at 5:19 PM, Kevin Kuphal wrote:

> On Fri, Jul 18, 2008 at 5:58 PM, Chase Douglas <chasedouglas.lists at gmail.com 
> > wrote:
> I am interested in developing a frontend for the iPhone with live tv
> playback, but there are two hurdles along the way:
> 1. Content is encoded in the format coming from the tuner device, and
> as far as I am aware, no tuning device outputs an iPhone compatible
> format
> 2. The iPhone SDK (I'm trying to keep this under Apple's terms as
> well) has no streaming video support. At best, it can take a static
> file and stream that from a URL, but there's no support for streaming
> mutable content like an rtsp:// stream. A further complication is
> Apple's insistence that developers cannot access the framebuffer.
> The first issue could be remedied through live transcoding before
> streaming to the device. This isn't implemented yet, but is possible.
> The second issue is a much higher hurdle. Without the ability to play
> streaming content within the SDK, the only way this could work is
> through software decoding and playback through either a quartz
> graphics layer or an opengl layer. I've never written any rendering
> software but I know it's possible. My question is: would the iPhone be
> powerful enough for a reasonably encoded stream to be played back? By
> reasonable, I'm thinking standard mpeg-2 or the mpeg-4 encoding, but
> keeping in mind that I'll have no access to the hardware acceleration
> already present on the iPhone.
> Have you seen this?
> http://code.google.com/p/mythtv-for-iphone/
> Kevin

That will only work with streaming static, recorded content. A live- 
streaming implementation is needed to be able to watch live tv playback.


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