An unexpected true body of Apple genuine HDMI conversion adapter, proved that full HD output was an apron

BySmjbk

Output images with HDMI from Lightning connector Apple has installed in iPhone 5, iPad mini, iPad Retia display model etc.Lightning - Digital AV Adapter, But I am producing applications for iOS and Mac that it is not outputting the image as it is at 1080p (1920 × 1080)PanicDiscovered.

Panic Blog »The Lightning Digital AV Adapter Surprise
http://www.panic.com/blog/2013/03/the-lightning-digital-av-adapter-surprise/


Apple's Lightning-to-HDMI adapter can not mirror the iPad mini's display at 1080p | Ars Technica
http://arstechnica.com/apple/2013/03/apples-lightning-to-hdmi-cant-actually-output-at-1080p/


Apple has reduced the size of the dock connector used up to the iPhone 4S from the iPhone 5Lightning connectorIt changed to.

Panic, which is developing applications for the iPhone, is experimenting with video output to various devices, and also from this Lightning, using the Lightning - Digital AV adapter in the same way HDMI output of the image I noticed a strange thing.

That's it. Since the adapter is said to be "compatible with output at 1080p", the recommended size should be 1920 x 1080 (1080 p), but why it is 1600 x 900.


When noticing something is wrong, I tried connecting the old type dock connector AV adapter in the same way, where the recommended size was properly 1920 x 1080.


When Panic confirmed the video, I found "MPEG Block Noise" which should not come out if only raw data is flowing as it is in HDMI.

Originally, if video mirroring is to be done, I expect that the same clear video as seen on the iPhone will be seen on the connected TV, but when Panic actually connects it will look like this around the letters There was noise in it. Of course this is not included if you use the old adapter.


When Panic disassembles adapter it is full of very small resistors.


Somehow it contained chip of ARM (SoC).


Simply put, "The Lightning - Digital AV adapter is equipped with an image compression system", so once you go through the adapter the image will be 1600 x 900, from which it is upscaled (upconverted) to 1080p That's why. The adapter is not just bridging the connections from the Lightning connector to the HDMI, but that itself was coordinating the video.

According to the circumstances that appeared in the comments section of the article that pointed out this, Since Lightning is a "serial bus", it is impossible to pass a raw HDMI signal like a commonly used HDMI cable, so the output stream is once encoded, passed through Lightning, decoded at the point where it was passed to the ARM SoC It is said that it is being output to HDMI.

However, because it does not depend on what the output destination is, thanks to that, if the other party can make even an adapter to connect with Lightning whatever unknown form, not HDMI, it can output So this may be ants in this, but Apple's sales page clearly "Output with HD quality of up to 1080pWhether you read it, you usually interpret it as "a beautiful picture of 1080p will be output as it is". "I wrote that I can output at 1080p, but actually it has not reached that point, but it is 1080p once.In fact it is a fact that I'd like you to improve it so that it can be beautifully output at 1080p like the adapter before.