Question about Alpine Car Audio & Video
Wow. Here is my research so far on this... After viewing APN files in a hex editor, its fairly obvious that the data is MPEG2 encoded (has the string "MPEG-2 Verification Sequence").
I found this page talking about i-Personalize and the specifications of the encoding. Best I can tell it’s not totally correct, but it’s close.
I believe the following about APN files:
* the data is MPEG2 encoded--likely by a Linux based encoding method
* the file is really 2 - 32k files appended together
* the file must be exactly 64k total (65,536 bytes).
* The files get to be their full size via padding bytes at the end (FF values)
* Windows Media Player will play the files if you have "Nero Video Decoder" installed by Nero 7 Ultra Edition (and maybe other versions)
* The duration of the files tends to make it hard to see but Windows Media player does play both frames
* I think the second file is for a different aspect ratio and/or maybe PAL. It may play on rear displays, I don't have one. The file on this forum can be split exactly in half and the files compare identical. I also tested taking an Alpine file, splitting it and appending it to itself--it loaded fine.
Using these facts, I think I know why the original poster of this message hasn't said a thing since posting. The zip file attached contains an APN and JPG file. The JPG is NOT what is in the correctly encoded (I tested it) non-Alpine APN. It is really the goatse.cx guy (See Wikipedia for more info). So be warned you probably do not want that loaded up on your unit.
Thank you for contacting www.Fixya.com
Posted on Jul 30, 2009
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Posted on Jan 02, 2017
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