jtrim - Developer IT

What is PTS in reference to video encoding?

- by jtrim

Could someone briefly explain what the acronym PTS means in reference to video encoding?

Apple documentation incorrect about MKMapView -regionThatFits: ?

In the Apple documentation for the -regionThatFits: method of the MKMapView, it says that this will return a new region centered on the same point as the region that's passed in, only with the regions bounds corrected for the iPhone screen aspect ratio. This seems to be incorrect in implementation...before the call to this method, my region shows…

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Trying to compile x264 and ffmpeg for iPhone - "missing required architecture arm in file"

- by jtrim

I'm trying to compile x264 for use in an iPhone application. I see there are instructions on how to compile ffmpeg for use on the platform here: http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2009-October/076618.html , but I can't seem to find anything this complete for compiling x264 on the iPhone. I've found this source tree:…

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Calling UIGetScreenImage() on manually-spawned thread prints "_NSAutoreleaseNoPool():" message to lo

- by jtrim

This is the body of the selector that is specified in NSThread +detachNewThreadSelector:(SEL)aSelector toTarget:(id)aTarget withObject:(id)anArgument NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; while (doIt) { if (doItForSure) { NSLog(@"checking"); doItForSure =…

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iPhone - Get a pointer to the data behind CGDataProvider?

- by jtrim

I'm trying to take a CGImage and copy its data into a buffer for later processing. The code below is what I have so far, but there's one thing I don't like about it - it's copying the image data twice. Once for CGDataProviderCopyData() and once for the :getBytes:length call on imgData. I haven't been able to find a way to copy…

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Cocoa - does CGDataProviderCopyData() actually copy the bytes? Or just the pointer?

- by jtrim

I'm running that method in quick succession as fast as I can, and the faster the better, so obviously if CGDataProviderCopyData() is actually copying the data byte-for-byte, then I think there must be a faster way to directly access that data...it's just bytes in memory. Anyone know for sure if CGDataProviderCopyData() actually…

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iPhone / Cocoa - Are NSThreads less efficient than POSIX threads, or is the diff negligable?

- by jtrim

I'm looking at putting together a high-performance multi-threaded iPhone app that's doing a couple of fairly high-intensity operations concurrently. Is the performance difference between NSThread and POSIX threading enough to care about here? If so, I would assume POSIX threads would be more efficient because it bypasses the…

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FFmpeg + iPhone - Interesting (incorrect?) video encoding results

- by jtrim

I'm encoding some video on the iPhone by running the png image data through swscale to get YUV420P data then encoding that frame using the MSMPEG4V1 codec. In the api docs, avcodec_encode_video should return the number of bytes used from the output buffer by that encode operation. There are 234,000 bytes going into the…

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iPhone - is there any way to look at the core data store for a live app?

- by jtrim

I've got a live app on the app store that's producing some strange results when the user upgrades versions that I can't reproduce in my dev environment. Does anyone know of a way to inspect the core data store of a live iPhone app?

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Xcode 3.2 iPhone dev - Can't download development application data anymore?

- by jtrim

In the organizer of Xcode 3.1.x I used to be able to download the application data for an app in development (not installed thru itunes). In Xcode 3.2 I don't see that option anywhere. Am I missing something?

Developer IT