AVAnimator Assertion failure in -[AVMvidFrameDecoder advanceToFrame:] 'framebuffer num bytes' - ios

Question

I have dolwoaded the latest code from Github for AVAnimator library. I added the folders AVAnimator and LZMASDK in addition to AutoPropertyRelease.h and AutoPropertyRelease.m.
I am using the following code to play a video with alpha channel (adopted form another AVAnimator app examples):
CGRect iPhoneExplosionRect = CGRectMake(0, -2, 640/2, 480/2);
CGRect iPadExplosionRect = CGRectMake(0, -5, 840, 630);
NSString *rgbResourceName = #"ExplosionAdjusted_rgb_CRF_30_24BPP.m4v";
NSString *alphaResourceName = #"ExplosionAdjusted_alpha_CRF_30_24BPP.m4v";
// Output filename
NSString *tmpFilename;
NSString *tmpPath;
tmpFilename = #"Explosion.mvid";
tmpPath = [AVFileUtil getTmpDirPath:tmpFilename];
// Set to TRUE to always decode from H.264
BOOL alwaysDecode = FALSE;
if (alwaysDecode && [AVFileUtil fileExists:tmpPath]) {
BOOL worked = [[NSFileManager defaultManager] removeItemAtPath:tmpPath error:nil];
NSAssert(worked, #"could not remove file %#", tmpPath);
}
// This loader will join 2 H.264 videos together into a single 32BPP .mvid
AVAssetJoinAlphaResourceLoader *resLoader = [AVAssetJoinAlphaResourceLoader aVAssetJoinAlphaResourceLoader];
resLoader.movieRGBFilename = rgbResourceName;
resLoader.movieAlphaFilename = alphaResourceName;
resLoader.outPath = tmpPath;
//resLoader.alwaysGenerateAdler = TRUE;
AVAnimatorMedia *media = [AVAnimatorMedia aVAnimatorMedia];
media.resourceLoader = resLoader;
self.expMedia = media;
// Frame decoder will read from generated .mvid file
AVMvidFrameDecoder *aVMvidFrameDecoder = [AVMvidFrameDecoder aVMvidFrameDecoder];
media.frameDecoder = aVMvidFrameDecoder;
// Create layer that video data will be directed into
CGRect expFrame;
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
expFrame = iPhoneExplosionRect;
} else {
expFrame = iPadExplosionRect;
}
CALayer *layer = [CALayer layer];
layer.frame = expFrame;
}
if (FALSE) {
layer.backgroundColor = [UIColor orangeColor].CGColor;
}
[self.view.layer addSublayer:layer];
AVAnimatorLayer *animatorLayer = [AVAnimatorLayer aVAnimatorLayer:layer];
self.expAnimatorLayer = animatorLayer;
// Finally connect the media object to the layer so that rendering will be
// sent to the layer.
[animatorLayer attachMedia:media];
//media.animatorRepeatCount = 3;
//media.animatorRepeatCount = 30;
//media.animatorRepeatCount = INT_MAX;
[media prepareToAnimate];
Once prepareToAnimate is hit the application fails at an assertion as described below
** Assertion failure in -[AVMvidFrameDecoder advanceToFrame:], /Users/user/Documents/.../AVAnimator/AVMvidFrameDecoder.m:844
...*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'framebuffer num bytes'
Is it the architecture I am using (both 32 and 64 bit) causing it or something else?
I hope someone can put me on the right track
AF

Answer 1

I looked into this assert and different ways it might be reproduced. I tried improperly setting the arch flags to include only 32 bit or only 64 bit code in the executable and tested on a 64 bit device and the simulator. I was not able to reproduce the problem and it is not clear how it could happen. To gather more information, I added an extra check that is compiled in either DEBUG or OPT mode when the framebuffer is allocated, could you pull the most recent version of AVAnimator from the github or grab the patch from patch here. Please make sure that none of the defines were modified in your version of the code and that you are using the most recent version of Xcode.