I've got the following code snippet which is part of code that creates a
CGImage. The CGImage is created but the last line of this code snippet triggers
the output of an error message to the console. The self._movieAsset is an
AVURLAsset created from a local file on disk. I've tried some variations for
the properties of the videoSettings dictionary without making a difference. For
example whether kCVPixelBufferOpenGLCompatibilityKey is a property of the
dictionary or not, has a value of @(YES)/@(NO) does not make any difference.
The console message is:
[18:45:59.824] openglVideoCompositor_SetProperty signalled err=-12784
(kFigBaseObjectError_PropertyNotFound) (unrecognised property) at
/SourceCache/CoreMedia/CoreMedia-1562.19/Prototypes/MediaConverter/VideoCompositing/FigVideoCompositor_OpenGL.c
line 1424
[18:45:59.924] <<<< Boss >>>> figPlaybackBossPrerollCompleted: unexpected
preroll-complete notification
==========================
CMTime frameTime = frame time when I want the frame taken at.
NSArray *tracks = A list of AVAssetTracks
AVAssetReader *assetReader;
assetReader = [[AVAssetReader alloc] initWithAsset:self._movieAsset
error:nil];
if (!assetReader)
{
return nil;
}
NSDictionary *videoSettings = @{
(id)kCVPixelBufferPixelFormatTypeKey :
@(kCVPixelFormatType_32ARGB),
(id)kCVPixelBufferOpenGLCompatibilityKey : @(YES)
};
AVAssetReaderVideoCompositionOutput *vidComp;
vidComp = [AVAssetReaderVideoCompositionOutput
assetReaderVideoCompositionOutputWithVideoTracks:tracks
videoSettings:videoSettings];
AVVideoComposition *avVidComp;
avVidComp = [AVVideoComposition
videoCompositionWithPropertiesOfAsset:self._movieAsset];
vidComp.videoComposition = avVidComp;
if (![assetReader canAddOutput:vidComp])
{
return nil;
}
[assetReader addOutput:vidComp];
// We need a duration for the time range, to do that I'm pulling the
// min frame duration from the first video track. Need to think about
// what alternatives we might have.
AVAssetTrack *track = tracks.firstObject;
CMTimeRange range = CMTimeRangeMake(frameTime, track.minFrameDuration);
assetReader.timeRange = range;
if ([assetReader startReading])
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