我正在通过AVAssetReader阅读视频样本,我遇到了各种路障。可以从应用程序包中的一个名为“Movie.m4v”的视频设置AVAsset,并使用AVAssetReader循环播放视频帧(CMSampleBufferRef)。阅读视频样本的基本AVAssetReader问题
下面是一些我现在使用代码不起作用的:
NSString *path = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Movie.m4v"];
AVAsset *avAsset = [[AVURLAsset alloc] initWithURL:[NSURL URLWithString:path] options:nil];
NSError *error = nil;
AVAssetReader *reader = [[AVAssetReader alloc] initWithAsset:avAsset error:&error]; // crashing right around here!
// I've gotten avassetreader to not crash upon initialization by grabbing an asset from the ALAssetsLibrary but it says it has 0 tracks!
NSArray *videoTracks = [avAsset tracksWithMediaType:AVMediaTypeVideo];
AVAssetTrack *videoTrack = [videoTracks objectAtIndex:0];
NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:kCVPixelFormatType_32BGRA] forKey:(id)kCVPixelBufferPixelFormatTypeKey];
AVAssetReaderTrackOutput *asset_reader_output = [[AVAssetReaderTrackOutput alloc] initWithTrack:videoTrack outputSettings:options];
[reader addOutput:asset_reader_output];
[reader startReading];
CMSampleBufferRef buffer;
while ([reader status]==AVAssetReaderStatusReading){
buffer = [asset_reader_output copyNextSampleBuffer];
NSLog(@"READING");
}
资产阅读器初始化代码不应该很难正确。 “崩溃”并不多说,那里到底发生了什么? – zoul