deoComposition *)videoComposition shouldContinueva lidatingAfterFindingInvalidTimeRangeInInstruction:(id<AVVideoCompositionInstruction>)videoCompositionInstruction
{
NSLog(@"%s===%@",__func__,videoCompositionInstruction);
return YES;
}
- (BOOL)videoComposition:(AVVideoComposition *)videoComposition shouldContinueva lidatingAfterFindingInvalidTrackIDInInstruction:(id<AVVideoCompositionInstruction>)videoCompositionInstruction layerInstruction:(AVVideoCompositionLayerInstruction *)layerInstruction asset:(AVAsset *)asset
{
NSLog(@"%s===%@===%@",__func__,layerInstruction,asset);
return YES;
}
重新运行一下发现第三个方法打印输出，就是instruction的timeRange问题了，又重新看了一下两个instruction的设置问题,感觉又没什么问题，代码如下：
- (void)buildCompositionWithAssets:(NSArray *)assetsArray
{
for (int i = 0; i < assetsArray.count; i++) {
AVURLAsset *asset = assetsArray[i];
NSArray *videoTracks = [asset tracksWithMediaType:AVMediaTypeVideo];
NSArray *audioTracks = [asset tracksWithMediaType:AVMediaTypeAudio];
AVAssetTrack *videoTrack = videoTracks[0];
AVAssetTrack *audioTrack = audioTracks[0];
NSError *error = nil;
AVMutableCompositionTrack *videoT = [self.avcompostions.mutableComps addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
AVMutableCompositionTrack *audioT = [self.avcompostions.mutableComps addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
[videoT insertTimeRange:videoTrack.timeRange ofTrack:videoTrack atTime:self.offsetTime error:&error];
[audioT insertTimeRange:audioTrack.timeRange ofTrack:audioTrack atTime:self.offsetTime error:nil];
NSAssert(!error, @"insert error = %@",error);
AVMutableVideoCompositionInstruction *instruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
AVMutableVideoCompositionLayerInstruction *layerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoT];
instruction.layerInstructions = @[layerInstruction];
instruction.timeRange = CMTimeRangeMake(self.offsetTime, asset.duration);
[self.instrucionArray addObject:instruction];
self.offsetTime = CMTimeAdd(self.offsetTime,asset.duration);
}
}
这个数组里面会有两个加载好的AVAsset对象，加载AVAsset的代码如下：
- (void)loadAssetFromPath:(NSArray *)paths
{
NSMutableArray *assetsArray = [NSMutableArray arrayWithCapacity:paths.count];
dispatch_group_t dispatchGroup = dispatch_group_create();
for (int i = 0; i < paths.count; i++) {
NSString *path = paths[i];
//first find from cache
AVAsset *asset = [self.assetsCache objectForKey:path];
if (!asset) {
NSDictionary *inputOptions = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:AVURLAssetPreferPreciseDurationAndTimingKey];
asset = [AVURLAsset URLAssetWithURL:[NSURL fileURLWithPath:path] options:inputOptions];
// cache asset
NSAssert(asset != nil, @"Can't create asset from path", path);
NSArray *loadKeys = @[@"tracks", @"duration", @"composable"];
[self loadAsset:asset withKeys:loadKeys usingDispatchGroup:dispatchGroup];
[self.assetsCache setObject:asset forKey:path];
}else