我正在使用ELCImagePicker从库中选择多个视频，当我尝试导出从库中选择的多个录制视频时，会出现“连接资产被中断或资产死亡”错误。但是如果我使用ELCImagePicker选择所有下载的视频或者我使用UIImagePicker从库中选择这些录制的视频，它可以正常工作。这类问题有解决方案吗？
我的代码：
-(void)elcImagePickerController:(ELCImagePickerController *)picker didFinishPickingMediaWithInfo:(NSArray *)info
{
[self dismissViewControllerAnimated:YES completion:nil];
for (NSDictionary *dict in info) {
if ([dict objectForKey:UIImagePickerControllerMediaType] == ALAssetTypeVideo){
if ([dict objectForKey:UIImagePickerControllerOriginalImage]){
videoUrl=[dict objectForKey:UIImagePickerControllerReferenceURL];
[self InsertVideoAsset];
}
}
}
[self GetMargedVideo];
}
有些时候我的合并作品只播放音频，而不是视频，但有时音频和视频都可以正常播放。波纹管代码有问题吗？请帮帮我......
-(void)GetMargedVideo{
LastTime=kCMTimeZero;
TotalTime=kCMTimeZero;
mixComposition=nil; // AVMutableComposition
mainCompositionInst=nil; // AVMutableVideoComposition
mixComposition=[AVMutableComposition composition];
mainInstruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
renderWidth=1280;
renderHeight=1280;
[Objects removeAllObjects];
//LayerInstruction used to get video layer Instructions
AVMutableVideoCompositionLayerInstruction *firstlayerInstruction;
self.stokeimage.hidden=YES;
for(int i=0; i<[VideoInfo count];i++)
{
self.stokeimage.hidden=NO;
TargetVideo=i;
VideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo
preferredTrackID:kCMPersistentTrackID_Invalid];
AudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio
preferredTrackID:kCMPersistentTrackID_Invalid];
VideoProperty *vp =[VideoInfo objectAtIndex:i];
STime=vp.startTime;
ETime=vp.endTime;
TimeDiff=CMTimeSubtract(ETime, STime);
LastTime=TotalTime;
TotalTime=CMTimeAdd(TotalTime, TimeDiff);
vp.appearTime=LastTime;
TargetTime=LastTime;
avasset=[AVAsset assetWithURL:vp.Url];
//Insert Video and Audio to the Composition "mixComposition"
[VideoTrack insertTimeRange:CMTimeRangeMake(STime, TimeDiff)
ofTrack:[[avasset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:LastTime error:nil];
if([[avasset tracksWithMediaType:AVMediaTypeAudio] count])
{
if(!GetMusic)
{
[AudioTrack insertTimeRange:CMTimeRangeMake(STime, TimeDiff)
ofTrack:[[avasset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] atTime:LastTime error:nil];
}
}
// Add instructions
if(vp.GetInstuction)
{
// GET INSTRUCTION: if Video already have instructions
firstlayerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:VideoTrack];
[firstlayerInstruction setTransform:vp.LayerInstruction atTime:LastTime];
[firstlayerInstruction setOpacity:0 atTime:TotalTime];
[Objects addObject:firstlayerInstruction];
}
else
{
// GET INSTRUCTION: When a Video add first time to the composition
AVAssetTrack *assetTrack = [[avasset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
AVMutableVideoCompositionLayerInstruction *layerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:VideoTrack];
CGAffineTransform videoTransform = assetTrack.preferredTransform;
CGSize naturalSize = assetTrack.naturalSize;
BOOL bLandscape = NO;
CGSize renderSize = CGSizeMake(self.videoplayer.frame.size.width * [[UIScreen mainScreen] scale], self.videoplayer.frame.size.width * [[UIScreen mainScreen] scale]);
renderSize =CGSizeMake(renderWidth, renderHeight);
if(self.videoplayer.frame.size.width > self.videoplayer.frame.size.height && bIsVideoPortrait)
{
bLandscape = YES;
renderSize = CGSizeMake(renderSize.height, renderSize.width);
naturalSize = CGSizeMake(naturalSize.height, naturalSize.width);
}
else if(self.videoplayer.frame.size.height > self.videoplayer.frame.size.width && !bIsVideoPortrait)
{
bLandscape = YES;
renderSize = CGSizeMake(renderSize.height, renderSize.width);
naturalSize = CGSizeMake(naturalSize.height, naturalSize.width);
}
//Orientation Check
CGAffineTransform firstTransform = assetTrack.preferredTransform;
BOOL PotraitVideo=NO;
if (firstTransform.a == 0 && firstTransform.b == 1.0 && firstTransform.c == -1.0 && firstTransform.d == 0) {
PotraitVideo=YES;
// NSLog(@"Potratit Video");
}
if (firstTransform.a == 0 && firstTransform.b == -1.0 && firstTransform.c == 1.0 && firstTransform.d == 0) {
PotraitVideo=YES;
// NSLog(@"Potratit Video");
}
//Orientation Check Finish
if(bIsVideoPortrait)
naturalSize = CGSizeMake(naturalSize.height, naturalSize.width);
scaleValue = 1;
translationPoint = CGPointMake(self.videoplayer.frame.origin.x, self.videoplayer.frame.origin.y);
CGFloat pointX = translationPoint.x * naturalSize.width / self.videoplayer.frame.size.width;
CGFloat pointY = translationPoint.y * naturalSize.height / self.videoplayer.frame.size.height;
pointY=0;
pointX=0;
CGAffineTransform new = CGAffineTransformConcat(videoTransform, CGAffineTransformMakeScale(scaleValue, scaleValue));
CGAffineTransform newer = CGAffineTransformConcat(new, CGAffineTransformMakeTranslation(pointX, pointY));
CGFloat rotateTranslateX = 0;
CGFloat rotateTranslateY = 0;
if(rotationValue - 0.0f > 0.01f && rotationValue - 180.f < 0.01)
rotateTranslateX = MIN((naturalSize.width * rotationValue) / 90.0f, naturalSize.width);
if(rotationValue - 90.0f > 0.01f && rotationValue < 360.0f)
rotateTranslateY = MIN((naturalSize.height * rotationValue) / 180.0f, naturalSize.height);
CGAffineTransform rotationT = CGAffineTransformConcat(newer, CGAffineTransformMakeRotation(DEGREES_TO_RADIANS(rotationValue)));
CGAffineTransform rotateTranslate = CGAffineTransformConcat(rotationT, CGAffineTransformMakeTranslation(rotateTranslateX, rotateTranslateY));
CGSize temp = CGSizeApplyAffineTransform(assetTrack.naturalSize, videoTransform);
CGSize size = CGSizeMake(fabsf(temp.width), fabsf(temp.height));
if(bLandscape)
{
size = CGSizeMake(size.height, size.width);
}
float s1 = renderSize.width/size.width;
float s2 = renderSize.height/size.height;
float s = MIN(s1, s2);
CGAffineTransform new2 = CGAffineTransformConcat(rotateTranslate, CGAffineTransformMakeScale(s,s));
float x = (renderSize.width - size.width*s)/2;
float y = (renderSize.height - size.height*s)/2;
newer2 = CGAffineTransformIdentity;
if(bLandscape)
newer2 = CGAffineTransformConcat(new2, CGAffineTransformMakeTranslation(x, y));
else
newer2 = CGAffineTransformConcat(new2, CGAffineTransformMakeTranslation(x, y));
//Store layerInstruction to an array "Objects"
[layerInstruction setTransform:newer2 atTime:LastTime];
[layerInstruction setOpacity:0.0 atTime: TotalTime];
[Objects addObject:layerInstruction];
vp.GetInstuction=YES;
vp.LayerInstruction=newer2;
vp.Portrait=PotraitVideo;
[VideoInfo replaceObjectAtIndex:i withObject:vp];
}
}
if(GetMusic)
{
OriginalAsset=mixComposition;
AudioTrack=nil;
AudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio
preferredTrackID:kCMPersistentTrackID_Invalid];
[AudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, TotalTime)
ofTrack:[[MusicAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] atTime:kCMTimeZero error:nil];
}
//Apply all the instruction to the the Videocomposition "mainCompositionInst"
mainInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, TotalTime);
mainInstruction.layerInstructions = Objects;
mainCompositionInst = [AVMutableVideoComposition videoComposition];
mainCompositionInst.instructions = [NSArray arrayWithObject:mainInstruction];
mainCompositionInst.frameDuration = CMTimeMake(1, 30);
mainCompositionInst.renderSize = CGSizeMake(renderWidth, renderHeight);
[self PlayVideo];
}