这段代码在模拟器上运行良好。但是,当我尝试在我的 iPad 上运行导出时,它总是以 0.14583-ish 的进度值挂起。有人可以帮我弄清楚为什么吗?卡在这上面好久了。
这是我的代码:
NSArray *compatiblePresets = [AVAssetExportSession exportPresetsCompatibleWithAsset:composition];
if ([compatiblePresets containsObject:AVAssetExportPresetLowQuality]) {
AVAssetExportSession *exportSession = [[AVAssetExportSession alloc]
initWithAsset:composition presetName:AVAssetExportPresetLowQuality];
exportSession.outputURL = [NSURL fileURLWithPath:[[ShowDAO getUserDocumentDir] stringByAppendingString:exportFilename]];
exportSession.outputFileType = AVFileTypeQuickTimeMovie;
CMTime start = CMTimeMakeWithSeconds(0, 1);
CMTime duration = CMTimeMakeWithSeconds(1000, 1);
CMTimeRange range = CMTimeRangeMake(start, duration);
exportSession.timeRange = range;
[exportSession exportAsynchronouslyWithCompletionHandler:^{
switch ([exportSession status]) {
case AVAssetExportSessionStatusCompleted:
NSLog(@"Export Completed");
break;
case AVAssetExportSessionStatusFailed:
NSLog(@"Export failed: %@", [[exportSession error] localizedDescription]);
break;
case AVAssetExportSessionStatusCancelled:
NSLog(@"Export cancelled");
break;
default:
break;
}
}];
while(exportSession.progress != 1.0){
NSLog(@"loading... : %f",exportSession.progress);
sleep(1);
}
[exportSession release];
}
while(exportSession.progress != 1.0){
NSLog(@"loading... : %f",exportSession.progress);
sleep(1);
}
这个while循环阻塞了主线程。 NSLog 可能无法正常触发。不使用 while 循环试试?
关于ios - AVAssetExportSession 进度卡在 ipad 上但不在模拟器上,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7702977/
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