贴点我的转换代码
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(void)videoWithUrl:(NSURL *)url withFilePath:(NSString *)filePath
{[[NSFileManager defaultManager] createFileAtPath:filePath contents:nil attributes:nil];
NSFileHandle *handle = [NSFileHandle fileHandleForWritingAtPath:filePath];
static const NSUInteger BufferSize = 1024*1024;ALAssetsLibrary *assetLibrary = [[ALAssetsLibrary alloc] init];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
if (url) {[assetLibrary assetForURL:url resultBlock:^(ALAsset *asset) { ALAssetRepresentation *rep=[asset defaultRepresentation]; uint8_t *buffer = calloc(BufferSize, sizeof(*buffer)); NSUInteger offset = 0, bytesRead = 0; do { bytesRead = [rep getBytes:buffer fromOffset:offset length:BufferSize error:nil]; [handle writeData:[NSData dataWithBytesNoCopy:buffer length:bytesRead freeWhenDone:NO]]; offset += bytesRead; } while (bytesRead > 0); free(buffer);
