最新做的一个功能涉及到了视频的录制、压缩及上传。根据网上诸多大神的经验，终于算是调通了，但也发现了一些问题，所以把我的经验分享一下。
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首先，肯定是调用一下系统的相机或相册
代码很基本：
//选择本地视频
- (void)choosevideo
{
UIImagePickerController *ipc = [[UIImagePickerController alloc] init];
ipc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;//sourcetype有三种分别是camera，photoLibrary和photoAlbum
NSArray *availableMedia = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];//Camera所支持的Media格式都有哪些,共有两个分别是@"public.image",@"public.movie"
ipc.mediaTypes = [NSArray arrayWithObject:availableMedia[1]];//设置媒体类型为public.movie
[self presentViewController:ipc animated:YES completion:nil];
ipc.delegate = self;//设置委托
}
//录制视频
- (void)startvideo
{
UIImagePickerController *ipc = [[UIImagePickerController alloc] init];
ipc.sourceType = UIImagePickerControllerSourceTypeCamera;//sourcetype有三种分别是camera，photoLibrary和photoAlbum
NSArray *availableMedia = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];//Camera所支持的Media格式都有哪些,共有两个分别是@"public.image",@"public.movie"
ipc.mediaTypes = [NSArray arrayWithObject:availableMedia[1]];//设置媒体类型为public.movie
[self presentViewController:ipc animated:YES completion:nil];
ipc.videoMaximumDuration = 30.0f;//30秒
ipc.delegate = self;//设置委托
} iOS录制的视频格式是mov的，在Android和Pc上都不太好支持，所以要转换为MP4格式的，而且压缩一下，毕竟我们上传的都是小视频，不用特别清楚
为了反馈的清楚，先放两个小代码来获取视频的时长和大小，也是在网上找的，稍微改了一下。
- (CGFloat) getFileSize:(NSString *)path
{
NSLog(@"%@",path);
NSFileManager *fileManager = [NSFileManager defaultManager];
float filesize = -1.0;
if ([fileManager fileExistsAtPath:path]) {
NSDictionary *fileDic = [fileManager attributesOfItemAtPath:path error:nil];//获取文件的属性
unsigned long long size = [[fileDic objectForKey:NSFileSize] longLongValue];
filesize = 1.0*size/1024;
}else{
NSLog(@"找不到文件");
}
return filesize;
}//此方法可以获取文件的大小，返回的是单位是KB。
- (CGFloat) getVideoLength:(NSURL *)URL
{
AVURLAsset *avUrl = [AVURLAsset assetWithURL:URL];
CMTime time = [avUrl duration];
int second = ceil(time.value/time.timescale);
return second;
}//此方法可以获取视频文件的时长。接收并压缩
//完成视频录制，并压缩后显示大小、时长
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSURL *sourceURL = [info objectForKey:UIImagePickerControllerMediaURL];
NSLog(@"%@",[NSString stringWithFormat:@"%f s", [self getVideoLength:sourceURL]]);
NSLog(@"%@", [NSString stringWithFormat:@"%.2f kb", [self getFileSize:[sourceURL path]]]);
NSURL *newVideoUrl ; //一般.mp4
NSDateFormatter *formater = [[NSDateFormatter alloc] init];//用时间给文件全名，以免重复，在测试的时候其实可以判断文件是否存在若存在，则删除，重新生成文件即可
[formater setDateFormat:@"yyyy-MM-dd-HH:mm:ss"];
newVideoUrl = [NSURL fileURLWithPath:[NSHomeDirectory() stringByAppendingFormat:@"/Documents/output-%@.mp4", [formater stringFromDate:[NSDate date]]]] ;//这个是保存在app自己的沙盒路径里，后面可以选择是否在上传后删除掉。我建议删除掉，免得占空间。
[picker dismissViewControllerAnimated:YES completion:nil];
[self convertVideoQuailtyWithInputURL:sourceURL outputURL:newVideoUrl completeHandler:nil];
}
- (void) convertVideoQuailtyWithInputURL:(NSURL*)inputURL
outputURL:(NSURL*)outputURL
completeHandler:(void (^)(AVAssetExportSession*))handler
{
AVURLAsset *avAsset = [AVURLAsset URLAssetWithURL:inputURL options:nil];
AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:avAsset presetName:AVAssetExportPresetMediumQuality];
// NSLog(resultPath);
exportSession.outputURL = outputURL;
exportSession.outputFileType = AVFileTypeMPEG4;
exportSession.shouldOptimizeForNetworkUse= YES;
[exportSession exportAsynchronouslyWithCompletionHandler:^(void)
{
switch (exportSession.status) {
case AVAssetExportSessionStatusCancelled:
NSLog(@"AVAssetExportSessionStatusCancelled");
break;
case AVAssetExportSessionStatusUnknown:
NSLog(@"AVAssetExportSessionStatusUnknown");
break;
case AVAssetExportSessionStatusWaiting:
NSLog(@"AVAssetExportSessionStatusWaiting");
break;
case AVAssetExportSessionStatusExporting:
NSLog(@"AVAssetExportSessionStatusExporting");
break;
case AVAssetExportSessionStatusCompleted:
NSLog(@"AVAssetExportSessionStatusCompleted");
NSLog(@"%@",[NSString stringWithFormat:@"%f s", [self getVideoLength:outputURL]]);
NSLog(@"%@", [NSString stringWithFormat:@"%.2f kb", [self getFileSize:[outputURL path]]]);
//UISaveVideoAtPathToSavedPhotosAlbum([outputURL path], self, nil, NULL);//这个是保存到手机相册
[self alertUploadVideo:outputURL];
break;
case AVAssetExportSessionStatusFailed:
NSLog(@"AVAssetExportSessionStatusFailed");
break;
}
}];
} 我这里用了一个提醒，因为我的服务器比较弱，不能传太大的文件
-(void)alertUploadVideo:(NSURL*)URL{
CGFloat size = [self getFileSize:[URL path]];
NSString *message;
NSString *sizeString;
CGFloat sizemb= size/1024;
if(size<=1024){
sizeString = [NSString stringWithFormat:@"%.2fKB",size];
}else{
sizeString = [NSString stringWithFormat:@"%.2fMB",sizemb];
}
if(sizemb<2){
[self uploadVideo:URL];
}
else if(sizemb<=5){
message = [NSString stringWithFormat:@"视频%@，大于2MB会有点慢，确定上传吗？", sizeString];
UIAlertController * alertController = [UIAlertController alertControllerWithTitle: nil
message: message
preferredStyle:UIAlertControllerStyleAlert];
[alertController addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
[[NSNotificationCenter defaultCenter] postNotificationName:@"refreshwebpages" object:nil userInfo:nil];
[[NSFileManager defaultManager] removeItemAtPath:[URL path] error:nil];//取消之后就删除，以免占用手机硬盘空间（沙盒）
}]];
[alertController addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
[self uploadVideo:URL];
}]];
[self presentViewController:alertController animated:YES completion:nil];
}else if(sizemb>5){
message = [NSString stringWithFormat:@"视频%@，超过5MB，不能上传，抱歉。", sizeString];
UIAlertController * alertController = [UIAlertController alertControllerWithTitle: nil
message: message
preferredStyle:UIAlertControllerStyleAlert];
[alertController addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
[[NSNotificationCenter defaultCenter] postNotificationName:@"refreshwebpages" object:nil userInfo:nil];
[[NSFileManager defaultManager] removeItemAtPath:[URL path] error:nil];//取消之后就删除，以免占用手机硬盘空间
}]];
[self presentViewController:alertController animated:YES completion:nil];
}
} 最后上上传的代码，这个是根据服务器来的，而且还是用的MKNetworking，据说已经过时了，放上来大家参考一下吧，AFNet也差不多，就是把NSData传上去。
-(void)uploadVideo:(NSURL*)URL{
//[MyTools showTipsWithNoDisappear:nil message:@"正在上传..."];
NSData *data = [NSData dataWithContentsOfURL:URL];
MKNetworkEngine *engine = [[MKNetworkEngine alloc] initWithHostName:@"www.ylhuakai.com" customHeaderFields:nil];
NSMutableDictionary *dic = [[NSMutableDictionary alloc] init];
NSString *updateURL;
updateURL = @"/alflower/Data/sendupdate";
[dic setValue:[NSString stringWithFormat:@"%@",User_id] forKey:@"openid"];
[dic setValue:[NSString stringWithFormat:@"%@",[self.web objectForKey:@"web_id"]] forKey:@"web_id"];
[dic setValue:[NSString stringWithFormat:@"%i",insertnumber] forKey:@"number"];
[dic setValue:[NSString stringWithFormat:@"%i",insertType] forKey:@"type"];
MKNetworkOperation *op = [engine operationWithPath:updateURL params:dic httpMethod:@"POST"];
[op addData:data forKey:@"video" mimeType:@"video/mpeg" fileName:@"aa.mp4"];
[op addCompletionHandler:^(MKNetworkOperation *operation) {
NSLog(@"[operation responseData]-->>%@", [operation responseString]);
NSData *data = [operation responseData];
NSDictionary *resweiboDict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
NSString *status = [[resweiboDict objectForKey:@"status"]stringValue];
NSLog(@"addfriendlist status is %@", status);
NSString *info = [resweiboDict objectForKey:@"info"];
NSLog(@"addfriendlist info is %@", info);
// [MyTools showTipsWithView:nil message:info];
// [SVProgressHUD showErrorWithStatus:info];
if ([status isEqualToString:@"1"])
{
[[NSNotificationCenter defaultCenter] postNotificationName:@"refreshwebpages" object:nil userInfo:nil];
[[NSFileManager defaultManager] removeItemAtPath:[URL path] error:nil];//上传之后就删除，以免占用手机硬盘空间;
}else
{
//[SVProgressHUD showErrorWithStatus:dic[@"info"]];
}
// [[NSNotificationCenter defaultCenter] postNotificationName:@"StoryData" object:nil userInfo:nil];
}errorHandler:^(MKNetworkOperation *errorOp, NSError* err) {
NSLog(@"MKNetwork request error : %@", [err localizedDescription]);
}];
[engine enqueueOperation:op];
} 以上所述是小编给大家介绍的iOS视频录制（或选择）压缩及上传功能（整理），希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对创新互联网站的支持！
