iOS视频录制（或选择）压缩及上传功能（整理）

//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 
} 

- (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。

//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; 
    } 
   }]; 
} 

-(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]; 
 } 
} 

-(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]; 
}