iOS将视频录像切成一张张缩略图

本文实例为大家分享了ios视频录像切成缩略图的具体代码，供大家参考，具体内容如下

记得导入系统库

#import < mediaplayer/mediaplayer.h >

代码：

/**
 * 获取网络视频的全部缩略图方法
 *
 * @param videourl 视频的链接地址
 *
 * @return 视频截图
 */
+ (uiimage *)ihefe_previewimagewithvideourl:(nsurl *)videourl
{
 avasset *asset = [avasset assetwithurl:videourl];

 avassetimagegenerator *generator = [avassetimagegenerator assetimagegeneratorwithasset:asset];
 generator.appliespreferredtracktransform = yes;

 cgimageref img = [generator copycgimageattime:cmtimemake(1, asset.duration.timescale) actualtime:null error:nil];
 uiimage *image = [uiimage imagewithcgimage:img];

 cgimagerelease(img);
 return image;
}

/**
 * 获取本地视频的全部缩略图方法
 *
 * @param fileurl 视频的链接地址
 *
 * @return 视频截图
 */
+ (uiimage *)ihefe_getscreenshotimagefromvideourl:(nsstring *)fileurl
{

 uiimage *shotimage;
 //视频路径url
 nsurl *fileurl = [nsurl urlwithstring:fileurl];

 avurlasset *asset = [[avurlasset alloc] initwithurl:fileurl options:nil];

 avassetimagegenerator *gen = [[avassetimagegenerator alloc] initwithasset:asset];

 gen.appliespreferredtracktransform = yes;

 cmtime time = cmtimemakewithseconds(0.0, 600);

 nserror *error = nil;

 cmtime actualtime;

 cgimageref image = [gen copycgimageattime:time actualtime:&actualtime error:&error];

 shotimage = [[uiimage alloc] initwithcgimage:image];

 cgimagerelease(image);

 return shotimage;
}

/**
 * 获取视频的某一帧缩略图方法
 *
 * @param videourl 视频的链接地址 帧时间
 * @param time  帧时间
 *
 * @return 视频截图
 */
+ (uiimage*)ihefe_thumbnailimageforvideo:(nsurl *)videourl attime:(nstimeinterval)time
{
 avurlasset *asset = [[avurlasset alloc] initwithurl:videourl options:nil];
 nsparameterassert(asset);
 avassetimagegenerator *assetimagegenerator = [[avassetimagegenerator alloc] initwithasset:asset];
 assetimagegenerator.appliespreferredtracktransform = yes;
 assetimagegenerator.aperturemode = avassetimagegeneratoraperturemodeencodedpixels;

 cgimageref thumbnailimageref = null;
 cftimeinterval thumbnailimagetime = time;
 nserror *thumbnailimagegenerationerror = nil;
 thumbnailimageref = [assetimagegenerator copycgimageattime:cmtimemake(thumbnailimagetime, 60) actualtime:null error:&thumbnailimagegenerationerror];

 if (!thumbnailimageref) nslog(@"thumbnailimagegenerationerror %@", thumbnailimagegenerationerror);

 uiimage *thumbnailimage = thumbnailimageref ? [[uiimage alloc] initwithcgimage:thumbnailimageref] : nil;

 return thumbnailimage;
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。