使用FFmpeg进行视频解析上传视频数据

package com.greathiit.videoupload.ffmpeg;

import java.io.BufferedReader;
import java.io.File;
import java.io.InputStreamReader;
import java.util.LinkedList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class VideoFFmpeg {

        public static void main(String[] args) {
            String path="E:\\视频批量上传项目\\视频";
            String timeLength = getVideoTime("E:\\视频批量上传项目\\视频\\aa.mp4","D:\\learn\\FFmpeg\\ffmpeg-N-102841-g041267b558-win64-lgpl-shared\\bin\\ffmpeg.exe");
            if(timeLength.length()>0){//字符串截取
                timeLength =timeLength.substring(0,timeLength.indexOf("."));
            }
            System.out.println("视频时长:"+timeLength);
            traverseFolder1(path);

        }

        /**
         *获取视频时间
         * @param video_path  视频路径
         * @param ffmpeg_path ffmpeg安装路径
         * @return
         */
        public static String getVideoTime(String video_path, String ffmpeg_path) {
            List<String> commands = new java.util.ArrayList<String>();
            commands.add(ffmpeg_path);
            commands.add("-i");
            commands.add(video_path);
            System.out.println("命令行:"+ffmpeg_path+" -i "+video_path);
            try {
                ProcessBuilder builder = new ProcessBuilder();
                builder.command(commands);
                final Process p = builder.start();

                //从输入流中读取视频信息
                BufferedReader br = new BufferedReader(new InputStreamReader(p.getErrorStream()));
                StringBuffer sb = new StringBuffer();
                String line = "";
                while ((line = br.readLine()) != null) {
                    sb.append(line);
                }
                br.close();

                //从视频信息中解析时长
                String regexDuration = "Duration: (.*?), start: (.*?), bitrate: (\\d*) kb\\/s";
                Pattern pattern = Pattern.compile(regexDuration);
                Matcher m = pattern.matcher(sb.toString());
                if (m.find()) {

                    System.out.println(video_path+",视频时长："+m.group(1)+", 开始时间："+m.group(2)+",比特率："+m.group(3)+"kb/s");
                    return m.group(1);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }

            return "";
        }
    public static void traverseFolder1(String path) {
        int fileNum = 0, folderNum = 0;
        File file = new File(path);
        if (file.exists()) {
            LinkedList<File> list = new LinkedList<File>();
            File[] files = file.listFiles();
            for (File file2 : files) {
                if (file2.isDirectory()) {
                    System.out.println("文件夹:" + file2.getAbsolutePath());
                    list.add(file2);
                    folderNum++;
                } else {
                    System.out.println("文件:" + file2.getAbsolutePath());
                    fileNum++;
                }
            }
            File temp_file;
            while (!list.isEmpty()) {
                temp_file = list.removeFirst();
                files = temp_file.listFiles();
                for (File file2 : files) {
                    if (file2.isDirectory()) {
                        System.out.println("文件夹:" + file2.getAbsolutePath());
                        list.add(file2);
                        folderNum++;
                    } else {
                        System.out.println("文件:" + file2.getAbsolutePath());
                        fileNum++;
                    }
                }
            }
        } else {
            System.out.println("文件不存在!");
        }
        System.out.println("文件夹共有:" + folderNum + ",文件共有:" + fileNum);

    }

}

使用ffmpeg来获取文件的时长

https://www.cnblogs.com/firstdream/p/7676732.html : 遍历文件夹中的目录和文件

https://www.jb51.net/article/122711.htm ：文件名称修改

遇到问题： 在视频修改的时候由于遍历文件目录和文件名称的时候A层目录修改了到遍历A下一层目录或者文件的时候由于保存在List集合中的绝对路径并没有发生变化就会出现文件找不到的问题。例如：

第一次修改的目录：F:\BaiduNetdiskDownload\mksz355 - 编程必备基础 计算机组成原理+操作系统+计算机网络(更多IT教程 微信352852792)==》F:\BaiduNetdiskDownload\mksz355 - 编程必备基础 计算机组成原理+操作系统+计算机网络

第遍历下一层目录：F:\BaiduNetdiskDownload\mksz355 - 编程必备基础 计算机组成原理+操作系统+计算机网络**(更多IT教程 微信352852792)**\第1章 编程必备基础：计算机组成原理、操作系统、计算机网络(更多IT教程 微信352852792) 此时加黑部分文字已经被第一次修改这时如果执行文件修改就会出现文件找不到的异常

解决办法： 使用回调函数当第一次进行修改后跳出循环重新遍历保存到List集合中如果上一次没有做修改则继续循环

具体逻辑代码如下：

package com.greathiit.videoupload.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.greathiit.videoupload.entity.Course;
import com.greathiit.videoupload.entity.Lesson;
import com.greathiit.videoupload.entity.Section;
import com.greathiit.videoupload.mapper.CourseMapper;
import com.greathiit.videoupload.service.ICourseService;
import com.greathiit.videoupload.service.ILessonService;
import com.greathiit.videoupload.service.ISectionService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.BufferedReader;
import java.io.File;
import java.io.InputStreamReader;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author wtong
 * @since 2022-04-13
 */
@Service
public class CourseServiceImpl extends ServiceImpl<CourseMapper, Course> implements ICourseService {
    private   String NO="no";
    @Autowired
    private ILessonService lessonService;
    @Autowired
    private ISectionService statisticsService;




    @Override
    public void saveCourse(String path) {

//            String timeLength = getVideoTime("E:\\视频批量上传项目\\视频\\aa.mp4","D:\\learn\\FFmpeg\\ffmpeg-N-102841-g041267b558-win64-lgpl-shared\\bin\\ffmpeg.exe");
//            if(timeLength.length()>0){//字符串截取
//                timeLength =timeLength.substring(0,timeLength.indexOf("."));
//            }
//            System.out.println("视频时长:"+timeLength);
        traverseFolder1(path);



    }
    private  void dataEntry(List<String> stringList) {
//        System.out.println(stringList.get(4));
        System.out.println(stringList);
        Course course = new Course();

        course.setTitle(stringList.get(0));
        course.setDescription("<p>"+stringList.get(0)+"<br>></p>");
        course.setLanguage("chinese");
        course.setCategoryId(4);
        course.setSubCategoryId(3);
        course.setSection("[]");
        course.setRequirements("[]");
        course.setLevel("beginner");
        course.setUserId(85);
        course.setDateAdded(1623999600);
        course.setIsAdmin(0);
        course.setStatus("active");
        course.setMetaKeywords(stringList.get(0));
        course.setIsFreeCourse(1);
//        //保存章节
        QueryWrapper<Course> queryWrapper=new QueryWrapper<>();
        queryWrapper.lambda().eq(Course::getTitle,course.getTitle());
//        this.saveOrUpdate(course,queryWrapper);
        Section section=new Section();
        section.setTitle(stringList.get(1));
        section.setCourseId(417);
        try {
            section.setOrder(Integer.parseInt(section.getTitle().substring(1,3)));


        }catch (NumberFormatException e){
            section.setOrder(Integer.parseInt(section.getTitle().substring(1,2)));

        }
        QueryWrapper<Section> sectionQueryWrapper=new QueryWrapper<>();
        sectionQueryWrapper.lambda().eq(Section::getTitle,section.getTitle());
//        statisticsService.saveOrUpdate(section,sectionQueryWrapper);
        Lesson lesson = new Lesson();
        lesson.setTitle(stringList.get(2));
        lesson.setDuration(stringList.get(3));
        lesson.setVideoUrl(stringList.get(6).replace("F:\\BaiduNetdiskDownload",""));
        lesson.setVideoUrlForMobileApplication(stringList.get(6).replace("F:\\BaiduNetdiskDownload",""));
        Long dateAdded = System.currentTimeMillis();
//        String s = dateAdded.toString();
//        Integer sp = Integer.parseInt(s);
//        lesson.setDateAdded(sp);
        lesson.setLessonType("video");
        lesson.setAttachmentType("url");
        try {
            lesson.setOrder(Integer.parseInt(lesson.getTitle().substring(2,4)));


        }catch (NumberFormatException e){
            lesson.setOrder(Integer.parseInt(lesson.getTitle().substring(2,3)));

        }
        lesson.setVideoType("Vimeo");
        lesson.setVideoTypeForMobileApplication("html5");
        Course one = this.getOne(queryWrapper);
        lesson.setCourseId(one.getId());
        Section one1 = statisticsService.getOne(sectionQueryWrapper);

        lesson.setSectionId(one1.getId());
        lesson.setVideoTypeForMobileApplication(stringList.get(6).replace("F:\\BaiduNetdiskDownload",""));
        QueryWrapper<Lesson> queryWrapperlqueryWrap=new QueryWrapper<>();
        queryWrapperlqueryWrap.lambda().eq(Lesson::getTitle,lesson.getTitle());
        lessonService.saveOrUpdate(lesson,queryWrapperlqueryWrap);
        System.out.println(lesson.toString());


    }


//    public static void main(String[] args) {
//        String path="F:\\BaiduNetdiskDownload\\mksz355 - 编程必备基础 计算机组成原理+操作系统+计算机网络";
            String timeLength = getVideoTime("E:\\视频批量上传项目\\视频\\aa.mp4","D:\\learn\\FFmpeg\\ffmpeg-N-102841-g041267b558-win64-lgpl-shared\\bin\\ffmpeg.exe");
            if(timeLength.length()>0){//字符串截取
                timeLength =timeLength.substring(0,timeLength.indexOf("."));
            }
            System.out.println("视频时长:"+timeLength);
//        traverseFolder1(path);
//
//
//    }

    /**
     *获取视频时间
     * @param video_path  视频路径
     * @param ffmpeg_path ffmpeg安装路径
     * @return
     */
    public  String getVideoTime(String video_path, String ffmpeg_path) {
        //将命令行拼接到list集合中
        List<String> commands = new java.util.ArrayList<String>();
        commands.add(ffmpeg_path);
        commands.add("-i");
        commands.add(video_path);
//            System.out.println("命令行:"+ffmpeg_path+" -i "+video_path);
        try {
            ProcessBuilder builder = new ProcessBuilder();
            builder.command(commands);
            final Process p = builder.start();

            //从输入流中读取视频信息
            BufferedReader br = new BufferedReader(new InputStreamReader(p.getErrorStream()));
            StringBuffer sb = new StringBuffer();
            String line = "";
            while ((line = br.readLine()) != null) {
                sb.append(line);
            }
            br.close();

            //从视频信息中解析时长
            String regexDuration = "Duration: (.*?), start: (.*?), bitrate: (\\d*) kb\\/s";
            Pattern pattern = Pattern.compile(regexDuration);
            Matcher m = pattern.matcher(sb.toString());
            if (m.find()) {
                List<String > re=replace(video_path);
//                    System.out.println(re.toString());
                System.out.println(video_path+",视频时长："+m.group(1)+", 开始时间："+m.group(2)+",比特率："+m.group(3)+"kb/s" );
                re.add(m.group(1));
                re.add(m.group(2));
                re.add(m.group(3));
                re.add(video_path);
                dataEntry(re);

                return m.group(1);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return "";
    }


    /**
     * 字符串分割
     * @param video_path 需要分割的绝对路径
     * @return 返回分割好的数据列表
     */
    private  List<String> replace(String video_path) {
        String replace = video_path.replace("F:\\BaiduNetdiskDownload\\mksz355 - ", "");



        Character a=92;
        String am=a.toString();
        System.out.println(replace);
        System.out.println("");
        String[] split1 = replace.split("\\\\");
        int ac=split1.length;
        System.out.println(ac);
        String course = split1[0];//课程名称
        String chapter = split1[1];//章节
        String blues = split1[2];
        String[] split2 = blues.split("\\.");
        blues = split2[0]; //集数

        List<String> list=new ArrayList<>();
        list.add(course);
        list.add(chapter);
        list.add(blues);
        return list;
    }

    public  void traverseFolder1(String path) {
        int fileNum = 0, folderNum = 0;
        File file = new File(path);
        LinkedList<File> rnameList = new LinkedList<>();
        if (file.exists()) {
            LinkedList<File> list = new LinkedList<File>();
            File[] files = file.listFiles();
            for (File file2 : files) {
                if (file2.isDirectory()) {
//                    System.out.println("文件夹:" + file2.getAbsolutePath());
                    list.add(file2);
                    rnameList.add(file2);
                    folderNum++;
                } else {
//                    System.out.println("文件1:" + file2.getAbsolutePath());
                    rnameList.add(file2);

                    fileNum++;
                }
            }
            File temp_file;
            while (!list.isEmpty()) {
                temp_file = list.removeFirst();
                files = temp_file.listFiles();


                for (File file2 : files) {
                    rnameList.add(file2);

                    if (file2.isDirectory()) {
//                        System.out.println("文件夹:" + file2.getAbsolutePath());
                        list.add(file2);
                        folderNum++;
                    } else {

//                        System.out.println("文件2:" + file2.getAbsolutePath());
                        fileNum++;
                    }
                }
            }
        } else {
            System.out.println("文件不存在!");
        }
        System.out.println("文件夹共有:" + folderNum + ",文件共有:" + fileNum);

        int msize = 0;
        for (File file1 : rnameList) {
            String absolutePath = file1.getAbsolutePath();
            String timeLength = getVideoTime(absolutePath,"D:\\learn\\FFmpeg\\ffmpeg-N-102841-g041267b558-win64-lgpl-shared\\bin\\ffmpeg.exe");
            if(timeLength.length()>0){//字符串截取
                timeLength =timeLength.substring(0,timeLength.indexOf("."));
            }
//            System.out.println("视频时长:"+timeLength+"path"+absolutePath);
//            String result = rName(file1);
//            if(!result.equals(NO)){
//                traverseFolder1( path);
//                break;
//
//            }
            msize++;
        }
    }


    private  String rName(File file2) {
        String absolutePath = file2.getAbsolutePath();
        String[] split = absolutePath.split(File.pathSeparator);
        String s = split[split.length - 1];
        String replace = s.replace("(更多IT教程 微信352852792)", "");
        if(s.equals(replace)){
            return NO;
        }
        File file1 = new File(replace);
        if(file2.renameTo(file1)){
            System.out.println("修改成功");
        }else {
            System.out.println("修改失败");
        }
        return replace;
    }
}

数据录入成功后的效果

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-eE1EckoD-1650615602204)(C:\Users\29701\AppData\Roaming\Typora\typora-user-images\1649984062864.png)]

最后还有一个就是前期构建项目的时候遇到的小问题：

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-qadBEruP-1650615602206)(C:\Users\29701\AppData\Roaming\Typora\typora-user-images\1649984159309.png)]

mapper路径和上边的mapper路径冲突，spring容器前期构建的时候找不到mapper包下的bean解决办法修改为maqqer

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-i1d20n1P-1650615602206)(C:\Users\29701\AppData\Roaming\Typora\typora-user-images\1649984317865.png)]

lace);
if(file2.renameTo(file1)){
System.out.println(“修改成功”);
}else {
System.out.println(“修改失败”);
}
return replace;
}
}

数据录入成功后的效果

[外链图片转存中...(img-eE1EckoD-1650615602204)]



最后还有一个就是前期构建项目的时候遇到的小问题：

[外链图片转存中...(img-qadBEruP-1650615602206)]

mapper路径和上边的mapper路径冲突，spring容器前期构建的时候找不到mapper包下的bean解决办法修改为maqqer

[外链图片转存中...(img-i1d20n1P-1650615602206)]

mysql关键字加``解决

进行视频批量处理因为视频缺少h264加入h264生成新的文件后缀多.mp4

function recursive_list_dir(){
for file_or_dir in ls $1
do
if [ -d $1"/"$file_or_dir ]
then
recursive_list_dir $1"/"$file_or_dir
else
file=$1"/"$file_or_dir

            if  [ "${file##*.}" = "mp4" ]
                    then
                            aa="${file##*/}"
                    if   [ "${aa##*.}" = "mp4.mp4" ]
                            then
                            echo "ii"
                            else
                            docker run -it --name app_ffmpeg  -v $PWD:/tmp/workdir  jrottenberg/ffmpeg -i ${file:3} -vcodec h264 ${file:3}.mp4
                            docker rm -f app_ffmpeg

                    fi
            fi

    fi
done

}
recursive_list_dir $1

目录

前言

Maven依赖

代码

总结

前言

本文提供将视频按照自定义尺寸进行裁剪的Java工具类，一如既往的实用主义。

Maven依赖

        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>30.1.1-jre</version>
        </dependency>
        <dependency>
            <groupId>org.bytedeco</groupId>
            <artifactId>javacv-platform</artifactId>
            <version>1.5.5</version>
        </dependency>
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.5.2</version>
        </dependency>

代码

不废话，上代码。

package ai.guiji.csdn.tool;

import cn.hutool.core.util.IdUtil;
import com.google.common.base.Joiner;
import com.google.common.base.Splitter;
import org.bytedeco.javacpp.Loader;

import java.io.File;
import java.text.MessageFormat;
import java.util.Arrays;
import java.util.List;

/**
 * @Program: csdn @ClassName: CutOutTool @Author: 剑客阿良_ALiang @Date: 2022-01-23 18:27 @Description:
 * 裁剪工具 @Version: V1.0
 */
public class CutOutTool {

  /**
   * 视频裁剪
   *
   * @param videoPath 视频地址
   * @param outputDir 临时目录
   * @param startX 裁剪起始x坐标
   * @param startY 裁剪起始y坐标
   * @param weight 裁剪宽度
   * @param height 裁剪高度
   * @throws Exception 异常
   */
  public static String cutOutVideo(
      String videoPath,
      String outputDir,
      Integer startX,
      Integer startY,
      Integer weight,
      Integer height)
      throws Exception {
    List<String> paths = Splitter.on(".").splitToList(videoPath);
    String ext = paths.get(paths.size() - 1);
    if (!Arrays.asList("mp4", "avi", "flv").contains(ext)) {
      throw new Exception("format error");
    }
    String resultPath =
        Joiner.on(File.separator).join(Arrays.asList(outputDir, IdUtil.simpleUUID() + "." + ext));
    String ffmpeg = Loader.load(org.bytedeco.ffmpeg.ffmpeg.class);
    ProcessBuilder builder =
        new ProcessBuilder(
            ffmpeg,
            "-i",
            videoPath,
            "-vf",
            MessageFormat.format(
                "crop={0}:{1}:{2}:{3}",
                String.valueOf(weight),
                String.valueOf(height),
                String.valueOf(startX),
                String.valueOf(startY)),
            "-b",
            "2000k",
            "-y",
            "-threads",
            "5",
            "-preset",
            "ultrafast",
            "-strict",
            "-2",
            resultPath);
    builder.inheritIO().start().waitFor();
    return resultPath;
  }

  public static void main(String[] args) throws Exception {
    System.out.println(
        cutOutVideo("C:\\Users\\yi\\Desktop\\3.mp4", "C:\\Users\\yi\\Desktop\\", 0, 0, 960, 1080));
  }
}

代码说明：

1、cutOutVideo方法参数分别为视频路径、输出临时目录、起始坐标x值、起始坐标y值、裁剪宽度、裁剪高度。

2、采用uuid作为临时输出唯一id，避免重复。

3、对文件后缀格式做了校验，可以按照需求自行调整。

4、裁剪尺寸不能超出视频分辨率限制，按照需求自行调整。

验证一下

准备的视频如下

执行结果

ffmpeg version 4.3.2 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.0 (Rev5, Built by MSYS2 project)
  configuration: --prefix=.. --disable-iconv --disable-opencl --disable-sdl2 --disable-bzlib --disable-lzma --disable-linux-perf --enable-shared --enable-version3 --enable-runtime-cpudetect --enable-zlib --enable-libmp3lame --enable-libspeex --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-openssl --enable-libopenh264 --enable-libvpx --enable-libfreetype --enable-libopus --enable-cuda --enable-cuvid --enable-nvenc --enable-libmfx --enable-w32threads --enable-indev=dshow --target-os=mingw32 --cc='gcc -m64' --extra-cflags=-I../include/ --extra-ldflags=-L../lib/ --extra-libs='-static-libgcc -static-libstdc++ -Wl,-Bstatic -lstdc++ -lgcc_eh -lWs2_32 -lcrypt32 -lpthread -lz -lm -Wl,-Bdynamic -lole32 -luuid'
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\Users\yi\Desktop\3.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
  Duration: 00:00:31.02, start: 0.000000, bitrate: 3666 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 3278 kb/s, 24 fps, 24.42 tbr, 19536 tbn, 48.84 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 384 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Please use -b:a or -b:v, -b is ambiguous
Codec AVOption preset (Set the encoding preset) specified for output file #0 (C:\Users\yi\Desktop\\0ba24b19db0c47faa2cd25bcaee8a3ed.mp4) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> mpeg4 (native))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
Output #0, mp4, to 'C:\Users\yi\Desktop\\0ba24b19db0c47faa2cd25bcaee8a3ed.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
    Stream #0:0(und): Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 960x1080 [SAR 1:1 DAR 8:9], q=2-31, 2000 kb/s, 24.42 fps, 19536 tbn, 24.42 tbc (default)
    Metadata:
      handler_name    : VideoHandler
      encoder         : Lavc58.91.100 mpeg4
    Side data:
      cpb: bitrate max/min/avg: 0/0/2000000 buffer size: 0 vbv_delay: N/A
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      encoder         : Lavc58.91.100 aac
frame=  732 fps=251 q=1.6 Lsize=    7575kB time=00:00:30.01 bitrate=2067.5kbits/s dup=13 drop=0 speed=10.3x    
video:7087kB audio:470kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.249497%
[aac @ 0000022b33400c40] Qavg: 197.756
C:\Users\yi\Desktop\\0ba24b19db0c47faa2cd25bcaee8a3ed.mp4

Process finished with exit code 0

结果视频如下

OK，没什么问题！

总结

没什么好总结的，注意尺寸，注意尺寸，注意尺寸。

分享

        当情绪化的狂热平静下来，拥有推理习惯的人就会去为他自己的信仰寻找逻辑支持。——罗素

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