java截取第一帧（Java代码实现上传获取某一帧作为截图封面）

上一个文章讲了Java代码实现上传视频获取视频某一帧作为截图封面的一种方法，现在讲述第二种方法为什么要在这里讲这种方法呢？第一、这种方法生成的图片占用的空间更小第二、这种方法可以获取很多信息，我来为大家科普一下关于java截取第一帧?以下内容希望对你有帮助!

java截取第一帧

上一个文章讲了Java代码实现上传视频获取视频某一帧作为截图封面的一种方法，现在讲述第二种方法。为什么要在这里讲这种方法呢？第一、这种方法生成的图片占用的空间更小第二、这种方法可以获取很多信息

一、跟上一篇文章一样导入Maven项目所需要的依赖，这里不在复制，可以去上篇文章看一下

二、废话不多说直接上代码

package com.basic.common.utils; import org.bytedeco.javacv.FFmpegFrameGrabber; import org.bytedeco.javacv.FrameGrabber; import org.bytedeco.javacv.Frame; import org.bytedeco.javacv.Java2DFrameConverter; import org.springframework.web.multipart.MultipartFile; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; import javax.imageio.ImageIO; import java.awt.*; import java.awt.image.BufferedImage; import java.io.*; /** * @author summer * @date 2021-11-02 15:42 */ public class VideoUtils2 implements MultipartFile { private final byte[] imgContent; private final String header; public VideoUtils2(byte[] imgContent, String header) { this.imgContent = imgContent; this.header = header; } public static String fetchFrame(String videoPath) { FFmpegFrameGrabber ff = null; byte[] data = null; ByteArrayOutputStream os = new ByteArrayOutputStream(); try { ff = new FFmpegFrameGrabber(videoPath); ff.start(); int lenght = ff.getLengthInFrames(); int i = 0; Frame f = null; while (i < lenght) { // 过滤前5帧，避免出现全黑的图片 这个根据自己的情况来定，这里就以5秒作为测试 f = ff.grabFrame(); if ((i > 5) && (f.image != null)) { break; } i ; } BufferedImage bi = new Java2DFrameConverter().getBufferedImage(f); String rotate = ff.getVideoMetadata("rotate"); if (rotate != null) { bi = rotate(bi, Integer.parseInt(rotate)); } ImageIO.write(bi, "jpg", os); } catch (Exception e) { e.printStackTrace(); } finally { try { if (ff != null) { ff.stop(); } } catch (FrameGrabber.Exception e) { e.printStackTrace(); } } BASE64Encoder encoder = new BASE64Encoder(); return "data:image/jpg;base64," encoder.encode(os.toByteArray()); } public static BufferedImage rotate(BufferedImage src, int angel) { int src_width = src.getWidth(null); int src_height = src.getHeight(null); int type = src.getColorModel().getTransparency(); Rectangle rect_des = calcRotatedSize(new Rectangle(new Dimension(src_width, src_height)), angel); BufferedImage bi = new BufferedImage(rect_des.width, rect_des.height, type); Graphics2D g2 = bi.createGraphics(); g2.translate((rect_des.width - src_width) / 2, (rect_des.height - src_height) / 2); g2.rotate(Math.toRadians(angel), src_width / 2, src_height / 2); g2.drawImage(src, 0, 0, null); g2.dispose(); return bi; } /** * 将base64转换成MultipartFile * @param base64 * @return */ public static MultipartFile base64ToMultipart(String base64) { try { String[] baseStrs = base64.split(","); BASE64Decoder decoder = new BASE64Decoder(); byte[] b = new byte[0]; b = decoder.decodeBuffer(baseStrs[1]); for(int i = 0; i < b.length; i) { if (b[i] < 0) { b[i] = 256; } } return new VideoUtils2(b, baseStrs[0]); } catch (IOException e) { e.printStackTrace(); return null; } } public static Rectangle calcRotatedSize(Rectangle src, int angel) { if (angel >= 90) { if(angel / 90 % 2 == 1) { int temp = src.height; src.height = src.width; src.width = temp; } angel = angel % 90; } double r = Math.sqrt(src.height * src.height src.width * src.width) / 2; double len = 2 * Math.sin(Math.toRadians(angel) / 2) * r; double angel_alpha = (Math.PI - Math.toRadians(angel)) / 2; double angel_dalta_width = Math.atan((double) src.height / src.width); double angel_dalta_height = Math.atan((double) src.width / src.height); int len_dalta_width = (int) (len * Math.cos(Math.PI - angel_alpha - angel_dalta_width)); int len_dalta_height = (int) (len * Math.cos(Math.PI - angel_alpha - angel_dalta_height)); int des_width = src.width len_dalta_width * 2; int des_height = src.height len_dalta_height * 2; return new Rectangle(new Dimension(des_width, des_height)); } @Override public String getOriginalFilename() { return null; } @Override public String getName() { return null; } @Override public String getContentType() { return header.split(":")[1]; } @Override public long getSize() { return imgContent.length; } @Override public boolean isEmpty() { return imgContent == null || imgContent.length == 0; } @Override public byte[] getBytes() throws IOException { return imgContent; } @Override public void transferTo(File dest) throws IOException, IllegalStateException { new FileOutputStream(dest).write(imgContent); } @Override public InputStream getInputStream() throws IOException { return new ByteArrayInputStream(imgContent); } }

切记包一定要导对哦

下面就是测试代码

public void testPic1() throws IOException { String s = VideoUtils2.fetchFrame("D:\\testdemo\\testdemo.mp4"); VideoUtils2.base64ToMultipart(s).transferTo(new File("D:\\testdemo\\good.jpg")); }

控制台输出如下

C:\software\jdk1.8\bin\java.exe -ea -Didea.test.cyclic.buffer.size=1048576 "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2021.1\lib\idea_rt.jar=54594:C:\Program Files\JetBrains\IntelliJ IDEA 2021.1\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\JetBrains\IntelliJ IDEA 2021.1\lib\idea_rt.jar;C:\Program Files\JetBrains\IntelliJ IDEA 2021.1\plugins\junit\lib\junit5-rt.jar;C:\Program Files\JetBrains\IntelliJ IDEA 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m2\repository\org\bytedeco\javacpp-presets\opencv\3.4.1-1.4.1\opencv-3.4.1-1.4.1-linux-x86.jar;C:\Users\Summer\.m2\repository\org\bytedeco\javacpp-presets\opencv\3.4.1-1.4.1\opencv-3.4.1-1.4.1-linux-x86_64.jar;C:\Users\Summer\.m2\repository\org\bytedeco\javacpp-presets\opencv\3.4.1-1.4.1\opencv-3.4.1-1.4.1-linux-armhf.jar;C:\Users\Summer\.m2\repository\org\bytedeco\javacpp-presets\opencv\3.4.1-1.4.1\opencv-3.4.1-1.4.1-linux-ppc64le.jar;C:\Users\Summer\.m2\repository\org\bytedeco\javacpp-presets\opencv\3.4.1-1.4.1\opencv-3.4.1-1.4.1-macosx-x86_64.jar;C:\Users\Summer\.m2\repository\org\bytedeco\javacpp-presets\opencv\3.4.1-1.4.1\opencv-3.4.1-1.4.1-windows-x86.jar;C:\Users\Summer\.m2\repository\org\bytedeco\javacpp-presets\opencv\3.4.1-1.4.1\opencv-3.4.1-1.4.1-windows-x86_64.jar;C:\Users\Summer\.m2\repository\org\bytedeco\javacpp-presets\ffmpeg-platform\3.4.2-1.4.1\ffmpeg-platform-3.4.2-1.4.1.jar;C:\Users\Summer\.m2\repository\org\bytedeco\javacpp-presets\ffmpeg\3.4.2-1.4.1\ffmpeg-3.4.2-1.4.1-android-arm.jar;C:\Users\Summer\.m2\repository\org\bytedeco\javacpp-presets\ffmpeg\3.4.2-1.4.1\ffmpeg-3.4.2-1.4.1-android-arm64.jar;C:\Users\Summer\.m2\repository\org\bytedeco\javacpp-presets\ffmpeg\3.4.2-1.4.1\ffmpeg-3.4.2-1.4.1-android-x86.jar;C:\Users\Summer\.m2\repository\org\bytedeco\javacpp-presets\ffmpeg\3.4.2-1.4.1\ffmpeg-3.4.2-1.4.1-android-x86_64.jar;C:\Users\Summer\.m2\repository\org\bytedeco\javacpp-presets\ffmpeg\3.4.2-1.4.1\ffmpeg-3.4.2-1.4.1-linux-x86.jar;C:\Users\Summer\.m2\repository\org\bytedeco\javacpp-presets\ffmpeg\3.4.2-1.4.1\ffmpeg-3.4.2-1.4.1-linux-x86_64.jar;C:\Users\Summer\.m2\repository\org\bytedeco\javacpp-presets\ffmpeg\3.4.2-1.4.1\ffmpeg-3.4.2-1.4.1-linux-armhf.jar;C:\Users\Summer\.m2\repository\org\bytedeco\javacpp-presets\ffmpeg\3.4.2-1.4.1\ffmpeg-3.4.2-1.4.1-linux-ppc64le.jar;C:\Users\Summer\.m2\repository\org\bytedeco\javacpp-presets\ffmpeg\3.4.2-1.4.1\ffmpeg-3.4.2-1.4.1-macosx-x86_64.jar;C:\Users\Summer\.m2\repository\org\bytedeco\javacpp-presets\ffmpeg\3.4.2-1.4.1\ffmpeg-3.4.2-1.4.1-windows-x86.jar;C:\Users\Summer\.m2\repository\org\bytedeco\javacpp-presets\ffmpeg\3.4.2-1.4.1\ffmpeg-3.4.2-1.4.1-windows-x86_64.jar;C:\Users\Summer\.m2\repository\junit\junit\4.12\junit-4.12.jar;C:\Users\Summer\.m2\repository\org\hamcrest\hamcrest-core\2.1\hamcrest-core-2.1.jar;C:\Users\Summer\.m2\repository\org\hamcrest\hamcrest\2.1\hamcrest-2.1.jar" com.intellij.rt.junit.JUnitStarter -ideVersion5 -junit4 com.basic.common.TestCase,testPic1 [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000003fc8e0] overread end of atom 'colr' by 1 bytes Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\testdemo\testdemo.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf55.33.100 copyright : copyright-eng : Duration: 00:00:15.10, start: 0.000000, bitrate: 1410 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv), 432x960, 1386 kb/s, 29.45 fps, 29.42 tbr, 15360 tbn, 60 tbc (default) Metadata: handler_name : VideoHandler Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 48 kb/s (default) Metadata: handler_name : SoundHandler Process finished with exit code 0