前言
本文提供可以调整视频分辨率的java代码，实用主义的狂欢。
环境依赖
添加需要的maven依赖。
<dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>5.7.15</version> </dependency> <dependency> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId> <version>31.0.1-jre</version> </dependency> <dependency> <groupId>org.bytedeco</groupId> <artifactId>javacv-platform</artifactId> <version>1.5.5</version> </dependency>
代码
不废话了。
package com.huyi.csdn.tools; 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: ModifyVideoResolution @Author: 剑客阿良_ALiang @Date: 2021-12-12 * 14:48 @Description: 修改视频分辨率 @Version: V1.0 */ public class ModifyVideoResolution { /** * 修改视频分辨率 * * @param imagePath 原视频地址 * @param outputDir 输出目录 * @param width 宽度 * @param height 高度 * @param bitRate 码率 * @return 视频地址 * @throws Exception 异常 */ public static String modifyResolution( String imagePath, String outputDir, Integer width, Integer height, Integer bitRate) throws Exception { if (bitRate == null) { bitRate = 2000; } List<String> paths = Splitter.on(".").splitToList(imagePath); String ext = paths.get(paths.size() - 1); if (!Arrays.asList("mp4").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", imagePath, "-s", MessageFormat.format("{0}*{1}", String.valueOf(width), String.valueOf(height)), "-b", MessageFormat.format("{0}k", String.valueOf(bitRate)), resultPath); builder.inheritIO().start().waitFor(); return resultPath; } }
代码说明：
1、modifyResolution方法入参分别为：原视频地址、输出目录、需要调整的宽度、高度、码率（码率为null，默认使用2000）。
2、格式校验只校验了mp4，可自行添加。
3、文件名为了避免重复，使用uuid作为文件名。
验证一下：
准备的视频如下：
验证代码：
public static void main(String[] args) throws Exception { System.out.println( modifyResolution("C:/Users/yi/Desktop/981.mp4", "C:/Users/yi/Desktop", 960, 540, null)); }
执行结果：
E:\Java\jdk1.8.0_40\bin\java.exe "-javaagent:E:\Program Files\JetBrains\IntelliJ IDEA 2020.1.1\lib\idea_rt.jar=13771:E:\Program Files\JetBrains\IntelliJ IDEA 2020.1.1\bin" -Dfile.encoding=UTF-8 -classpath 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5-linux-x86.jar;C:\Users\yi\.m2\repository\org\bytedeco\flandmark\1.07-1.5.5\flandmark-1.07-1.5.5-linux-x86_64.jar;C:\Users\yi\.m2\repository\org\bytedeco\flandmark\1.07-1.5.5\flandmark-1.07-1.5.5-linux-armhf.jar;C:\Users\yi\.m2\repository\org\bytedeco\flandmark\1.07-1.5.5\flandmark-1.07-1.5.5-linux-arm64.jar;C:\Users\yi\.m2\repository\org\bytedeco\flandmark\1.07-1.5.5\flandmark-1.07-1.5.5-linux-ppc64le.jar;C:\Users\yi\.m2\repository\org\bytedeco\flandmark\1.07-1.5.5\flandmark-1.07-1.5.5-macosx-x86_64.jar;C:\Users\yi\.m2\repository\org\bytedeco\flandmark\1.07-1.5.5\flandmark-1.07-1.5.5-windows-x86.jar;C:\Users\yi\.m2\repository\org\bytedeco\flandmark\1.07-1.5.5\flandmark-1.07-1.5.5-windows-x86_64.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica-platform\1.80.0-1.5.5\leptonica-platform-1.80.0-1.5.5.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-android-arm.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-android-arm64.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-android-x86.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-android-x86_64.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-linux-x86.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-linux-x86_64.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-linux-armhf.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-linux-arm64.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-linux-ppc64le.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-macosx-x86_64.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-windows-x86.jar;C:\Users\yi\.m2\repository\org\bytedeco\leptonica\1.80.0-1.5.5\leptonica-1.80.0-1.5.5-windows-x86_64.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract-platform\4.1.1-1.5.5\tesseract-platform-4.1.1-1.5.5.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-android-arm.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-android-arm64.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-android-x86.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-android-x86_64.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-linux-x86.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-linux-x86_64.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-linux-armhf.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-linux-arm64.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-linux-ppc64le.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-macosx-x86_64.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-windows-x86.jar;C:\Users\yi\.m2\repository\org\bytedeco\tesseract\4.1.1-1.5.5\tesseract-4.1.1-1.5.5-windows-x86_64.jar;C:\Users\yi\.m2\repository\xyz\downgoon\snowflake\1.0.0\snowflake-1.0.0.jar com.huyi.csdn.tools.ModifyVideoResolution 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/981.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 title : ���ɱ�ֲ�̫��(���ݼ�����).Leon.1994.Directors.Cut.720p.Bluray encoder : Lavf58.45.100 copyright : bbs.cnxp.com(C)2009 description : This File is Created by Easy RealMedia Tools@! keywords : Ӱ�ӵ۹���Ʒ Duration: 00:00:05.64, start: 0.000000, bitrate: 1017 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x688, 881 kb/s, 23.98 fps, 23.98 tbr, 785647.00 tbn, 47.95 tbc (default) Metadata: handler_name : VideoHandler Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default) Metadata: handler_name : SoundHandler Please use -b:a or -b:v, -b is ambiguous 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\30e95d9dff5941c09ec837d4ce518f5d.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 title : ���ɱ�ֲ�̫��(���ݼ�����).Leon.1994.Directors.Cut.720p.Bluray keywords : Ӱ�ӵ۹���Ʒ copyright : bbs.cnxp.com(C)2009 description : This File is Created by Easy RealMedia Tools@! encoder : Lavf58.45.100 Stream #0:0(und): Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 960x540, q=2-31, 2000 kb/s, 23.98 fps, 35029 tbn, 23.98 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), 44100 Hz, stereo, fltp, 128 kb/s (default) Metadata: handler_name : SoundHandler encoder : Lavc58.91.100 aac frame= 122 fps=0.0 q=3.9 Lsize= 1563kB time=00:00:05.04 bitrate=2537.0kbits/s speed=11.5x video:1479kB audio:79kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.356479% [aac @ 000001c18c44bf80] Qavg: 180.360 C:/Users/yi/Desktop\30e95d9dff5941c09ec837d4ce518f5d.mp4 Process finished with exit code 0
验证效果：
OK，修改成功。
总结
没啥总结的。
