前言

本文提供將視頻按照自定義尺寸進行裁剪的Java工具類，一如既往的實用主義，

Maven依賴

        <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>

代碼

不廢話，上代碼，

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

  /**
   * 視頻裁剪
   *
   * @param videoPath 視頻地址
   * @param outputDir 臨時目錄
   * @param startX 裁剪起始x坐標
   * @param startY 裁剪起始y坐標
   * @param weight 裁剪寬度
   * @param height 裁剪高度
   * @throws Exception 例外
   */
  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));
  }
}

代碼說明：

1、cutOutVideo方法引數分別為視頻路徑、輸出臨時目錄、起始坐標x值、起始坐標y值、裁剪寬度、裁剪高度，

2、采用uuid作為臨時輸出唯一id，避免重復，

3、對檔案后綴格式做了校驗，可以按照需求自行調整，

4、裁剪尺寸不能超出視頻解析度限制，按照需求自行調整，

驗證一下

準備的視頻如下

file

執行結果

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

結果視頻如下

file