Java FFMPEG を使用してファイルをある形式から別の形式に変換する

/*
By using this command, we are not converting the video
into different codecs but changing the container format
to contain the same video as the input file.
*/
ffmpeg - i input.mkv output1.mp4

/*
This command converts the input video file into
`vp9` codec and the audio contained in that container
into the `vorbis ogg` format.
*/
ffmpeg - i input.mkv - c : v vp9 - c : a libvorbis output2.webm

/*
This command converts the video codec to `vp9` and keeps
the audio codec as it is.
*/
ffmpeg - i input.mkv - c : v vp9 - c : a copy output3.webm

/*
Here, we convert the audio codec to `libvorbis`
and keep the video codec as it is.
*/
ffmpeg - i input.mkv - c : v copy - c : a libvorbis output4.mkv

/*
This command keeps the audio codec as it is, converts
the video codec to `libx264` by reducing the bitrate to `1M`.
*/
ffmpeg - i input.mkv - c : a copy - c : v libx264 - b : v 1M output5.mp4

/*
This command keeps the audio codec as it is, converts the video
the codec to `libx264` and reduce the fps to 24.
*/
ffmpeg - i input.mkv - c : a copy - c : v libx264 - r 24 output6.mp4

/*
This command keeps the audio codec as it is, converts the video
the codec to `libx264` reduces the resolution to `848x480`.
*/
ffmpeg - i input.mkv - c : a copy - c : v libx264 - s 848x480 output.mp4

/*
This command keeps the audio codec as it is, converts the video
the codec to `libx264`, reduce the resolution to `848x480`, and bitrate for the video to `1M`, and
change fps to 30.
*/
ffmpeg - i input.mkv - c : a copy - c : v libx264 - b : v 1M - r 30 - s 848x480 output.mp4

/*
This command trims the video length to 10 seconds, starting
from the given beginning point.
*/
ffmpeg - i input.mkv - ss 00 : 00 : 10 - t 10 output.mkv

// it extracts the audio from a video file
ffmpeg - i input.mkv - vn output.m4a

// it speeds up the audio
ffmpeg - i input.mkv - filter : a "atempo=2.0" - vn output.mkv

// it changes the speed of the video
ffmpeg - i input.mkv - filter : v "setpts=0.125*PTS" output.mp4

// replace the package with your own if you have
package com.voidtesting.ffmpeg_java_wrapper;

// import necessary libraries
import java.io.File;
import java.io.IOException;

// FFMPEG_Java_Wrapper class
public class FFMPEG_Java_Wrapper {
  // main
  public static void main(String[] args) {
    // try block
    try {
      // create process
      Runtime rt = Runtime.getRuntime();
      // save the location
      File folder = new File("C:\\Users\\DelftStack\\Desktop\\MediaFiles");
      // save all files in an array that are retrieved from the specified folder
      File[] file = folder.listFiles();

      /*
      for each filename, open the command prompt
      and execute the specified command.
       */
      for (int i = 0; i < file.length; i++) {
        rt.exec("cmd.exe /c start "
                + "ffmpeg -i " + file[i].getName() + " -vn output" + (i + 1) + ".m4a",
            null, folder);
      } // end for

    } // end try
    catch (IOException e) {
      System.out.println(e);
    } // end catch

  } // end main
} // end FFMPEG_Java_Wrapper

<build>
        <plugins>
            <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <version>2.4</version>
                <configuration>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                    <archive>
                        <manifest>
                            <mainClass>
                               <!--make sure to replace the name
                                   of your Main file here-->
                               com.voidtesting.ffmpeg_java_wrapper
                                .FFMPEG_Java_Wrapper
                            </mainClass>
                        </manifest>
                    </archive>
                </configuration>
                <executions>
                    <execution>
                        <id>make-assembly</id>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

C:\Users\Dell\\.m2\repository\com\voidtesting\ffmpeg_java_wrapper\FFMPEG_Java_Wrapper\1.0-SNAPSHOT

java -jar FFMPEG_Java_Wrapper-1.0-SNAPSHOT-jar-with-dependencies.jar