import com.google.common.collect.ImmutableList;
import net.bramp.ffmpeg.builder.FFmpegBuilder;

import java.util.ArrayList;
import java.util.List;

/***
 * 适用于hls协议的构造器,<a href="https://ffmpeg.org/ffmpeg-formats.html#hls-1">hls协议相关参数</a>
 *  @author dqk
 */

public class HLSFFmpegBuilder extends FFmpegBuilder {

    /***
     * Set the maximum number of playlist entries. If set to 0 the list file will contain all the segments. Default value is 5.
     */
    private Integer hlsListSize = 5;

    /***
     * Set the target segment length in seconds. Default value is 2. Segment will be cut on the next key frame after this time has passed.
     */
    private Integer hlsTime = 2;

    /***
     * This is a deprecated option, you can use hls_list_size and hls_flags delete_segments instead it
     *
     * This option is useful to avoid to fill the disk with many segment files, and limits the maximum number of segment files written to disk to wrap.
     */
    @Deprecated
    private Integer hlsWrap = 0;

    public HLSFFmpegBuilder setHlsListSize(Integer hlsListSize) {
        this.hlsListSize = hlsListSize;
        return this;
    }

    public HLSFFmpegBuilder setHlsTime(Integer hlsTime) {
        this.hlsTime = hlsTime;
        return this;
    }

    public HLSFFmpegBuilder setHlsWrap(Integer hlsWrap) {
        this.hlsWrap = hlsWrap;
        return this;
    }

    public Integer getHlsListSize() {
        return hlsListSize;
    }

    public Integer getHlsTime() {
        return hlsTime;
    }

    public Integer getHlsWrap() {
        return hlsWrap;
    }

    @Override
    public List<String> build() {
        List<String> args = super.build();
        List<String> temp = new ArrayList<>();

        setFormat("hls");

        if(this.hlsWrap != null){
            temp.add("-hls_wrap");
            temp.add(hlsWrap.toString());
        }

        if(this.hlsTime != null){
            temp.add("-hls_time");
            temp.add(hlsTime.toString());
        }

        if(this.hlsListSize != null){
            temp.add("-hls_list_size");
            temp.add(hlsListSize.toString());
        }

        for(String arg: temp){
            args.add(arg);
        }
        List<String> newargs = ImmutableList.copyOf(args);
        return newargs;
    }
}

GkFFmpegBuilder.java

import com.google.common.collect.ImmutableList;
import net.bramp.ffmpeg.builder.FFmpegBuilder;

import java.util.ArrayList;
import java.util.List;

/**
 * 为了方便拓展api中没有的参数
 */

public class GkFFmpegBuilder extends FFmpegBuilder {

    private Long itsoffset;

    @Override
    public List<String> build() {
        // 该数组为不可变数组 （原因未知）
        List<String> args = super.build();
        List<String> temp = new ArrayList<>();
        if(this.itsoffset != null){
            temp.add("-itsoffset");
            temp.add(this.itsoffset.toString());
        }

        for(String arg: args){
            temp.add(arg);
        }
        List<String> newargs = ImmutableList.copyOf(temp);
        return newargs;
    }

    public Long getItsoffset() {
        return itsoffset;
    }

    public GkFFmpegBuilder setItsoffset(Long itsoffset) {
        this.itsoffset = itsoffset;
        return this;
    }

}