记录linux上面遇到ffmpeg海康视频转码问题

1、terminal 执行正常的ffmpeg同一条命令行语句，Java 调用报错no such file or directory。
既然 terminal 可以成功执行，启动 shell，然后自定义命令行作为参数传递给 shell 解释器。shell 知道如何将程序员的意图转达给底层。使用 sh -c，将自定义 CMD 行作为其参数，最后使用 java.lang.Runtimeexec(String[] cmdarray)：

Runtime.getRuntime().exec(new String[]{“sh”,"-c",command})

2、获取转码进程跟杀死转码进程。
mport com.sun.jna.Platform;
import com.sun.jna.examples.win32.Kernel32;
import com.sun.jna.examples.win32.W32API;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.reflect.Field;

@Slf4j
public class ProcessLinuxUtil {

public static String getProcessId(Process process) {
    long pid = -1;
    Field field = null;
    if (Platform.isWindows()) {
        try {
            field = process.getClass().getDeclaredField("handle");
            field.setAccessible(true);
            pid = Kernel32.INSTANCE.GetProcessId((W32API.HANDLE) field.get(process));
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    } else if (Platform.isLinux()) {
        try {
            Class<?> clazz = Class.forName("java.lang.UNIXProcess");
            field = clazz.getDeclaredField("pid");
            field.setAccessible(true);
            pid = (Integer) field.get(process);
        } catch (Throwable e) {
            e.printStackTrace();
        }
    }
    log.info("-------------pid:"+pid);
    return String.valueOf(pid);
}

/**
 * 关闭Linux进程
 *
 * @param pid 进程的PID
 */
public static boolean killProcessByPid(String pid) {
    if (StringUtils.isEmpty(pid) || "-1".equals(pid)) {
        throw new RuntimeException("Pid ==" + pid);
    }
    Process process = null;
    BufferedReader reader = null;
    String command = "";
    boolean result = false;
    if (Platform.isWindows()) {
        command = "cmd.exe /c taskkill /PID " + pid + " /F /T ";
    } else if (Platform.isLinux()) {
        command = "kill -9 " + pid;
    }
    try {
        //杀掉进程
        process = Runtime.getRuntime().exec(command);
        reader = new BufferedReader(new InputStreamReader(process.getInputStream(), "utf-8"));
        String line = null;
        while ((line = reader.readLine()) != null) {
            log.info("kill PID return info -----> " + line);
        }
        result = true;
    } catch (Exception e) {
        log.info("杀进程出错：", e);
        result = false;
    } finally {
        if (process != null) {
            process.destroy();
        }
        if (reader != null) {
            try {
                reader.close();
            } catch (IOException e) {

            }
        }
    }
    return result;
}

}