java - 如何从 Java 程序中正确调用 mkvmerge？

Question

我有几百集的动漫，我想将其字幕和视频文件合并为一个。我决定编写一个简短的 Java 程序来遍历文件并合并它们。视频文件名为 Bleach1.mkv，字幕为 Bleach1.s​​rt。为了避免任何潜在的空间问题，文件保存在我的 C 驱动器的根目录下。我写的代码如下。

根据 mkvmerge 的文档，适当的命令行调用是“mkvmerge -o remux_Bleach1.mkv Bleach1.mkv Bleach1.s​​rt”。我已经确认，这确实有效。我现在正在从不同的文件夹运行 java 程序，所以我为每个文件使用了绝对路径。

我的代码中的命令打印为“[C:\Program Files\MKVToolNix\mkvmerge.exe, -o C:\Bleach\remux_Bleach_1.mkv C:\Bleach\Bleach_1.mkv C:\Bleach\Bleach_1 .srt]"

我从 mkvmerge 返回的错误消息是“错误:未给出目标文件名。”

我不明白在使用 ProcessBuilder 时参数是如何传递的——我做错了什么？

import org.apache.commons.io.FilenameUtils;

import java.io.*;
import java.util.ArrayList;
import java.util.List;


public class Main {

    private static String mkvmergePath = "C:\\Program Files\\MKVToolNix\\mkvmerge.exe";

    public static void mergeVideoAndSubtitles(final File folder, String videoExtension, String subtitleExtension) {
        for (final File fileEntry : folder.listFiles()) {
            if (fileEntry.isDirectory()) {
                listFilesForFolder(fileEntry, videoExtension, subtitleExtension);
                // for each mkv file that is found
            } else if (FilenameUtils.isExtension(fileEntry.getName(), videoExtension)) {
                String parentFolderPath = fileEntry.getParentFile().getPath();
                String baseName = FilenameUtils.getBaseName(fileEntry.getName());
                String outputFileAbsolutePath = parentFolderPath + "\\remux_" + fileEntry.getName();
                String inputVideoAbsolutePath = fileEntry.getAbsolutePath();
                String inputSubtitleAbsolutePath = parentFolderPath + "\\" + baseName + "." + subtitleExtension;
                String param1 = "-o " + outputFileAbsolutePath + " " + inputVideoAbsolutePath + " " + 
                        inputSubtitleAbsolutePath;
//                String param2 = "--default-track \"und\"";
//                String param3 = "--language 0:und " + baseName + "." + subtitleExtension + "\"";
//                System.out.println(param1);
//                System.out.println(param2);
//                System.out.println(param3);
                BufferedReader br = null;
                String line;
                try {
                List<String> list = new ArrayList<String>();
                list.add(mkvmergePath);
                list.add(param1);

                ProcessBuilder build = new ProcessBuilder(list);
                    System.out.println(build.command());
                                        Process process = build.start();

                    InputStream is = process.getInputStream();
                    InputStreamReader isr = new InputStreamReader(is);
                    br = new BufferedReader(isr);

                    while ((line = br.readLine()) != null) {
                        System.out.println(line);
                    }

                } catch (IOException e) {
                    e.printStackTrace();
                }


            }
        }
    }

    public static void main(String[] args) {
        final File folder = new File("C:\\Bleach");
        mergeVideoAndSubtitles(folder, "mkv", "srt");
    }
}

Answer 1

我在用 Go 编写一个类似的程序时遇到了同样的错误。显然参数中的空格(例如 --language 0:eng)导致了这个问题。我试图将它们分成单独的参数，它似乎有效:

public static void main(String[] args) throws IOException {
    String mkvmerge = "C:\\Program Files\\MKVToolNix\\mkvmerge.exe";

    List<String> command = new ArrayList<String>();
    command.add(mkvmerge);

    command.add("--ui-language");
    command.add("en");
    command.add("--output");
    command.add("D:\\Dump\\test.mkv");
    command.add("--language");
    command.add("0:eng");
    command.add("--default-track");
    command.add("0:yes");
    command.add("--language");
    command.add("1:eng");
    command.add("--default-track");
    command.add("1:yes");
    command.add("--language");
    command.add("2:eng");
    command.add("D:\\Dump\\Game of Thrones\\Game.of.Thrones.S01.1080p.WEB-DL.DD5.1.H.264-SA89[rartv]\\Game.of.Thrones.S01E01.Winter.Is.Coming.1080p.WEB-DL.DD5.1.H.264-SA89.mkv");
    command.add("--sub-charset");
    command.add("0:UTF-8");
    command.add("--language");
    command.add("0:eng");
    command.add("D:\\Dump\\Game of Thrones\\Game.of.Thrones.S01.1080p.WEB-DL.DD5.1.H.264-SA89[rartv]\\Subs\\Game.of.Thrones.S01E01.Winter.Is.Coming.1080p.WEB-DL.DD5.1.H.264-SA89.srt");
    command.add("--track-order");
    command.add("0:0,0:1,0:2,1:0");

    ProcessBuilder builder = new ProcessBuilder(command);
    builder.redirectErrorStream(true);
    Process process = builder.start();

    BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
    String line = null;
    while ((line = reader.readLine()) != null) {
        System.out.println(line);
    }
}

出于某种原因，这不适用于路径中的空格。这在 Go 中也适用。