java - 将 .srt 文件分割成相等的 block

Question

我是新手，我需要将 Srt(字幕文件)分成多个 block 。

例如:如果我有一个视频的字幕文件(60 分钟)。然后将字幕文件分割成6个字幕文件，每个字幕文件10分钟。

即 6 X 10 = 60 分钟

无论分钟如何，都需要分为 6 个 block 。

使用每个字幕时间/持续时间，我必须将视频分成相同的 block 。

我正在尝试这段代码，你能帮我看看如何计算时间并分成 block 吗，

我能够实现我需要多少分钟的chuck。但是陷入如何从源文件中读取该chunk分钟并创建一个新文件。然后如何从源文件的接下来10分钟开始下一个 block 。

import org.apache.commons.io.IOUtils;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.stream.Stream;

/**
 * The class SyncSRTSubtitles reads a subtitles .SRT file and offsets all the
 * timestamps with the same specific value in msec.
 *
 * The format of the .SRT file is like this:
 *
 * 123
 * 00:11:23,456 --> 00:11:25,234
 * subtitle #123 text here
 *
 *
 * @author Sorinel CRISTESCU
 */
public class SyncSRTSubtitles {

    /**
     * Entry point in the program.
     *
     * @param args
     * @throws IOException
     */
    public static void main(String[] args) throws IOException {

        /* INPUT: offset value: negative = less (-) ... positive = more (+). */
        long delta = (22 * 1000L + 000); /* msec */


        /* INPUT: source & destination files */
        String srcFileNm = "/Users/meh/Desktop/avatar.srt";
        String destFileNm = "/Users/meh/Desktop/avatar1.srt";


        /* offset algorithm: START */
        File outFile = new File(destFileNm);
        outFile.createNewFile();
        FileWriter ofstream = new FileWriter(outFile);
        BufferedWriter out = new BufferedWriter(ofstream);

        /* Open the file that is the first command line parameter */
        FileInputStream fstream = new FileInputStream(srcFileNm);
        DataInputStream in = new DataInputStream(fstream);
        BufferedReader br = new BufferedReader(new InputStreamReader(in));
        String strLine;
//        List<String> doc = IOUtils.readLines(in, StandardCharsets.UTF_8);


String strEnd = null;
        long diff = 0;
        String line;
        String startTS1;
        try (Stream<String> lines = Files.lines(Paths.get(srcFileNm))) {
            line = lines.skip(1).findFirst().get();
            String[] atoms = line.split(" --> ");
             startTS1 = atoms[0];

        }
        System.out.println("bolo:" +line);
        System.out.println("startTS1:" +startTS1);

        String startTS = null;
        String endTS = null;
        /* Read File Line By Line */
        while ((strLine = br.readLine()) != null) {
            String[] atoms = strLine.split(" --> ");
            if (atoms.length == 1) {
                //out.write(strLine + "\n");
            }
            else {
                 startTS = atoms[0];


                 endTS = atoms[1];
//                out.write(offsetTime(startTS, delta) + " --> "
//                    + offsetTime(endTS, delta) + "\n");
                strEnd = endTS;

            }


        }
        try {
            SimpleDateFormat dateFormat = new SimpleDateFormat("hh:mm:ss");
            Date parsedendDate = dateFormat.parse(strEnd);
            Date parsedStartDate = dateFormat.parse(startTS1);
            diff = parsedendDate.getTime() - parsedStartDate.getTime();

        } catch(Exception e) { //this generic but you can control another types of exception
            // look the origin of excption
        }
        System.out.println("strEnd");
        System.out.println(strEnd);
        /* Close the input streams */
        in.close();
        out.close();
        System.out.println(diff);
        long diff1 =diff/6;
        System.out.println(diff1);
        long diff2= (diff1*6);
        System.out.println(diff2);
        System.out.println((diff / 3600000) + " hour/s " + (diff % 3600000) / 60000 + " minutes");
        System.out.println((diff1 / 3600000) + " hour/s " + (diff1 % 3600000) / 60000 + " minutes");
        System.out.println((diff2 / 3600000) + " hour/s " + (diff2 % 3600000) / 60000 + " minutes");

        /* offset algorithm: END */
        System.out.println("DONE! Check the rsult oin the file: " + destFileNm);
    }

    /**
     * Computes the timestamp offset.
     *
     * @param ts
     *            String value of the timestamp in format: "hh:MM:ss,mmm"
     * @param delta
     *            long value of the offset in msec (positive or negative).
     * @return String with the new timestamp representation.
     */
    private static String offsetTime(String ts, long delta) {
        long tsMsec = 0;
        String atoms[] = ts.split("\\,");
        if (atoms.length == 2) {
            tsMsec += Integer.parseInt(atoms[1]);
        }
        atoms = atoms[0].split(":");

        tsMsec += Integer.parseInt(atoms[2]) * 1000L; /* seconds */
        tsMsec += Integer.parseInt(atoms[1]) * 60000L; /* minutes */
        tsMsec += Integer.parseInt(atoms[0]) * 3600000L; /* hours */
        tsMsec += delta; /* here we do the offset. */

        long h = tsMsec / 3600000L;
        System.out.println(h);

        String result = get2digit(h, 2) + ":";

        System.out.println(result);


        long r = tsMsec % 3600000L;
        System.out.println(r);

        long m = r / 60000L;
        System.out.println(m);

        result += get2digit(m, 2) + ":";
        System.out.println(result);
        r = r % 60000L;
        System.out.println(r);

        long s = r / 1000L;
        result += get2digit(s, 2) + ",";

        result += get2digit(r % 1000L, 3);
        System.out.println(result);

        return result;
    }

    /**
     * Gets the string representation of the number, adding the prefix '0' to
     * have the required length.
     *
     * @param n
     *            long number to convert to string.
     * @param digits
     *            int number of digits required.
     * @return String with the required length string (3 for digits = 3 -->
     *         "003")
     */
    private static String get2digit(long n, int digits) {
        String result = "" + n;
        while (result.length() < digits) {
            result = "0" + result;
        }
        return result;
    }

}

请建议我如何实现这一目标？

Answer 1

您需要解析该文件两次:

• 一次读取最后结束时间
• 第二次处理所有行并生成输出文件。

    import java.io.BufferedWriter;
    import java.io.File;
    import java.io.FileWriter;
    import java.io.IOException;
    import java.util.List;

    import org.apache.commons.io.FileUtils;

    public class SplitSRTFiles {

        /**
         * Splits a SRT file in multiple files each containing an equal time duration.
         * @param args
         * [0] number of wanted chunks
         * [1] source file name
         * @throws IOException
         */
        public static void main(String[] args) throws IOException {
            int nrOfChunks = Integer.parseInt(args[0]);
            File srtFile = new File(args[1]);
            System.out.println("Splitting "+srtFile.getAbsolutePath()+" into "+nrOfChunks+" files.");

            List<String> srcLines = FileUtils.readLines(srtFile);
            long fileEndTime = lastEndTime(srcLines);
            long msecsPerChunkFile = fileEndTime / nrOfChunks;
            int destFileCounter = 1;
            String[] fileNameParts = srtFile.getName().split("\\.");
            File outFile = new File(fileNameParts[0] + destFileCounter + "." + fileNameParts[1]);
            System.out.println("Writing to "+outFile.getAbsolutePath());
            outFile.createNewFile();
            FileWriter ofstream = new FileWriter(outFile);
            BufferedWriter out = new BufferedWriter(ofstream);

            for (String line : srcLines) {
                String[] atoms = line.split(" --> ");
                if (atoms.length > 1) {
                    long startTS = toMSec(atoms[0]);
                    // check if start time of this subtitle is after the current
                    // chunk
                    if (startTS > msecsPerChunkFile * destFileCounter) {
                        // close existing file ...
                        out.close();
                        ofstream.close();
                        // ... and start a new file
                        destFileCounter++;
                        outFile = new File(srtFile.getParent(), fileNameParts[0] + destFileCounter + "." + fileNameParts[1]);
                        System.out.println("Writing to "+outFile.getAbsolutePath());
                        outFile.createNewFile();
                        ofstream = new FileWriter(outFile);
                        out = new BufferedWriter(ofstream);
                    }
                }
                out.write(line + "/n");
            }
            out.close();
            ofstream.close();
            System.out.println("Done.");
        }

        /**
         * Calculates the time in msec of the end time of the last subtitle of the
         * file
         * 
         * @param lines
         *            read from file
         * @return end time in milliseconds of the last subtitle
         */
        public static long lastEndTime(List lines) throws IOException {
            String endTS = null;
            for (String line : lines) {
                String[] atoms = line.split(" --> ");
                if (atoms.length > 1) {
                    endTS = atoms[1];
                }
            }
            return endTS == null ? 0L : toMSec(endTS);
        }

        public static long toMSec(String time) {
            long tsMsec = 0;
            String atoms[] = time.split("\\,");
            if (atoms.length == 2) {
                tsMsec += Integer.parseInt(atoms[1]);
            }
            atoms = atoms[0].split(":");

            tsMsec += Integer.parseInt(atoms[2]) * 1000L; /* seconds */
            tsMsec += Integer.parseInt(atoms[1]) * 60000L; /* minutes */
            tsMsec += Integer.parseInt(atoms[0]) * 3600000L; /* hours */
            return tsMsec;
        }
    }