JavaCV implements the merger of multiple MP4 videos

<dependency>
    <groupId></groupId>
    <artifactId>javacv</artifactId>
    <version>1.5.1</version>
</dependency>
<!-- Video processing package -->
<dependency>
    <groupId></groupId>
    <artifactId>ffmpeg-platform</artifactId>
    <version>4.1.3-1.5.1</version>
</dependency>

package ;
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import ;
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import static .AV_LOG_ERROR;


@SpringBootTest
public class MP4Test {

    public static void main(String[] args) throws ,  {
        List<String> file = new ArrayList<>();
        // Add mp4 files that need to be merged        ("C:\Users\Administrator\Desktop\1\source\1.mp4");
        ("C:\Users\Administrator\Desktop\1\source\2.mp4");
        long start = ();
        // Merge        videoMerge(file, "C:\Users\Administrator\Desktop\1\1\5.mp4");
        // Statistical time-consuming        ("time consuming" + (() - start) + "millisecond");
    }

    /**
      * Merge of multiple videos
      *
      * @param videoList Address Collection
      * @param output The combined video output address
      */
    public static void videoMerge(List<String> videoList, String output) throws ,  {
        // Frame grabber starts crawling based on the first video        FFmpegFrameGrabber grabber = new FFmpegFrameGrabber((0));
        // Load        ();
        // Configure frame decoder        FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(output, (),
                (), 0);
        // Video codec        (avcodec.AV_CODEC_ID_H264);
        (avcodec.AV_CODEC_ID_AAC); // Set up the audio codec        // Single channel        (1);
        (true);
        // Output stream encapsulation format        ("mp4");
        // Video frame rate        (());
        // Set log output (error)        avutil.av_log_set_level(AV_LOG_ERROR);
        // Set resolution format yuv420p        (avutil.AV_PIX_FMT_YUV420P);
        // Set the video bit rate        (());
        // Audio bit rate        (()); // Set the audio bit rate        // Start coding        ();

        // Loop setting        for (String videoPath : videoList) {
            try (FFmpegFrameGrabber grabberTemp = new FFmpegFrameGrabber(videoPath)) {
                ();
                //Set the frame                Frame frame;
                while ((frame = ()) != null) {
                    (frame);
                }

                // Process audio frames                Frame audioFrame;
                while ((audioFrame = ()) != null) {
                    (audioFrame);
                }
            } catch ( e) {
                ("Error grabbing frames from video: " + videoPath);
                ();
            }
        }
        // Turn off the frame codec        ();
        ();
    }
}