<dependency>
    <groupId>com.github.vip-zpf</groupId>
    <artifactId>jave</artifactId>
    <version>1.0.9</version>
</dependency>

 public static long readVideoTimeMs(MultipartFile file) {
        Encoder encoder = new Encoder();
        long ms = 0;
        try {
            // 获取文件类型
            String fileName = file.getContentType();
            // 获取文件后缀
            String pref = fileName.indexOf("/") != -1 ? fileName.substring(fileName.lastIndexOf("/") + 1, fileName.length()) : null;
            String prefix = "." + pref;
            // 用uuid作为文件名，防止生成的临时文件重复
            final File excelFile = File.createTempFile(UUID.randomUUID().toString().replace("-", ""), prefix);
            // MultipartFile to File
            file.transferTo(excelFile);
            MultimediaInfo m = encoder.getInfo(excelFile);
            ms = m.getDuration();
            //程序结束时，删除临时文件
            VideoUtil.deleteFile(excelFile);
        } catch (Exception e) {
            e.printStackTrace();
        }

        long seconds = ms/1000;
        return seconds;
    }

    /**
     *  删除文件
     */
    private static void deleteFile(File... files) {
        for (File file : files) {
            if (file.exists()) {
                file.delete();
            }
        }
    }
}