MP3持续时间Java [英] MP3 Duration Java

问题描述

尝试获取一组MP3的准确时间非常麻烦.我具有使用 MP3SPI 1.9.5库生成的以下属性.

Having an awful time trying to get the accurate time for a set of MP3s. I have these following properties that are generated using the MP3SPI 1.9.5 library.

//      mp3.crc=true
//      mp3.copyright=true
//      mp3.padding=false
//      mp3.channels=1
//      mp3.version.mpeg=2.5
//      mp3.length.bytes=6425480
//      mp3.framerate.fps=27.777779
//      mp3.framesize.bytes=140
//      duration=1606356000
//      mp3.version.layer=3
//      mp3.length.frames=44621
//      mp3.frequency.hz=8000
//      mp3.header.pos=0
//      mp3.bitrate.nominal.bps=16000
//      mp3.vbr.scale=0
//      mp3.version.encoding=MPEG2DOT5L3
//      mp3.mode=3
//      mp3.vbr=false
//      mp3.original=false

现在我正在读取的文件的持续时间由iTunes报告为47:35，而使用Mac Preview的持续时间为48:50.

Now the file I am reading has a duration of 47:35 as reported by iTunes, and 48:50 using Mac Preview.

当我使用库获得Java的持续时间时，我得到26:46:

When I get the duration in Java using the library I get 26:46:

AudioFileFormat fileFormat = AudioSystem.getAudioFileFormat(f);
            Map<?, ?> properties = ((TAudioFileFormat) fileFormat).properties();
            String key = "duration";
            long duration = ((Long) properties.get("duration")) / 1000;
            {
                String frameBased = String.format("Duration Tag: %d hours, %d min, %d sec",
                        TimeUnit.MILLISECONDS.toHours(duration),
                        TimeUnit.MILLISECONDS.toMinutes(duration),
                        TimeUnit.MILLISECONDS.toSeconds(duration) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(duration))
                    );
                    System.out.println(frameBased);
            }

我运气不太好，所以我想知道我是不是在做一些愚蠢的事情，或者我是否可以使用MP3标签中的信息来计算我的实际身高?鉴于iTunes正确地报告了它，我认为我应该能够.

I'm not having much luck, so I was wondering if I'm doing something dumb, or if I can use the information within the MP3 tags to calculate my actual length? Given iTunes is reporting it correctly I assume I should be able to.

推荐答案

鉴于iTunes正确报告了它，我想我应该能够这样做.

Given iTunes is reporting it correctly I assume I should be able to.

一种确定轨道长度的故障保护方法是将其转换为标准的AudioInputStream，然后测量AIS.

One fail-safe way to determine the length of the track is to convert it into a standard AudioInputStream and then measure the AIS.

或者，根据@Kilian Foth的评论:

Or, as per the comment of @Kilian Foth:

不幸的是，这也是 only 故障安全方法.

这篇关于MP3持续时间Java的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！