[SOLVED] Edited mp3 file became longer?

[Member kaye]

Hello Friends!

I have an mp3 file named e.mp3

If I play it in XMMS, I can see that it is two minutes and forty five seconds long (2:45).

I added fade out effect with this command:

ffmpeg -i e.mp3 -af “afade=t=out:st=160:d=6” e2.mp3

Notice I saved the new file as e2.mp3

If I play this new file, XMMS now shows the song to be five minutes and thirty seconds long (5:30)

Nothing wrong with the audio though, it still sounds great. And the music still stops at 2:45, even though XMMS is showing that it’s 5:30

If I play this edited song in Quod Libet, the duration of the song is correctly indicated as 2:45

Not a big deal to me, I was just wondering what you guys think about that.

Thanks!!!

• This topic was modified 2 years, 11 months ago by kaye.
• This topic was modified 2 years, 11 months ago by kaye.

[Forum Admin SamK]

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kaye wrote:

If I play it in XMMS, I can see that it is two minutes and forty five seconds long (2:45).

I added fade out effect…

XMMS now shows the song to be five minutes and thirty seconds long (5:30)

…the music still stops at 2:45, even though XMMS is showing that it’s 5:30

There is not a simple answer to that because there are many possible causes. A web search about different reported MP3 file lengths will turn up a large number of posts.

Some generalities…

• Constant bit rate (CBR) MP3 files do not exhibit this behaviour.

• Variable bit rate (VBR) MP3 files can show this length discrepancy.

• The wide range of MP3 encoders can produce different results.

• Sometimes the VBR id information is not added to the file. That can be fixed with apps such as vbrfix, mp3-diags, kid3-qt.

• Some reports indicate the manner in which the MP3 file tags are created may be an influence.

• Music playing apps have different abilities to handle VBR files. Recent players tend to do it better than older ones.

The benefits/quality of VBR v CBR can generate heated opinions. These tend to be theoretical v real world actual. Be guided by your own hearing experiences/abilities.

One way to avoid the reported MP3 file length discrepancies, on all music playing apps, is to ensure they are encoded using a relatively high CBR. You may be surprised by how small is the perceived difference (if any at all) compared to VBR.

[Member kaye]

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thank you!

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