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Support calculating approximate duration

See original GitHub issue

Giving the duration: true option makes all media files be fully scanned to calculate their accurate duration, but when a large number of files should be handled, it is enough to get approximate duration of songs; most clients to play them do not trust what the server gives anyway.

How about adding an option like approximate: true to duration: true for approximate duration? As I recall, an old version of musicmetadata did that by assuming CBR when the first three frames have the same bit-rate; I ported that to mp3-duration (

Issue Analytics

  • State:closed
  • Created 6 years ago
  • Comments:5 (3 by maintainers)

github_iconTop GitHub Comments

Borewitcommented, Aug 24, 2017

That could very well be the reason.

On a good quality (using a recent Lame encoder) MP3 encoded file, it will do the duration calculation on the VBR/Xing/Info header. That header specifies the number of frames.

I just removed a silly rounding from that calculation. It is pretty accurate only thing what is missing is subtracting the “empty” space in the very last frame.

Borewitcommented, Sep 4, 2017

@mycoboco, thanks for your reply and promising the benchmark.

Feel free to open an issue for the remaining 6 files or re-open this one.

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