Read ID3 tags without downloading the whole file

问题

Is it possible to read ID3 tags (Duration, Artist, title...) of an MP3 file without having to download the whole file?

I did a few tests and I was able to get the Artist and title tags with only downloading a few bytes of the MP3 file.. but I'm not sure if it's possible for Duration and other tags..

Thanks.

回答1:

I just find out that ffmpeg can read ID3 tags of a remote file without having to download the whole file:

root@local1:/# ffmpeg -i http://physics.ujep.cz/~mmaly/mp3/Mozart/Mass_in_C_Minor_New_by_Levin/sbory_vyssi_kvalita/01_Kyrie.mp3
FFmpeg version 0.6-4:0.6-2ubuntu6, Copyright (c) 2000-2010 the FFmpeg developers
  built on Oct  5 2010 22:36:53 with gcc 4.4.5
  configuration: --extra-version=4:0.6-2ubuntu6 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-vaapi --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-gpl --enable-postproc --enable-x11grab --enable-libdc1394 --enable-shared --disable-static
  libavutil     50.15. 1 / 50.15. 1
  libavcodec    52.72. 2 / 52.72. 2
  libavformat   52.64. 2 / 52.64. 2
  libavdevice   52. 2. 0 / 52. 2. 0
  libavfilter    1.19. 0 /  1.19. 0
  libswscale     0.11. 0 /  0.11. 0
  libpostproc   51. 2. 0 / 51. 2. 0
[mp3 @ 0x7ae420]max_analyze_duration reached
[mp3 @ 0x7ae420]Estimating duration from bitrate, this may be inaccurate
Input #0, mp3, from 'http://physics.ujep.cz/~mmaly/mp3/Mozart/Mass_in_C_Minor_New_by_Levin/sbory_vyssi_kvalita/01_Kyrie.mp3':
  Metadata:
    TLEN            : 431046
    TIT2            : Kyrie
    TRCK            : 1
    TPE1            : Mozart
    TCON            : Classical
    TALB            : Mass in C Minor New by Levin
  Duration: 00:07:11.18, start: 0.000000, bitrate: 128 kb/s
    Stream #0.0: Audio: mp3, 44100 Hz, 2 channels, s16, 128 kb/s
At least one output file must be specified

回答2:

Depends on if you want to read ID3v1 or ID3v2. ID3v1 is always at the end of the file, so if you are interested in reading that no go. ID3v2 usually occurs at the start of the file, but there's no guarantee for that.

So if you don't want to accidentally miss any tags, you have to read the whole file. The ID3v1 problem can be solved by reading from the end of the file, but that doesn't help with ID3v2.

来源：https://stackoverflow.com/questions/5359279/read-id3-tags-without-downloading-the-whole-file