mp3文件的时间长度

在不使用外部库的情况下,确定给定mp3文件的长度(以秒为单位)的最简单方法是什么？(蟒蛇来源高度赞赏)

你可以使用pymad.它是一个外部库,但不适用于Not Invented Here陷阱.你不想要任何外部库的任何特殊原因？

import mad

mf = mad.MadFile("foo.mp3")
track_length_in_milliseconds = mf.total_time()    

发现在这里.

-

如果您真的不想使用外部库,请查看此处并查看他是如何完成的.警告:这很复杂.

对于谷歌粉丝来说,这里有一些外部的库:

mpg321 -t

ffmpeg -i

midentify(基本上是mplayer)请参阅使用mplayer确定音频/视频文件的长度

mencoder(传递它无效的params,它会吐出一条错误信息,但也会给你有关该文件的信息,ex $ mencoder inputfile.mp3 -o fake)

mediainfo计划http://mediainfo.sourceforge.net/en

exiftool

linux"file"命令

mp3info

短袜

refs:https: //superuser.com/questions/36871/linux-command-line-utility-to-determine-mp3-bitrate

http://www.ruby-forum.com/topic/139468

mp3长度,以毫秒为单位

(使其成为其他人添加的维基).

和libs:.net:naudio,java:jlayer,c:libmad

干杯!

简单,用Python解析MP3二进制blob以计算某些东西

这听起来像一个很高的订单.我不知道Python,但这里有一些代码我已经从我曾经尝试过编写的另一个程序中重构过了.

注意:它是用C++编写的(抱歉,这就是我所拥有的).此外,原样,它只处理恒定比特率MPEG 1音频第3层文件.这应该涵盖最多,但我无法保证在所有情况下都可以这样做.希望这可以满足您的需求,并希望将其重构为Python比从头开始更容易.

// determines the duration, in seconds, of an MP3;
// assumes MPEG 1 (not 2 or 2.5) Audio Layer 3 (not 1 or 2)
// constant bit rate (not variable)

#include 
#include 
#include 

using namespace std;

//Bitrates, assuming MPEG 1 Audio Layer 3
const int bitrates[16] = {
         0,  32000,  40000,  48000,  56000,  64000,  80000,   96000,
    112000, 128000, 160000, 192000, 224000, 256000, 320000,       0
  };


//Intel processors are little-endian;
//search Google or see: http://en.wikipedia.org/wiki/Endian
int reverse(int i)
{
    int toReturn = 0;
    toReturn |= ((i & 0x000000FF) << 24);
    toReturn |= ((i & 0x0000FF00) << 8);
    toReturn |= ((i & 0x00FF0000) >> 8);
    toReturn |= ((i & 0xFF000000) >> 24);
    return toReturn;
}

//In short, data in ID3v2 tags are stored as
//"syncsafe integers". This is so the tag info
//isn't mistaken for audio data, and attempted to
//be "played". For more info, have fun Googling it.
int syncsafe(int i)
{
 int toReturn = 0;
 toReturn |= ((i & 0x7F000000) >> 24);
 toReturn |= ((i & 0x007F0000) >>  9);
 toReturn |= ((i & 0x00007F00) <<  6);
 toReturn |= ((i & 0x0000007F) << 21);
 return toReturn;     
}

//How much room does ID3 version 1 tag info
//take up at the end of this file (if any)?
int id3v1size(ifstream& infile)
{
   streampos savePos = infile.tellg(); 

   //get to 128 bytes from file end
   infile.seekg(0, ios::end);
   streampos length = infile.tellg() - (streampos)128;
   infile.seekg(length);

   int size;
   char buffer[3] = {0};
   infile.read(buffer, 3);
   if( buffer[0] == 'T' && buffer[1] == 'A' && buffer[2] == 'G' )
     size = 128; //found tag data
   else
     size = 0; //nothing there

   infile.seekg(savePos);

   return size;

}

//how much room does ID3 version 2 tag info
//take up at the beginning of this file (if any)
int id3v2size(ifstream& infile)
{
   streampos savePos = infile.tellg(); 
   infile.seekg(0, ios::beg);

   char buffer[6] = {0};
   infile.read(buffer, 6);
   if( buffer[0] != 'I' || buffer[1] != 'D' || buffer[2] != '3' )
   {   
       //no tag data
       infile.seekg(savePos);
       return 0;
   }

   int size = 0;
   infile.read(reinterpret_cast(&size), sizeof(size));
   size = syncsafe(size);

   infile.seekg(savePos);
   //"size" doesn't include the 10 byte ID3v2 header
   return size + 10;
}

int main(int argCount, char* argValues[])
{
  //you'll have to change this
  ifstream infile("C:/Music/Bush - Comedown.mp3", ios::binary);

  if(!infile.is_open())
  {
   infile.close();
   cout << "Error opening file" << endl;
   system("PAUSE");
   return 0;
  }

  //determine beginning and end of primary frame data (not ID3 tags)
  infile.seekg(0, ios::end);
  streampos dataEnd = infile.tellg();

  infile.seekg(0, ios::beg);
  streampos dataBegin = 0;

  dataEnd -= id3v1size(infile);
  dataBegin += id3v2size(infile);

  infile.seekg(dataBegin,ios::beg);

  //determine bitrate based on header for first frame of audio data
  int headerBytes = 0;
  infile.read(reinterpret_cast(&headerBytes),sizeof(headerBytes));

  headerBytes = reverse(headerBytes);
  int bitrate = bitrates[(int)((headerBytes >> 12) & 0xF)];

  //calculate duration, in seconds
  int duration = (dataEnd - dataBegin)/(bitrate/8);

  infile.close();

  //print duration in minutes : seconds
  cout << duration/60 << ":" << duration%60 << endl;

  system("PAUSE");
  return 0;
}

$pip install mutagen

from mutagen.mp3 import MP3
audio = MP3(file_path)
print audio.info.length