[Gambas-user] Music.Length

[Lee McPherson]

I've been working on this for mp3 files.  It is really easy to just use 
an external app to get the length of normal bitrate mp3 files as Stefano 
suggested.  For variable bitrate mp3s, it's a little harder.  There are 
visual basic scripts on the web that can do this... I have them 
somewhere in my files.  If I can find them, I'll share them.

However, it's not perfect.  From what I remember, it goes through each 
frame of the mp3 and calculates an average length for each frame, to 
give you an approximate time length for the whole mp3.  So seeking in 
that track will not work correctly, but it doesn't work perfectly in any 
player as far as I know.  I never finished coding this into my own app 
though (which plays mp3 files from MySQL somewhat like Amarok does, but 
using VLC player). 

-Lee

Benoit Minisini wrote:
> On vendredi 20 juin 2008, Benoit Minisini wrote:
>   
>> On vendredi 20 juin 2008, Patrik Karlsson wrote:
>>     
>>> Hello, I'm about to port an old Delphiapp to a nicer environment and
>>> I'm looking at Gambas to do the work, Gambas is realy nice!
>>>
>>> One function I used in Delphi was to get the length of the sound
>>> played in TMediaPlayer, since I would like things done after 80%,
>>> 90%...
>>> Music.Pos tells me where I am, but I can not found a function that
>>> tells me how far I have to go.
>>>
>>> Is there a solution to this?
>>>       
>> Alas, if I remember correctly, the SDL library has no method to know the
>> length of the music! I don't know if it has changed recently, I will
>> check...
>>     
>
> Apparently, SDL cannot extract the audio length from some formats, like MP3 
> with a variable bitrate stream.
>
> I don't know why apparently the length of the audio is not encoded in the file 
> header...
>
>