I have a 800mb wma file that I need to split into multiple files programmatically on the fly by specifying a start and end point in bytes.
I tried doing it by reading a file into a file stream and then writing it back out changing the start position like this.
Stream GetAudioPiece(Guid key, int start, int stop)
{
FileStream Book = new FileStream("d:\\war_peace.
int partSize = stop - start;
FileStream Part = new FileStream("d:\\war_part.w
byte[] buffer = new byte[partSize];
int data = 0;
Book.Position = (long)start;
data = Book.Read(buffer, 0, partSize);
Part.Write(buffer, 0, data);
Part.Close();
FileStream retValue = File.OpenRead("d:\\war_par
return retValue;
}
This didn't work. I read somewhere that is because WMA files have headers that are required. So, the question is: How do I read the header from the original file and attach it to the piece I want to stream back?
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kpkp,
I understand wht you are saying but that does not answer the question. I know it can be done, there are a number of commercially available products which allow the splitting of a wma/mp3 file into smaller files. *How* they do it, I don't know. Your first link takes me to a page that has information about SDK's. Has anyone used any of these SDK's to do something like what I'm looking to do?
Sure, I wasn't saying it couldn't be done - just trying to explain why your approach wouldn't work.
There is at least one open source (GPL) .NET application that can split windows media files - Movica (http://vani.bhargav.googl
But I believe it uses a non open source tool called AsfBin (http://radioactivepages.c
Have you considered converting your audio file into a simpler format to work with? Something like AU (http://en.wikipedia.org/w
Again, I know none of this directly answers your question - just trying to be helpful.
For anyone intersted, here's how you do it.
Go to microsoft and download the Windows Media Encoder SDK.
Add a reference to WMEncoderLib.dll
WMEncBasicEdit BasicEdit = new WMEncBasicEdit();
BasicEdit.MediaFile = "source.wma";
BasicEdit.OutputFile = "destination.wma";
BasicEdit.MarkIn = 1200 // time in miliseconds
BasicEdit.MarkOut = 18000 //time in miliseconds
BasicEdit.Start();
That's it. It's that simple.
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by: kpkpPosted on 2008-04-08 at 06:32:06ID: 21304989
Your code doesn't work beacause a WMA file can not simply be split in this way.
Reading the file header and attaching it to the pieces will not help. The WMA file format it a complex proprietary format developed by Microsoft, it is a type of ASF (Advanced Sstem Format) file - documented here http://www.microsoft.com/w
You would have to read and understand the complete specification before attempting to write code to split a WMA file. There may also be licencing issues, see here http://www.microsoft.com/w