MPEG 1/2 file structure

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MPEG 1/2 file structure

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MPEG 1/2 file structure

Postby vh4x0r » Mon, 04 Oct 2010 02:26:10 GMT 

Can anyone point me to some article related to the structure of an
MPEG 1/2 video file ? There are lots of sources with information of
the decompression/compression algorithms, but none provide a clear
view of the structure of the bit stream. I have looked into the
libmpeg2 source code, but it's too hand optimized and thereby unclear.
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Similar Threads:

1.MPEG 1/2 file structure 

Can anyone point me to some article related to the structure of an
MPEG 1/2 video file ? There are lots of sources with information of
the decompression/compression algorithms, but none provide a clear
view of the structure of the bit stream. I have looked into the
libmpeg2 source code, but it's too hand optimized and thereby unclear.

2.JPEG/MPEG file structure 

I noticed that viewing some of my JPEG files using Notepad 
the first character is always chr(255).  Is this valid for 
all JPEG files?

I don't have any MPEG files readily available.  What is 
the first character and is it consistent for all MPEG 
files?

What I'm trying to do is read the first character of 
various files to determine what type of file it is without 
using the file extension.  What would be a better solution 
without too much coding?

TIA....  John
---------------------------
Sub ReadFiles()
Dim sFile As String
Dim sBuffer As String
Dim ff As Integer
sFile = Dir("*")
Do While sFile <> ""
    ff = FreeFile
    Open sFile For Binary As #ff
    sBuffer = Space$(1)
    Get #ff, 1, sBuffer
    If sBuffer = Chr(255) Then MsgBox "JPEG File"
    Close #ff
    sFile = Dir
Loop
End sub

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