Hi pskink,

  4:ftyp
 

32:mdat
 

324042:ftyp
 

324070:moov



 Ok 4 is starting bytes of ftyp, 324070 is starting bytes of moov, 32 is 
starting bytes of mdat etc.

so it means that subtract the starting position of mdat  from starting position 
of moov. then converts the bytes to hexadecimal form. that is our offset.

moov - mdat == offset
324070 - 32 == 0x0004f1c6

but if it is true, then our moov starting bytes changes every time how can find 
that?

Regards,

umer



> Date: Fri, 3 Feb 2012 09:43:07 -0800
> Subject: [android-developers] Re: Encoder???
> From: [email protected]
> To: [email protected]
> 
> 
> 
> Muhammad UMER wrote:
> > Basically i don't understand perfectly this,
> >
> > 00000000  0000001c66747970 3367703400000300  |....ftyp3gp4....     |
> > 00000010  336770346d703431 336770360007a42f   |3gp4mp413gp6.../|
> > 00000020  6d6461743c911716 be6679e1e001e7af   |mdat<....fy.....      |
> >
> > can  you please explain it. Thanks
> >
> > Regards,
> > umer
> >
> >
> >
> 
> this shows the complete header (32 bytes) of the modified file
> 
> pskink
> 
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