hi pskink,
So as i understand that relative offset is the reference of the moov atom
(where the moov atom starts in a file). isn't it?
and
How can you calculate this offset,
324070 - 32 == 0x0004f1c6
What is 32 and how 0x0004f1c6 comes?
have you done this, through programming?
Regards,
umer
> Date: Thu, 2 Feb 2012 01:35:02 -0800
> Subject: [android-developers] Re: Encoder???
> From: psk...@gmail.com
> To: android-developers@googlegroups.com
>
> On 2 Lut, 08:32, Muhammad UMER <muhammad.ume...@hotmail.com> wrote:
> > Hi pskink,
> >
> > I have searched the moov atoms,
> >
> > The moov atoms in
> > the file (created by mediarecorder VIDEO0002.3GP) is at the end of the file
> > and ftyp at the beginning. As I attached the image VIDEO0002.png
> > And the moov atoms
> > in the file (created by server) is also at the end of the file along with
> > ftyp.
> > As I attached the image VIDEO.png
> > The 3gp file consists of ftyp-moov-mdat or
> > ftyp-mdat-moov order.
> >
> > So I realize that my server have to write just ftyp at
> > the beginning of the file. Please correct me if I am wrong.
> > Regards,
> > umer
>
> as i said before:
>
> "as you can see you have to modify first 32 bytes: where bytes
> [0..27]
> you can just copy and bytes [28.. 31] should contain the offset
> where
> moov atom starts"
>
> just copy first 28 bytes without any modifications and bytes [28.. 31]
> should contain the offset where moov atom starts - its relative to
> mdat atom e.g:
>
> this is after modification my server_file.3gp file:
>
> #grep -aobE "ftyp|mdat|moov" server_file.3gp
> 4:ftyp
> 32:mdat
> 324042:ftyp
> 324070:moov
>
> so bytes [28.. 31] - the relative offset should be:
> 324070 - 32 == 0x0004f1c6
>
> #hexdump -C server_file.3gp | less
> 00000000 0000001c667479703367703400000300 |....ftyp3gp4....|
> 00000010 336770346d703431336770360004f1c6 |3gp4mp413gp6....|
>
> see 0004f1c6 at the end - its your offset
>
> pskink
>
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