[MP4Box] Feature request: support for Motion JPEG 2000 specific boxes

[boxerab]

Thank you for this excellent MP4 toolkit. I am interested in dumping boxes for motion jpeg 2000 files.
MP4Box can parse almost all boxes, except for a handful :

[iso file] Unknown top-level box type jP  
[iso file] Unknown box type jp2p in parent mjp2
[iso file] Unknown box type jsub in parent mjp2
[iso file] Unknown box type orfo in parent mjp2

The boxes do appear in the xml, but the contents are not interpreted correctly.

<UnknownBox Size="20" Type="jp2p" Specification="unknown" Container="unknown" data="0x000000006A7032204A325030" >
</UnknownBox>
<UnknownBox Size="12" Type="jsub" Specification="unknown" Container="unknown" data="0x02020000" >
</UnknownBox>
<UnknownBox Size="10" Type="orfo" Specification="unknown" Container="unknown" data="0x0100" >

jP is the signature box
jp2p is the profile box
jsub is the subsampling box
orfo is the original format box

Adding link to final draft of MJ2 spec

[rbouqueau]

Thank you! By any chance would you have some sample files to share with us?

[boxerab]

My pleasure! Here is a sample file

Speedway.zip

[boxerab]

I notice that orfo box is not mentioned in the final draft. This box contains two bytes -

• first byte stores field count i.e. progressive (1) or interlaced (2)
• second byte stores field order: TFF (1) or BFF (6), and only relevant for interlaced

[DenizUgur]

I see conflicting information on orfo. It's not clear if the files are signed or not. Do we have access to the latest specification? It shouldn't matter if values are that small but just for completeness sake.

[boxerab]

Thanks, @DenizUgur . Unfortunately I don't have enough Swiss francs to purchase the latest spec. Let me do some more digging on that issue.

[DenizUgur]

While you are at it, I see that signature box should be jP2 and don't see anything about jP . Is that an alternative?

[boxerab]

@DenizUgur, I have looked at MJ2 implementations, and this is what I found for orfo box.

  uint8_t or_fieldcount_;
  uint8_t or_fieldorder_;

Also, jp is the signature box, while jp2 is the "brand" of the file

[boxerab]

Thanks @rbouqueau @DenizUgur @jeanlf !! Looking forward to trying this with nightly build.