UDTA Content

[AlanKoschel]

Is it possible to read out the udta box with all its content by using the source code? I want to access geo data and calibration data which is placed in the udta box.

[Vargol]

Yes and no :-) Yes it will read the mp4 down to the udta box and the boxes in the udta box as it knows that the udta is a container, but it will not interpret those boxes and does not know if any of those boxes are containers.

So you'll get down to this level with the source as is, the numbers are header size and content size..

└── udta [8, 438193]
     ├── modl [8, 6]
     ├── slno [8, 13]
     ├── fwvr [8, 9]
     ├── clor [8, 3]
     ├── rcid [8, 17]
     ├── scfg [8, 3]
     ├── pmod [8, 3]
     ├── zrdr [8, 1]
     ├── geol [8, 1]
     ├── rcrp [8, 15]
     ├── lcrp [8, 15]
     ├── cali [8, 2173]
     └── bmdt [8, 435830]

[AlanKoschel]

Thank you! By the way is it possible to access the content of the camm atom?

[Vargol]

Pretty much the same answer, according to the google api docs camm is part of the stsd container. I haven't got an example with a camm atom (box) but it knows stsd is a container and will read the boxes within. It doesn't know what to do with the data though :-)

 ├── moov [8, 47764]
 │   ├── mvhd [8, 100]
 │   ├── trak [8, 47550]
 │   │   ├── tkhd [8, 84]
 │   │   ├── edts [8, 28]
 │   │   └── mdia [8, 47414]
 │   │       ├── mdhd [8, 24]
 │   │       ├── hdlr [8, 37]
 │   │       └── minf [8, 47329]
 │   │           ├── vmhd [8, 12]
 │   │           ├── dinf [8, 28]
 │   │           └── stbl [8, 47265]
 │   │               ├── stsd [8, 241]
 │   │               │   └── avc1 [8, 225]
 │   │               │       ├── avcC [8, 45]

[Vargol]

Provided the information requested