Bad DEVC alignment with HERO (2024) files?

[JuanIrache]

Hi.

I'm analysing samples from a HERO (2024) camera and it seems like DEVC packets aren't aligned correctly, or maybe the repeat value in the previous one is not correct. For example, my first DEVC is

{ fourCC: 'DEVC', type: '\x00', size: 1, repeat: 12068 }

But the next DEVC is not at 12076 but at 15000.

Between 12076 and 15000 there are just null values.

The next DEVC is

{ fourCC: 'DEVC', type: '\x00', size: 1, repeat: 11820 }

But the next one is not at 26836 but at 30000, so they seem to be aligned every 15000.

Maybe there is a flag somewhere that indicates this and I'm missing it, not sure.

If necessary I can share sample files privately.

Thanks.

[dnewman-gpsw]

I'm not seeing this in the in header where you do have back to back DEVC payloads. In the streaming payload, I do see zeros after the GPMF/DEVC data, but that is allowed. NULL is valid GPMF terminator. I do see the some laziness in the MP4, just using a crude sized payload size of 15000. Lazy, not wrong.