[Roy Simon]

It would be nice if camera manufacturers would all talk apples to apples.

Nikon states;

https://imaging.nikon.com/lineup/dslr/d4/pdf/d4_12p.pdf

video is (H.264/MPEG-4 Advanced Video Coding)

For Canon;

https://www.usa.canon.com/cusa/professional/products/professional_cameras/digital_slr_cameras/eos_1d_x#Specifications

Video specs are;(MOV (image data: H.264; audio: Linear PCM)

Further;

https://wideopencamera.com/just-the-cut/canon-1d-x-what-the-compression

(The biggest change to the movie shooting is the ability to choose from two different compression methods — IPB or ALL-I — depending on your needs. The EOS-1D X still records movies using the H.264 codec but it is the compression type within this codec that has been changed.)

So how do these compare? Is Nikons claim of HDMI different than Canons claim of ALL-I uncompressed HD video? Some direct comparison would be nice!