I believe the HDMI on the 70D is 4:2:0 I don’t know the answer about the C100 without googling.
“External Monitoring & Recording
The EOS C100 features an industry standard HDMI port that can be used for either external monitoring or external recording purposes. This HDMI connector also contains an HDMI lock mechanism (for compatible HDMI cables), and is capable of outputting an 8-bit uncompressed signal.
When used to monitor or record to an external display, the uncompressed signal can carry industry standard timecode as either metadata in the video stream or as a superimposed timecode burn directly into the video footage. This latter feature is ideal for situations like recording legal depositions where this feature is oftentimes a requirement of the production.”
Warren Eig
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