Answering my own question here in case someone else stumbles into this, it 
turns out those streams were completely broken:

- The CC data SEI NAL units were defined after the primary coded picture which 
violates the H264 standard
- The user data part of SEI was lacking the marker_bits (0xFF) at the end

Both issues were fixed upstream by the Dash industry forum and the public 
samples regenerated after the report, they work correctly now in ffmpeg.
Cross-reference: 
https://github.com/Dash-Industry-Forum/dash-live-source-simulator/issues/115

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