I wouldn't be surprised if they're using old tried and true transport stream to reduce risk. At Astra #1-#3 we were instructed to use IRIG 106, because it's been validated for 50 years and the spec really showed it's age.
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Change comes slow at NASA thats for sure, radio protocols included. I can easily see a video encoder with a not so great CBR rate control trying and failing to fit inside an inelastic and inadequate bitrate allocation in a very visible way
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