DirecTV transcodes HD OTA to MPEG-4. It is MPEG-4 that is broadcast by the satellites. I don’t believe there are any HD broadcasts on DirecTV in MPEG-2.
Dish is doing this too, but I don’t know how far along they are.
Comcast is starting to switch. See:
@Jestep @jkline
But actual OTA broadcasts are still MPEG-2 in the USA as far as I know. Can you name any network broadcasting OTA in MPEG-4?
Maybe I should have said, in the world 
Why would you ask me this question?
My reply was to the statement that “all those devices record the native MPEG2 video”. That quote was In regard to a list of devices that included DirecTV. I made the statement that DirecTV HD channels are broadcast in MPEG-4. This includes OTA local channels that DirecTV transcodes before broadcasting.
If you are disputing this assertion, let’s talk. If you want to change the subject, I’ll pass.
The point is all of those devices record in the native format of what is broadcasted thus:
Tablo does and must transcode so there is an inherent delay in this process and minimal quality loss - if it’s too long of a delay for you or too much of a quality loss for you, the Tablo is not for you. It is not a design flaw, it is the intended design.
@MotobikeMan asked “Aren’t ALL the OTA channels broadcasting MPEG2?” to which I responded “Yes”…and you replied to @MotobikeMan with your statement above…so it didn’t seem to be a response to “all those devices record the native MPEG2 video”, since that post was made by @theuser86.
See the confusion? I have no issue with you, or the fact that DirecTV and a variety of CableCo’s are currently transmitting or converting to MPEG-4. I simply wanted to make the point that today, all actual OTA (not re-transmitted) signals are MPEG-2 - witch was the original question posted by @MotobikeMan.