user18532: According to this video, we use 29.97fps under NTSC standard.
But now we have ATSC standard, do we still need 29.97fps in order to broadcast under ATSC?
Is it still meaningful to have a newly created video with 29.97fps?

user14523: The non-integer HD frame rates (interlaced 59.94 and progressive 29.97) exist to facilitate easy downconversion to Standard Definition (SD) that must operate at 29.97. There is no technical reason that the non-integer frame rates must be used in ATSC or other SMPTE 292 systems, just the compatibility reason.

18532: <p>According to this <a href="https://www.youtube.com/watch?v=3GJUM6pCpew" rel="nofollow noreferrer">video</a>, we use 29.97fps under NTSC standard.</p>

<p>But now we have ATSC standard, do we still need 29.97fps in order to broadcast under ATSC?</p>

<p>Is it still meaningful to have a newly created video with 29.97fps?</p>
 14523: <p>The non-integer HD frame rates (interlaced 59.94 and progressive 29.97) exist <a href="http://www.hdhead.com/?p=108" rel="nofollow noreferrer">to facilitate easy downconversion to Standard Definition (SD)</a> that must operate at 29.97. There is no technical reason that the non-integer frame rates must be used in ATSC or other SMPTE 292 systems, just the compatibility reason.</p>
