[mythtv] [mythtv-commits] Ticket #799: DTV recordings sometimes show doubled recording length

Michael T. Dean mtdean at thirdcontact.com
Tue Oct 2 15:52:09 UTC 2007

On 10/02/2007 10:28 AM, Tom Dexter wrote:
> The situation where stations use different frame rates certainly
> sounds like an ugly one.  I've been noticing the incorrect total
> lengths on NBC broadcasts (53 minutes rather than an hour for example)
> from that one.  Is this something these stations have just started
> doing recently?  Sounds like a pretty awful practice to me.

IMHO, it's a /much/ better idea to broadcast a movie recorded at 24fps
at 1080p24 than to telecine that video just so you can transmit at "the
usual" 1080i60.  Similarly, interlacing a 1080p30 source to transmit at
1080i60 is just a waste.  (Yes, both 1080p24 and 1080p30 are valid ATSC
formats:  http://www.hdtvprimer.com/ISSUES/what_is_ATSC.html .  When
people say there is no "1080p" in ATSC, they mean 1080p60.)

Now, switching resolutions may be a bit more evil for the playback
system (depending on the smoothness with which the display transitions),
but I don't know of any broadcasters who are doing that.


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