Talk:SMPTE timecode/Archive 1

Archive 1

Frame rates > 30?

Can anybody confirm if source material in 480p, 720p, and/or 1080p formats uses timecode with frame numbers 0..59? The article mentions only frame rates up to 30 Hz. Thanks, Andrwsc 00:13, 17 November 2006 (UTC)

-- Yes. 720/60 cameras produce timecodes up to frame 59. There are 59.94 (double 29.97) rates on most of these cameras and presumably there is some variation on drop frame to deal with this; I'm not sure exactly what it is. —Preceding unsigned comment added by 91.84.66.6 (talk) 18:31, 19 September 2008 (UTC)

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I can confirm this; the drop-frame scheme that seems to be used (at least on the JVC GY-HD series cameras) drops four frame numbers from the start of eligible minutes. This makes perfect sense; double the frame rate and double the dropped frame counts, but I'm not sure if this is in the SMPTE or EBU specs. I presume it is.

"Studio"

The meaning of "studio" isn't clear to the general public. What is done in a studio, besides studying? Unfree (talk) 07:51, 31 August 2009 (UTC)

Cooperating standards

What distinguishes cooperating standards from other ones, and with what do they cooperate? Unfree (talk) 07:56, 31 August 2009 (UTC)

Leap Seconds?

I'm unclear on whether SMPTE ever records actual UTC timestamps in media. If so, what happens during leap seconds? Is a timestamp of 23:59:60 ever recorded? --NealMcB 22:39, 13 January 2006 (UTC)

My impression is that SMPTE is a purely relative time coding format, ie. doesn't record UTC time or similar. (Time zero in SMPTE will mark the beginning of either some recording session, the finished film reel or similar.) Jiifurusu 22:57, 22 January 2006 (UTC)

SMPTE may be indeed syncronized to real time (UTC, "wall clock time"). However, the time code gets resynced at regular intervals (typically daily at midnight). Clock inaccuracy in video/studio is also a slight problem; after 24 hours, the equipment will also be likely to be a few frames off the theoretical correct frame number. --Klaws 16:55, 10 May 2006 (UTC)

Actually, the time code is typically resynced at 0215. Most broadcasts run through midnight and top of the clock is a busy time. Adamelk (talk) 05:13, 17 July 2010 (UTC)

Question

Quotation: "That is, drop frame TC drops 2 frames every minute, except every tenth minute." In the very first minute (starting at 00:00:00:00) no frames are dropped. Should this be mentioned for clarification? Perhaps one could simply write "except minutes 1, 11, 21, 31, 41 and 51 of every hour" or something like this to avoid any misunderstanding.31.18.163.224 (talk) 20:27, 14 February 2013 (UTC)