It's an Omneon video server which is the only HD recording device our station currently has.I didn't know that about SMPTE time code at the timecode level. Omenon must be either recording non-standard timecode within their files, or they are doing the conversion back to 60 frame counts for GUI display.
Curious, though, because the user bits are four groups of 8 bits each, for a max display of FF:FF:FF:FF. I would have thought that the timecode side used the same bit allocation, simply wasting the extra bits (at least until 60fps came along.)
John----- Original Message ----- From: "Russ Wood" <russ.wood@xxxxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx> Sent: Friday, July 18, 2008 11:23 AM Subject: [opendtv] Re: Frames Per Second of 720P
John, SMPTE 12M only has two bits to define the tens of frames in the timecode. SMPTE 12M-1 section 12 says that the time address should increment only every other frame, the field mark should be used to differentiate between the two frames labeled thus. SMPTE 12M-2 section 9.2 says that Progressive TV systems with frame rates greater than 30 frames per sec a single time address should identify a pair of frames. Is the kit you are using double counting the frame addresses and adding one for the second. Russ Wood -----Original Message----- From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On Behalf Of John Shutt Sent: 18 July 2008 13:37 To: opendtv@xxxxxxxxxxxxx Subject: [opendtv] Re: Frames Per Second of 720P The Sony brochure http://bssc.sel.sony.com/Professional/docs/brochures/mvs8000.pdf states that the switcher operates at 1080i60, 1080i59.94, and 1080i50. This is probably where the Sony rep got confused, because 1080i60 is indeed 30 unique frames per second, and 1080i59.94 averages out to 29.97 unique frames per second. This is exactly why I don't understand the nomenclature that seemed to only come into fashion with the advent of HD, of calling 1920x1080 thirty frames per second interlaced as "i60" Read the timecode, there are 30 frames per second in the timecode, therefore it is a thirty frames per second (ignoring the 1.001 for the moment) format, and should be called "i30" which clearly states 30 fps, presented interlaced. When recording "1080i59.94", you can frame advance through the timecode and watch the time change from 00:00:03:29 to 00:00:04:00. In contrast, with 720p59.94, you can watch the timecode change from 00:00:03:59 to 00:00:04:00. "1080i60" looks better on paper next to "720p60" I suppose. John----- Original Message ----- From: <dan.grimes@xxxxxxxx>I just attended a demonstration of a Sony MVS8000 production switcher.Theswitcher can output 720 at 59.94 P and 1080 at 29.97 I. As I we discussed frame stores, I asked if it took 60 frames to storeaone second motion clip (120 with a key) and they said no, only 30.They(multiple Sony reps) were telling me all video is 30 frames persecond, nomatter what the format.---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line. _______________________________________________ This email has been scanned for Softel by Star. _______________________________________________ This email has been scanned for Softel by Star. ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.
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