Ed Dooley
Forum Replies Created
-
As much as I hate to quote such a crabby guy, Bob Zelin over on the AJA IO forum has this to say about SMPTE vs Beta:
>>>>Never ever ever use SMPTE N10. I do not know why AJA included N10 as a choice, or why anyone gives a crap about what the SMPTE committee says. Sony and Panasonic make the rules. Not SMPTE. And we have seen historically that Sony does not follow SMPTE’s standards, in everything from time code, to video levels.
The only time you will EVER use SMPTE N10 is if you have a SDI waveform monitor like a Leader LV5100D or a Tektronix WFM601. These products DECODE a SDI signal into analog component, using the SMPTE N10 format. The output appears on the 3 BNC connectors on the back of these scopes, labeled PIX MON OUT. When you hook up your Sony PVM series monitors to the PIX MON OUT of the scopes, you set your Sony monitor menu’s to SMPTE N10, or the colors will not be correct. I have NEVER seen another application of SMPTE N10 in all these years.<<<< Do a search (SMPTE) and include the AJA forum, there are a ton of hits. Ed -
They don’t have FW800 *but* they have Express Card 34! Theoretically they run at 250MB/s compared to Cardbus’ 133MB/s.
There are a number of manufacturers ramping up production, so there’ll be a host of FW400/800 and SIIG announced port-
multiplying, NCQ SATAII cards. The increase in throughput speed compared to FW800 should be impressive. So, if you have
a bunch of ATA drives in FW cases you still need to use, get the XCard 34 with FW; for much better performance (we’re talking
4 drive SATAII RAIDS plugged in to your laptop here) get the card with SATA.
Ed -
This is a pretty good explaination from the CSIF (a Canadian independent film group)
Ed>>>Drop and non-drop timecodes are both methods of counting video frames. You would be correct to think of them like two languages. Just like “non” in French equals “no” in English. Each timecode counts and keeps tracks of video frames – they do not alter or drop video frames. They only count video frames and they count differently. In fact, drop frame timecode counts video frames accurately in relationship to real time. This is why all the networks and cable companies require that the final tape masters to be delivered are on drop-frame timecode.
Everyone refers to NTSC video as 30 fps, but in actual, factual, gorey detail it is really 29.97 frames per second. No human has dared create a timecode that counts hundredths of frames (it would be too confusing,) – hence we have drop and non-drop. Clock time (electricity) operates at 60 Hz but the NTSC standard television operates at 59.94 Hz. If you double 29.97, you get 59.94 – hence – two fields per video frame. For now, that’s all we’ll say about “fields”. Because of this speed difference between 59.94 Hz and 60Hz, there is an expanding elapsed time difference between the clock and timecode readings.Drop-frame timecode counts each video frame but when that .03 finally adds up to a video frame – it skips ahead (or drops) a number. It does not drop a film or video frame, it merely skips a number and continues counting. This allows it to keep accurate time. So if you’re cutting a scene using drop frame time code, and the duration reads as, say, 30 minutes and 0 frames, then you can be assured the duration is really 30 minutes.
Non-drop timecode counts (labels) every single video frame and does not make any allowances for the fact that it is really 29.97 fps. Therefore, if you cut a scene using non-drop time code and the time reads as, say 30 minutes and 0 frames, this is not the actual running time of the scene. The total time must be converted in order to know the true running time. This is why non-drop lengths are always shorter than the real time. For example – it’s counting 3000 frames for 100 seconds when it’s really 2997 frames that equals 100 seconds. In other words, non-drop time code will count/label 3000 frames as 100 seconds, when it is actually 100 seconds and 3 frames. This is why the networks and cable companies require that their masters be delivered on drop frame time code.
The actual difference amounts to 108 frames per hour, or 86 seconds for each 24 hour period. This equals 54 video frames per 30 minutes. So if you are cutting a show using non-drop timecode, at the end of a 30 minute program, you would need to add 1 second, 24 video frames to get the accurate time. It can be roughly calculated that a program using non-drop timecode is two seconds shorter per half hour than the non-drop timecode displayed.Remember, both timecodes are merely labeling methods and do not alter the visual picture in any way, shape or form. Therefore, choosing whether to edit in drop or non-drop normally is the editors’ choice or may be determined by the preference of your post supervisor, tape house or editing system limitations. Drop and non-drop have one thing in common – hour 1:00:00:00. (The hour actually doesn’t matter as long as it’s 00:00:00.) This is why you can take an output (tape assembly) of a non-drop timecode show and insert edit it onto a drop-frame video master at 1:00:00:00 and it will lay across perfectly. It’s the same reason you can take a non-drop show, and create a drop-frame online list using 1:00:00:00 as the record in.<<<
-
The Apple article is talking about CRTs, but barefeats has been getting reports of skipped frames with the 2405.
He referenced the Apple article to say they are talking about CRTs.
Ed -
You’re right Randy, the article is talking about CRTs. I shouldn’t have said it was *because* Apple
said that about refresh rates, but that the Apple article was referenced, but only to say that it referred to CRTs.
The barefeats report says that he has been getting readers reports of dropped frames using the 2405:>>>>>January 7th, 2006 (Updated) — FCP PLAYBACK PROBLEM REVEALED
Readers have reported to me a problem with skipped frames during playback with Final Cut Pro using the Dell LCD 2405FPW display. I’m told Apple warns about this in an article on their web site, but their article is speaking of CRTs which can be set to various scan rate. To my knowledge, neither the Dell, nor any other LCD display can be set to a scan rate — since they don’t scan like a normal CRT. We are trying to recreate the problem in our lab and research the issue further. Meanwhile, we wanted you to be aware of a potential “gotcha” if you planning to purchase a Dell LCD for your Power Mac running FCP.<<<<<<< [Randy Burleson] “An LCD Display doesnt really have a refresh rate, does it?
Isn’t the response time the comparable measurement to refresh rate in an LCD?
I think the article that you referd to is talking about CRT monitors.
“ -
It’s on the home page at barefeats.com. Barefeats is referring to the 2405, Apple just refers
to “monitors” at 60hz.
Ed -
Yeah I know,
It was my feeble attempt at a joke.
Ed -
And according to their own specs, the operating temperature range is 0 degrees C to 40 degrees C.
Hmmm, let’s see, that means that here in Vermont, the whole northern half of the US, Europe,
the Snowy Mountains of Aussieland, and Mt Cook in New Zealand, the thing won’t work for half the year.
There goes my spring shoot in Mongolia documenting the mating habits of yaks. 🙂
Ed[harold ferguson] “https://www.spec-comm.com/cineporterdata.php
https://www.spec-comm.com/CinePorter%20Press%20Release.pdfMore information to ponder.
according to this info
plugs direct to p2 card slot. records to shock mount hard drive.
mounts to bottom of camera.
“ -
Glad to help! 🙂
Ed[gary adcock] “Ed] “Are you channeling Bob Zelin now? ”
ROTFL …
thanks I need a good laugh.Ed
actually I was posting at about the same time I did not see Jan’s post until after I have replied-
I do not disagree with what she said, just had a different POV
“ -
Gary,
Are you channeling Bob Zelin now? “Back in the old days before electricity, when our TVs ran on kerosene” 🙂
I think Jan explained what she meant pretty clearly.
Ed>>>>Jan said:
…..Didn’t mean to sound like I was dissing the product and saying that it was or was not less than. What I meant was, to be careful about the fact that they say that it is going to be finished by the end of January but that just might not be true. From what I saw, they had a long way to go……..<<<< [gary adcock] …….”So I tend to think when a MFG Rep says watch out, that to me means “buyer beware”.I am constantly frustrated by people that want in video everything for nothing. R+D for products like this are time consuming and expensive. I have worked in video since it was VERY VERY expensive. MY first HD suite cost over $170K for a mac, monitor, a kona card and 1T storage. Not even a deck in sight. The same basic setup with 2X the storage is now just under $20K in just under 5 years. ……..
“