Understanding DAQmxTaskControl()

Hi all ,
I have a few question about the DAQmxTaskControl() function:
1. What's the difference between DAQmxStartTask(gAItaskHandle); to DAQmxTaskControl (gAItaskHandle, DAQmx_Val_Task_Start); is there any difference in the time it takes ?
2. What's the use for DAQmxTaskControl (gAItaskHandle, DAQmx_Val_Task_Commit); I see it makes my function run faster about 40ms faster but does anybody knows how it's done and what's is purpose ?
Kobi Kalif
Software Engineer
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Hi Kobi,
If we look at the function help for DAQmxStartTask and DAQmxTaskControl, we find the following descriptions. To better understand the below descriptions, see the state machine diagram in the Performance section of the NI-DAQmx FAQ.
DAQmxStartTask
"Transitions the task from the committed state to the running state, which begins measurement or generation. Using this function is required for some applications and optional for others."
DAQmxTaskControl
"Alters the state of a task according to the action you specify. To minimize the time required to start a task, for example, DAQmxTaskControl can commit the task prior to starting."
Basically when you use DAQmxTaskControl you are explicitly telling the DAQmx driver what state to be in. In this case you are telling it to transition to the commit state instead of waiting for the DAQmxStartTask to make that transition for you. The task control gives you more advanced control on the state of your acquisition so it makes sense that it would improve your performance.
If you need more information on the different states, I would recommend the NI-DAQmx help file on your computer. Start Menu » All Programs » National Instruments » NI-DAQ » NI-DAQmx Help - search for "task state model".
Jake H | Applications Engineer | National Instruments

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DAQmxTaskControl

Hi I have a question regarding this function. If I just use the DAQmxStartTask and DAQmxStopTask when does the task go through the unverified-verified-commited phase. I know I can set each phase myself with DAQmxTaskControl but am wondering if DAQmxStartTask does all of this on a DAQmxStartTask call if DAQmxTaskControl was not used.
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The task will be implicitly transitioned through all intermediate states when it is explicitly transitioned to a state. More concretely, if a task has only been created, it is in the unverified state. If the DAQmxStartTask function is invoked, the task will be implicitly transitioned to the verified state, then the reserved state, and then the committed state. Finally, the task will be transitioned to the running state.
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The NI-DAQmx Help (Key NI-DAQmx Concepts -> Tasks -> Task State Model) has a lot of information concerning the task state model.
So, to answer your question succinctly, yes
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Fermi National Accelerator Laborary

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Solved!
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Message Edited by krispiekream on 03-12-2009 04:36 PM
Message Edited by krispiekream on 03-12-2009 04:38 PM
Message Edited by krispiekream on 03-12-2009 04:39 PM
Best regards,
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Attachments:
untitled.PNG ‏36 KB
WebcamGrab.zip ‏15 KB

thank you
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Message Edited by krispiekream on 03-13-2009 12:27 PM
Best regards,
Krispiekream
Attachments:
dll.c ‏6 KB
dll.h ‏1 KB
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21 - access("CP"."PROVIDER_ID"="P"."PROVIDER_ID"(+))
22 - filter("CWH"."PRIMARY_PRACTICE_FLAG"(+)='Y')
23 - access("CP"."CRED_PROCESS_ID"="CWH"."CRED_PROCESS_ID"(+))
25 - access("CATEGORY_CD"='APPSTAT' AND ("TYPE_CD"='APPROVAL' OR "TYPE_CD"='DENIED' OR
              "TYPE_CD"='INACTIVE' OR "TYPE_CD"='TERMED') AND "CODE"="BRDG_CODE_UTIL"."ID_CODE"("BRDG_CREDENTIAL
              ING"."GET_APPL_STATUS_CD_CTC_ID"(:B1)))
26 - filter("EVENT_CD_CTC_ID"="BRDG_CODE_UTIL"."GET_ID"('CRED','SEVENT','MSODC'))
27 - access("CRED_PROCESS_ID"=:B1)

Welcome to the forums!
user11987210 wrote:
In the explain plan I don't understand what's happining at line ID 10 and 11. Specifically, is the result at line 11 rowids from lines 12 & 14? and then what? Are those rowids somehow used in line ID 10?
9:    6     1       311        2   ....+. TABLE ACCESS BY INDEX ROWID CRED_PROCESSES   [+]
10:    9   183     61927        1   ....+.. INDEX RANGE SCAN CDPR_CTCD_FK1 1/1 [+]   [+]
11:   10     1         3        2   ....+... NESTED LOOPS
12:   11     1        16        1   ....+.... TABLE ACCESS BY INDEX ROWID CAT_TYPE_CODES
13:   12     1        16        1   ....+....+ INDEX UNIQUE SCAN CTCD_PK 1/1 [+]   [+]
14:   11     1         3        1   ....+.... INDEX UNIQUE SCAN CAT_TYPE_CODE_UK 3/3 [+]   [+]   The NESTED LOOPS operation (ID #11) has two children, ID #12 sometimes called the driving source, and ID #14 the inner loop. ID #14 is executed once for each row returned by ID #12. The results of ID #11 are then fed to ID #10 which performs an INDEX RANGE SCAN.
Hope this helps!

What codecs does Elements 7 understand?

Does anyone know what codecs Elements 7 understands?
I have both .avi and .mp4 files that I'd like to edit.
I believe the avi files have been encoded via Xvid.
Can I make Elements 7 work with these types of files?
Thanks
-Mike

Michael,
As Steve says, it is "best" to feed PE the files that it likes the best, DV-AVI.
Now, PE *will* work with many files in other formats, provided that you have the proper CODEC's installed on your system. It's less about PE's working with CODEC's, and more about it working with file types. For instance, PE can Export to most CODEC's, that you have properly installed.
Now, let's go back to "feed[ing] PE the files that it likes the best... " Since every AV file that you Import will be converted into DV-AVI for editing by PE, I find that it is better to do this conversion outside of PE. NLE's, like PE, really do not need to do extra work, and the conversion of AV files IS extra work. NLE's are designed to edit AV files, not convert them.
I use a shareware converter, DigitalMedia Converter (Deskshare), and it works almost perfectly for me. It WILL use every properly installed CODEC on any of my systems. At last count, my workstation had about 450 and the laptop 340 installed (Audio & Video). It allows batch conversion, is quick and quite good. There are freeware, and other shareware converters available. I do not use any others for 99% of my work, as DigitalMedia Converter just handles it - including DivX and Xvid, with hardly a hiccup. For me, it's about the best US$40 that I've spent, right next to the "Pro" version of QT.
In my workflow, I always start a Project by organizing and converting all of my Assets, so they work best with my NLE. If I had a bunch of non-DV-AVI files, I'd gather them into a folder, "Video," and make a folder, "Converted Video." While I was getting any stills ready in PS, I'd turn DigitalMedia Converter loose with the conversion of all Video Assets to DV-AVI with PCM/WAV 48KHz 16-bit stereo Audio. By the time my stills are re-sized and corrected for TV (assuming I'm in a DVD Project, like I normally am), my Video files are all converted and ready for Import. I do the same thing for all MP3 Audio Assets, as PCM/WAV (to spec above) is what works best.
Now, I'm ready to Import and get to editing, which is what PE (or any NLE really) is all about. They use a good amount of a system's resources already, so I do not want them bogged down having to convert file types also. Besides, 3rd party converters usually do a much, much better job with the conversion - that is what THEY do best.
It will save you a lot of grief if you incorporate ideas, like these, into your workflow, and do them outside of your NLE. Also, I find that it's also better to organize one's Assets into the Project's folder hierarchy, than to grab Assets from all over the system. It pays off, when you wish to "archive" the Project. It also means that I am not working with my original Assets, but copies that I have placed in the proper folders, within my Project's structure.
Now, you do not have to do this. You can try and force your NLE to work with whatever you try to feed it. Your results *migh* be OK, but I'll bet that you encounter problems someplace, even if it's just sluggish performance.
There are several recommendations for freeware and inexpensive shareware converters in the FAQ's section. Be sure to read all of those, not just the ones for your version of PE. If a program is recommended in the FAQ, it's because they work. I just happen to have some others, that I own, know and that work for me.
Good luck,
Hunt

OCR'ing Oversized Documents

Hello!
I have been given a set of scanned documents that are very VERY large, and, as a result, I am unable to OCR and index them. These documents do not appear to have been necessary to be this large - they probably should have been scanned to 8.5 x 11 inch - and I have no control over the original documents in order to re-scan them. Is there a way I can reduce the actual size of the documents so that:
a. I can OCR and index them; and
b. They can easily be printed on letter-sized paper when the time comes?
Thanks for your help!

NJStateWorker,
You should view Adobe's helpful video regarding file optimization, which can be found at http://tv.adobe.com/watch/acrobat-x-tips-tricks/how-to-optimize-your-pdf-file/. If your files are so large as to resist optimization due to the lack of available memory on the computer you are using to perform the task (Acrobat Pro is a memory hog and, moreover, both its optimization and OCR-ing features appear to contain memory leaks), you can always first split your file into segments, run the optimizer and/or OCR engine on these pieces, and then marry the segments back together. My experience with Google Books data is that the OCR engine will crash after about 200 pages regardless of whether I am simultaneously downsampling or not, so I always break down my files into chunks of 150 pages before performing the OCR. If your documents contain grayscale images, I suggest selecting JPEG2000, which is a much more efficient algorithim for storing image data than may be present currently in your file. If changing the encoding algorithm alone does not provide you small enough files to use comfortably, downsample to a lower dpi. Moving from a relatively high setting such as 600 dpi to a lower resolution, say 200 or 300 dpi, will result in a remarkably smaller file, by downsampling to 400 hardly makes a dent. If your output files will need to be printed, however, viewed on high resolution monitors, or be needed for subsequent high resolution needs of any kind, downsampling might prove unaccceptable, so do some tests at various settings before deciding which numbers are the best to use and, of course, offer your client a chance to confirm your suspicion and understanding. Moving from 600 dpi, for example, to 300 dpi on scans of pages that contain primarily text characters (e.g. a typical page from a published book), results in notable "halo-like" noise that surrounds the now downsampled characters, even with anti-alias measures ("bicubic downsampling") turned on. The pages can still be read easily, but the background of the pages will appear noticably "dirtier." Finally, be aware that if your client requires your output files to be viewed on iOS (Apple) devices, JPEG2000 compression demands the use of iOS version 5.0.
Compressing your files using any choice offered in the Acrobat Pro's Optimization panel (as shown in the video that I pointed out above, and similar versions of it in Acrobat Pro vsersion 8 and 9) will NOT result in a change to the printed-out size of the image, only to the method by which the image data is stored within the file itself, meaning that your images, whether encoded as JPEG, JPEG200, CCITT (TIFF), or any other format, will still print out 8.5 x 11.
I hope this helps.

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