IMAQ AVI Read Frame vs. IMAQ AVI2 Read Frame, no data terminal

Hi,
I just noticed when dropping a IMAQ AVI2 Read Frame vi in place of an older IMAQ AVI Read Frame vi, there is no "data out" terminal. I do make use of this feature to add data to the frames of the AVI. Is there supposed to be an alternative way to store this frame data, using the imaq image custom info perhaps?

Hello David,
You are correct in that the data out terminal is no longer available in the AVI2 functions. However you can use the IMAQ Read Custom Data and IMAQ Write Custom Data functions. These allow you to write and read custom data to the IMAQ images using specified keys. In this way you can add miscellaneous data to your images for later use.
Earl C
Applications Engineer
National Instruments

Similar Messages

IMAQ AVI read frame performance

I've been playing around with the read AVI with buffer example in the Developer Community. It reads all the frames of an AVI into memory and then plays them back at the appropriate frame rate. This works ok with very small AVI files but with anything larger it gets slower and slower until it almost stops loading the AVI. At that point it seems to be loading less than 5 frames per second and is killing my cpu. I have plenty of free RAM during this.
https://decibel.ni.com/content/docs/DOC-8479
This is the case with the play AVI example that comes with Labview too (without a buffer) which just loads and plays one frame at a time. Can someone suggest a way to improve the performance of an AVI player in Labview? My ultimate goal is to read an AVI and detect changes in motion of objects by comparing two frames at a time. These AVIs are going to be at least 5 minutes in duration at a frame rate of 30 fps.
I'm using Labview 2009 with the Vision Developer installed.
Attachments:
image_png.png ‏77 KB

VTKim wrote:
Hi,
One thing we could implement is a compression filter that is on the IMAQ AVI Create VI used in conjunction with the IMAQ AVI Get Filter Names VI. Also, what is the RAM available on your computer and what size images are you acquiring and saving to AVI? Thanks!
Kim
Thanks for replying. I'm running labview 2009 on a dual core pentium 2.3 GHz with 4 Gigs of ram. It typically has 2 Gigs free while running the program.
I'm not tryingt write an AVI, I'm trying to read an AVI. The frames are 352 x 240 in size. I've tried several read AVI examples and they all act the same way. They slow down quickly and the hard drive and CPU are really cranking away.

IMAQ AVI - What is "frame read lookahead"?

Hi,
I'm using The IMAQ AVI Read Frame function, and just wondering what the "frame read lookahead" input actually does. The documentation is very vague.
Thanks

What is vague about it? What additional information do you need?
Mike...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
Be thinking ahead and mark your dance card for NI Week 2015 now: TS 6139 - Object Oriented First Steps

Error -1074395975 occurred at IMAQ AVI Read Frame DirectX has timed out readin

When i run the "Read AVI Example" on every kind of AVI file, I get the error:
Error -1074395975 occurred at IMAQ AVI Read Frame DirectX has timed out reading or writing the AVI file. When closing an AVI file, try adding an additional delay. When reading an AVI file, try reducing CPU and disk load.

The forums search gives two threads talking about this error:
http://forums.ni.com/ni/board/message?board.id=170&message.id=392042&requireLogin=False
http://forums.ni.com/ni/board/message?board.id=170&requireLogin=False&thread.id=195832
Did you allready had a look at them?

Error en IMAQ AVI Read Frame

saludos al foro...
alguien me puede ayudar con el error-1074395975 ocurred at imaq avi read frame.
tengo labview 2011
ni vision 2011
ni vision assistant 2011
directx11
adjunto una imagen del diagrama a bloques y el mensaje de error
gracias
¡Resuelto!
Ir a solución.
Adjuntos:
imagen.png ‏39 KB

vicbit ....tal vez se podría revisar un ejemplo para la versión 2013 que podría servir ...... llamado "Read AVI File.VI" que se encuentra en la ayuda..... como menciona Omar las funciones relacionadas con el manejos de archivos AVI, fueron cambiados en la ultimas versiones asi que saldrá un poco diferente o tal vez el ejemplo no se encuentre . Yo pienso que el truco radica en el uso adecuado de los " Frames per Second" ,"Number de frames" y el "time Delay".
Algo que observe en los códigos que han subido anteriormente es que no es necesario usar dentro del ciclo la funcion "Imaq Create" ya que va a crear un espacio en memoria cada vez que se ejecuta un ciclo (Cada frame) esto no es necesario y podria afectar , además no se estan liberando estos espacios con "Imaq Dispose VI".
A continuacion la imagen del ejemplo que se encuentra en la versión 2013
en la versión 2010 se puede encontrar ejemplos también-->https://decibel.ni.com/content/docs/DOC-14904
Jonathan Cruz
CHALLENGER
K U D O S __ B I E N V E N I D O S

IMAQ AVI read frame error

Hello,
What does the IMAQ AVI read frame error "Trigger Time out" mean ?
Thank you.

Hello Vanessa,
In some applications, when a trigger occurs after several minutes or when integration takes several seconds, the timeout parameter may be too small to wait the amount of time it takes to acquire an image. If the image you request is not ready by the timeout parameter, the acquisition code generates a timeout error.
To prevent this problem, check the acquisition status and request an image only when you know one is ready. By just checking the acquisition status and not requesting an image, you could wait indefinitely for an image without receiving an error.
Sanaa TAZI
Application Engineer
National Instruments

"IMAQ AVI Create" not found under menuitem "AVI" (IMAQ 2.6)

Does anyone know why the Libs. "IMAQ AVI Create ,IMAQ AVI Open ,IMAQ AVI Read Frame ,IMAQ AVI Get Filter Names" are not located in the "AVI" menu ? (IMAQ 2.6)
Thanks Mario

The AVI VIs should be located there, if they are not there was probably a problem with your installation. Launch the installer again by going to Add/Remove Programs and selecting National Instruments Software. From there another menu will open showing most of your NI software. Select on NI-IMAQ 2.6 and select modify. Double check that support for your version of LabVIEW is selected, and proceed with the rest of the install. If you are still having problems, I suggest calling going to www.ni.com/support and getting a hold of NI Tech support.

Where is IMAQ AVI Get Filter Names VI?

I have LabVIEW 6.1 with NI IMAQ 2.6 and NI Vision 6.0.5. I'm trying to create a compressed AVI file from a camera source, and the help file states that there's something called the IMAQ AVI Get Filter Names VI that will return the filters I can use for AVI compression. This VI isn't there in my installation, though.
Am I doing something wrong, or do I need to download something else?

Try looking in the folder C:\Program Files\National Instruments\LabVIEW 6.1\examples\Vision\2. Functions\AVI for the AVI Compressor Comparison.llb example program. This uses the AVI Get Filter Names VI. If this is not available, then you need to upgrade to Vision 7.0 in order to get the functionality to read AVIs into LabVIEW.
Hope this helps-
Julie

Can you write an avi file without using imaq

Just curious if anybody has tried to write an avi file without using imaq vi's? So far I have only found sketchy info on the file format and am looking for some help on the file structure etc. Any references or example avi files with explanations of format would be most helpfull. Thanks in advance -

Absolutely.......
An AVI video file is actually structured in the same way as most Windows media files or RIFF files as they are generically known, thus the description below is applicable to for example WAV files etc.
Thus the file always begins with the four byte code RIFF and continues to use this generic four byte coding known as FOURCC, four-character code or FCC throughout.
There are then specific requirements for each different media content and the sections that must be included to define a valid file structure of the desired meadia type.
Each section or 'CHUNK' is defined by an FCC (RIFF being the first) with facility to include additional FCC's as required. The FCC is followed by a length descriptor and then the data (just for fun the odd CHUNK does not quite fit this very general overview). These chunks then align to even word boundries so padding zeros are often inserted at the end of a CHUNK to make it all nice and neat.
It is a requirement that software that does not recognise an additional custom CHUNK should ignore it, this is very easy as all you have to do is use the length descriptor to 'jump' over the CHUNK concerned.
The following is an example from the 'CLOCK.AVI' found on windows computers for a number of years...
RIFFjB AVI LISTŒ hdrlavih8
Here you can see the RIFF followed by a four byte length descriptor (4 Gigabytes), followed by various sub CHUNKS in this example the sub CHUNK is an AVI (note that it is actually 'AVI ' to conform to the FCC).
So the CHUNK structure looks a bit like this:-
RIFF ('AVI '
LIST ('hdrl'
'avih'()
LIST ('strl'
'strh'()
'strf'()
'strd'()
'strn'()
LIST ('movi'
{SubChunk | LIST ('rec '
SubChunk1
SubChunk2
['idx1']
For more information on all this you need to read the RIFF specification documentation on the MSDN website or on the MSDN Technet materials. Most of the stuff you will immediately locate will refer to the AVI file format as that is where most of the recent effort has been focused.

Imaq avi get info do not retrieve any info

Hi everyone,
I have some trouble with the vision VI IMAQ AVI get info,
everything was working well then I don't know what happened but the VI does not retrieve any information on any files, and I get the following error:
Error -1074395993 occurred at IMAQ AVI Open
Possible reason(s):
IMAQ Vision: File I/O error.
I need the framerate, Width, height and number of frame from this VI or else I cannot develop my application.
it only returns 0 on all values but the number of frames which is not correct 4294967295
I am thinking I might have broken the vision library.
Thanks for your help.

Sorry for the multiple message,
I have found why it did not work it was not the imaq get file info but the IMAQ AVI Open VI that does not like the path string given by the open/Create/Replace File VI.
If you have any idea why it would be appreciated.
Thanks.
Attachments:
Open Avi.vi ‏22 KB

Accessibility: Reading order of tables and anchored frames

I am creating accessible, tagged (section 508 compliant) PDFs in FrameMaker 9. The reading order for tables and frames is not correct.
When I view the PDF reading order using Adobe Acrobat Professional or another screen reader, anchored items such as tables and anchored frames are placed last in the reading order, regardless of where they appear in the document flow or page layout. The reading order skips over all tables and frames, reading all paragraphs on a page first, then reading the tables and frames as the last objects on the page. This logically doesn't make sense to skip over tables/frames as they generally apply to the content that preceeds it.
For example, the following document structure:
<Paragraph 1>
<Table 1>
<Paragraph 2>
<Anchored Frame 1>
<Paragraph 3>
<Anchor Frame 2>
<Paragraph 4>
is being read by assistive technology as:
<Paragraph 1>
<Paragraph 2>
<Paragraph 3>
<Paragraph 4>
<Table 1>
<Anchored Frame 1>
<Anchor Frame 2>
I want the document structure to be read correctly as intended.
In otherwords, the PDFs generated by FrameMaker 9 are not completely accessible because of incorrect reading order output by default. This information is not listed in the VPAT for FrameMaker 9.
I want to avoid any post processing using Acrobat's Touch Up Reading Order tool. Is there a way to automate updates to reading order?
Can FrameMaker 9 logically place tables and anchored frames into the correct reading order? How do I adjust these settings?
Thanks in advance!

As mentioned above, tables and anchored frames are inserted into thier own paragraph style "Frame". The paragraph style "Frame" is tagged. To my knowledge, there are no options for tagging or not tagging tables or anchored frames.
Regardless of which paragraph type the table or anchor frame is inserted into, and what that paragraphs tagging settings are, it is still last in the reading order.
I've tried a variety of options: tagging the "Frame" paragraph style as a sibling, child, and parent of my other paragraphs; I've even tried omitting it from the reading order. None of these options present anchored frames (and tables) in the logical reading order.
Even images that are inline (within a paragraph; not in thier own paragraph) are not being read as part of the paragraph. Inline images get skipped over by screen readers and get read at the end of the page, which makes no sense whatsoever.
All tables and images end up at the end of the reading order (after ALL paragraphs) regardless of the tagging settings.
Refer to my previous screenshot for a clear diagram of what is happening to the reading order. Each of those anchors is in it's own paragraph style. I want tables and anchored frames to be sequential in the reading order along with paragraphs. (1,2,3,4,5,6 not 1,4,2,5,3,6.)
I'm using the Tags tab of the "PDF Setup" dialog to adjust these settings. Is there somewhere else I should be making changes to the reading order?
This is a bit disturbing because FrameMaker touts creating accessible documents and this severe reading order issue impares my ability to do so. I would not consider documents that jump around the page in an illlogical, fixed order, to be accessible. I'm very suprised that no one else has encountered this issue (at least that I can find...)

HT3775 I am using OS X Mountain Lion and I have this .avi file but not able to read. What is missing in my setup and what other file do I need to download to enable me to read? I can read mp4 files though.

I am using OS X Mountain Lion and I have this .avi file but not able to read. What is missing in my setup and what other file do I need to download to enable me to read? I can read mp4 files though.

Here is a link: https://itunes.apple.com/en/app/mplayerx/id421131143?mt=12
I agree that VLC is also a good choice but MPlayerX is more user friendly.

XNET CAN frame queue overrun kills Read VI

Hello, I am trying to read CAN frames via XNET. My problem seems to be connected to the queue of my Input session: If the queue gets bombed with random CAN messages from somewhere, the session property "Number of Values Pending" increases rapidly. That's ok, because my program calls XNET Flush before it starts using the bus itself. Otherwise my program would read the old queue content first and the expected reply frames later. This behaviour is ok and expected.
But after I bombed the bus a little bit more so that the queue gets filled to maximal queue size (seems to be predefined as 1000), the Input session read operation will always timeout (tested with 1 second and more) and return an empty frame array. In this case the error wire is s to -1074384886 (timeout). The session always reports tranceiver state "Normal". Even the XNET Flush operation does not help, although it seems to empty the queue properly.
summary: hitting the queue size limit with incoming CAN frames results in dead read operations.

Hello pgraebel,
In the screenshot you posted, NI-XNET will wait 0.1seconds for 1 frame to be present in the queue. If there is less than 1 fram available, the VI will timeout. That being said, I would guess that the timeout happens if you ask for many frames (close to the buffer limit), but the timeout is too small. If you are trying to read 1000 frames, you may need to wait longer than 1 second for the frames to go on the bus. That really depends on your bus timing/frame timing/etc.
I made a small example to show you a little more how the buffers can be used in XNET. You can set the buffer size and look at the unused spaces in both the read and write queue. Let me know if it helps.
O. Proulx
National Instruments
www.ni.com/support
Attachments:
CAN Frame Input Queued.vi ‏37 KB

Incompatible image size avi2 write frame

Hello,
I am a beginner in LabView, and I am currently trying to use the Ximea CCD and reading the image and writing it into an AVI file. I make sure that the image is RGB U32 before it goes into AVI2 Write Frame, but it still gives me the error "incompatible image size." Everything up to the AVI2 Write Frame block seems to work fine. Any advice would be appreciated. Thank you in advance.

Without seeing the code, it is difficult to begin to suggest wher the trouble arises (personally, I think it is the fourth function from the left ...).
Before trying to save images, are you able to acquire them in MAX? If so, then MAX should be able to provide you with parameters that you might need for the various Image Processing VIs (such as the size/type of the Image buffer).
Bob Schor

How do I convert an IMAQ image buffer into an IMAQ Vision 'Image'?

Using NI IMAQ and IMAQ Vision with LabWindows/CVI 6.0...
I have some acquisition code that uses IMAQ img functions to set up a
triggered image acquisition and stores the image into an 1D unsigned char
array buffer.
I would now like to add code that uses the IMAQ Vision functions. The IMAQ
Vision function use an Image data type, which from what I can glean from the
..h files, is a structure.
Is it possible to convert the 1D unsigned char array image buffer to an
Image? How would I do this?
An inefficiant brute-force way would be to write the image to a BMP file
from IMAQ using imgSessionSaveBufferEx, then read the same file back in
using IMAQ Vision imaqReadVisionFile. I am hoping there is a more elegant
way to perform the conversion in memory without needing to write disk files.
Thank you,
Robert Rafuse
Etec, Inc.
tel: (978)531-5025
e-mail: [email protected]
web: http://www.etec-inc.com

Bob Rafuse wrote:
> Is it possible to convert the 1D unsigned char array image buffer to
> an Image? How would I do this?
Never mind. I found:
http://sine.ni.com/apps/we/niepd_web_display.DISPLAY_EPD4?p_guid=B45EACE3F11556A4E034080020E74861&p_node=DZ52490&p_submitted=N&p_rank=&p_answer=&p_source=External
which indicates that the img functions actually return a 2D array, so I can
use imaqArraytoImage after all.
My bad.
Bob

IMAQ AVI Read Frame vs. IMAQ AVI2 Read Frame, no data terminal

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