Avi read write example : playback missing chunk of data at regular intervals

Hi,
I am writing a waveform data into avi write in order to read back (with has data input on) as in example avi read write with data shipping example but the graph played back is missing some amount of data at regular intervals and hence the waveform read back is choppy.
I am writing the same data into tdms also. when i read back it with tdms file viewer, it shows that it has entire data.
note: i am writing the waveform data and avi in two seperate loops and using the porperty node value of the waveform data in the video loop in order to insert data into avi write (has data input on) and have the (wait ms multiple) input =10 in both loops
i would like to post the video but it is 50 MB, is it possible to upload that much.
can any one help me how/why this is happening..
Thanks,

Can you post a VI(s) as I have trouble understanding what you are doing
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)

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Problems using AVI read/write example

I would like to test some vision processing software I wrote by reading an AVI file rather than a live stream. I found the "AVI read/write example" mentioned on this forum and it sounds like exactly what i need, but I cannot get it to read my avi files. When I run the example read VI, it says "An exception occured with the external code called by a call library node". Doing further testing, I found one AVI on my computer that would work, all others crash the VI. Another odd behavior is that the "avi init read" subvi will return the wrong frame rate for some AVIs. I have tried both compressed and uncompressed AVIs all in RGB format. I have also tried different frame rates and encoding options for my AVI file with no luck. I am just a stud
ent, so buying software is not an option for me.
Has anyone had problems reading AVIs with this? Are there AVI encoding options that will make this VI work?

Hello,
I think the avi functions that you get are VFW based, it can not read
any format of compression codec. But it should be able to read
uncompressed AVI files. But anyway, if you can't get IMAQ-vision 7.0
avi functions to try (I don't have, I don't know how it works), you
can always get my IVision to try out. In IVision, there are two groups
of avi functions. One is called "AVI functions", they are VFW based,
so not always work for all kind compressed avi files, but I have
another group called "Media files", the functions there work for all
format compressed AVI files, including mpeg, asf, avi... you can
access the frame image by using a callback vi (example included), seek
the media position, change play rate, etc.
Go to get a download at:
http://www.hytekautomatio
n.com/Products/IVision.html
Irene
excube wrote in message news:<50650000000800000028B00000-1068850981000@exchange.ni.com>...
> I would like to test some vision processing software I wrote by
> reading an AVI file rather than a live stream. I found the "AVI
> read/write example" mentioned on this forum and it sounds like exactly
> what i need, but I cannot get it to read my avi files. When I run the
> example read VI, it says "An exception occured with the external code
> called by a call library node". Doing further testing, I found one AVI
> on my computer that would work, all others crash the VI. Another odd
> behavior is that the "avi init read" subvi will return the wrong frame
> rate for some AVIs. I have tried both compressed and uncompressed AVIs
> all in RGB format. I have also tried different frame rates and
> encoding options for my AVI file with no luck. I am just a student, so
> buying software is not an option for me.
>
> Has anyone had problems reading AVIs
with this? Are there AVI encoding
> options that will make this VI work?

Access 2013 Read/Write Connection on 365

Have web tables all set up on 365 account. Have set the connection management to Read/Write. But I can't figure out how to link to them from a desktop Access app.
From within the desktop app if I use the External Data tab - to link to them - attempting the Sharepoint Lists - - - the tables don't appear. Am pretty sure because the web tables on 365 are not Sharepoint Lists.
Have searched on this for awhile and am not finding instructions anywhere. ... One can get a Reporting desktop app set up with a single button but it is read only......sure wish it was this easy for read/write.....
Appreciate any help......

It still possible to use a 2010 web application in 2013 that is using SharePoint tables, so some confusing here is legitimate.
In your case as you WELL note you using 2013, and thus as you WELL note it makes no sense to look for tables in SharePoint when clearly that is not where they reside.
To find the connection string in the web application just go file.
You see your application name, and below that
Data Connectivity
In that you see the server name, and the database name. You can use your 365 Account as the logon + password.
However, for a read/write? In the above area, click on "manage" beside the connections.
In the list of options for connections such as "From any location", and the "Enable Read-write" connections, there is an option called:
View Read-Write Connection Information
Click on the above option. This will result in a dialog box that gives you database name, and the user + password required to link to that database in read/write mode.
So you simply create a regular plane Jane desktop database. You then choose external data and then choose ODBC. This will let you create a link to SQL server. How this works much the same as it always has in Access (more then 16+ years). You
then type in the correct server + user information from above web application.
I do think you need to choose the new ODBC 11 (Native sql server driver) for this to work. So, don't choose SQL from the list of drivers, but choose the new native or ODBC 11 drivers when setting up the ODBC connection from Access.
Best regards,
Albert D. Kallal (Access MVP)
Edmonton, Alberta Canada

Sharing directories READ/WRITE from Global Zone

I would appreciate some advice on the configuration of a machine in a client's environment.
I have a global zone on a v880 running Solaris 10, with 4 sub zones. The v880 has 2 A1000's connected to it.
One A1000 is mounted as /storage0, and the other as /storage1, with both having subdirectories called "zone1" "zone2" "zone3" and "zone4".
There is a requirement to have the /storage0/zoneX directories mounted READ/WRITE onto the appropriate zone as /data/rawdata, and the /storage1/zoneX directories mounted READ/WRITE onto the appropriate zone as /data/processeddata.
My client's environment where my hardware is located runs DHCP to assign IP addresses (and the DHCP server is non-Solaris).
My global zone has picked up an IP address over DHCP with no problem - I only had to modify /etc/nodename and /etc/hosts to ensure that the domain had its own name (i.e. it was not named "unknown".
In order to mount the filesystems READ/WRITE on the sub-zones, I thought there were 2 ways to proceed.
1) Give each subzone an IP address, NFS share the directories to be mounted, and mount them on each sub-zone as READ/WRITE....
HOWEVER, as stated, the client is on DHCP, and zonecfg seems to only allow us to set a static address. Is there a way to configure zones to pick up their IP addresses from a DHCP server?
ALSO - if I went down this route, would I have a massive overhead on NFS server?
2) Add the /storageX/zoneX directories to each zone as an "add-inherit-dir", and NOT configure each sub zone as a network presence.
HOWEVER, when I trialled this, the zones mount the file systems as READ ONLY. Is there a way to get the zones to mount the file systems as READ/WRITE?
ALSO - without the network presence, when I try to change user passwords on the zones, I get an error message of "passwd[5051]: passwdutil.so: can't get domain. Permission denied".
Actually, as I type this, I've thought of a third.... Is there a way to share the same IP address and network interface across mutliple zones and a global zone? If so, this may be the best method.... But how do I configure it?
Any assistance would be appreciated.

It's not "supported", but that's because RM6/RDAC doesn't work on Solaris 10.
If the array is configured, it just appears as a normal scsi device and it works fine. You just can't modify the configuration or monitor its status. Not something I'd do in production, but I might stick one on a non-production host.
Darren

Missing Codecs in AVI Compressor Comparison Example

Hi all. I am trying to write a program what will compress avi's and as a starting point i had a look at the AVI compressor Comparison Example, but when i run it it is only showing 2 codecs. I have a few installed and they all work fine with windows media player. Am i doing something wrong? Wonder why they are not showing up in the name array output from IMAQ AVI get filter names.vi ? I was hoping to use the Lagarith lossless codec, but so far no luck.
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Hi dirtyb15,
If you don't mind finding a couple more 64 bit codecs that we could test in order to verify that the issue isn't just with the Lagarith Lossless Codec that would be great. After I conduct those tests with the other codecs I can move forward with the creation of a CAR.
As far as your sound issue, the reason why you have no sound after you do the compression is because the IMAQ AVI VIs are only reading the video data in your program, not the sound data. Therefore, when it reads in the AVI, it doesn't take in the sound information. Consequently, the new compressed version of the video doesn't have the sound attached to it. If you want to have audio played you'll have to get the audio data and combine it back into the avi. I linked a different forum post that describes methods to do this. Thanks for your patience and cooperation.
Thanks,
Paul M
National Instruments | Applications Engineer | www.ni.com/support

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.

Missing file read/write feature on Mac OS X?

HI,
i am missing the file read/write statistics on Mac OS X. First i thought i just need to enable it in the template editor under "Advanced -> Java Application" but the two list items are simple not there. I ve seen a screenshot somewhere from the JMC where the two options are present but not for me. Can anyone tell me if this is a platform issue or how to enable it?
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Marc

You didn't say which version you are using, but I think what you are seeing is that the file and socket events are not available in JDK 8 only in JDK 7. This is a known regression that will be fixed in the next update to JDK 8.

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.

AVI Compressor Comparison Example not working with Flame.avi

Hello,
I downloaded the NI Vision module for a trial to see what it could do. I will be owrking with black and white files (AVI or other) so I tried the "AVI Compressor Comparison Example.vi" along with the "Flame.avi" from "C:\Program Files\National Instruments\Vision\Examples\Images\AVIs". Basically, the example decompresses "Flame.avi" and then compresses the same file using all of the installed codecs.
When I run the example and then try to play the avi files, all of them are blank (black) and reflect a much shorter playing time than the 16.6 seconds of the original (before decompression) avi which I can play on VLC and QuickTime but not Windows Media Player. When I look at the original video properties in LV, the file format is RGB even
though it is B&W. When I look at the video properties in VLC or
QuickTime, it shows it as Motion JPEG OpenDML, 200 x 340 with millions of colors.
All of the other avi files in the example folder work fine. Does anyone have any ideas of what might be going on? Thanks.
Michael Froehlich
I am running LabVIEW 8.5 on a Windows 32 bit XP Service Pack 2 PC. I have DirectX 9.0c installed.

Hey Michael,
I am a little confused by your post. However, first things first. You can have an image that is of RGB type and it still appear B&W. So, that Flame.avi file, though it appears B&W, is actually a color picture. Instead of a single numeric value to represent a grey level, there are three numeric values (RGB) that combine to represent a grey level. Possible reasons for this I am not quite sure. It could be to give a larger avi file to better test the different codecs. In terms of playing the avi files again. This depends on the codecs being used and whether or not the tool you are using to play them supports that particular codec. You had mentioned that the other avi's work fine, particularly, which avi files are you referring to?
Also, if you manually read in the Flame.avi and then write it again using a codec to compress your avi do you see the same problems introduced by the AVI compressor Comparison Example?
Hope this helps.
-Ben
WaterlooLabs

Windows Server 2012 - Hyper-V - iSCSI SAN - All Hyper-V Guests stops responding and extensive disk read/write

We have a problem with one of our deployments of Windows Server 2012 Hyper-V with a 2 node cluster connected to a iSCSI SAN.
Our setup:
Hosts - Both run Windows Server 2012 Standard and are clustered.
HP ProLiant G7, 24 GB RAM, 2 teamed NIC dedicated to Virtual Machines and Management, 2 teamed NIC dedicated to iSCSI storage. - This is the primary host and normaly all VMs run on this host.
HP ProLiant G5, 20 GB RAM, 1 NIC dedicated to Virtual Machines and Management, 2 teamed NIC dedicated to iSCSI storage. - This is the secondary host that and is intended to be used in case of failure of the primary host.
We have no antivirus on the hosts and the scheduled ShadowCopy (previous version of files) is switched of.
iSCSI SAN:
QNAP NAS TS-869 Pro, 8 INTEL SSDSA2CW160G3 160 GB i a RAID 5 with a Host Spare. 2 Teamed NIC.
Switch:
DLINK DGS-1210-16 - Both the network cards of the Hosts that are dedicated to the Storage and the Storage itself are connected to the same switch and nothing else is connected to this switch.
Virtual Machines:
3 Windows Server 2012 Standard - 1 DC, 1 FileServer, 1 Application Server.
1 Windows Server 2008 Standard Exchange Server.
All VMs are using dynamic disks (as recommended by Microsoft).
Updates
We have applied the most resent updates to the Hosts, WMs and iSCSI SAN about 3 weeks ago with no change in our problem and we continually update the setup.
Normal operation
Normally this setup works just fine and we see no real difference in speed in startup, file copy and processing speed in LoB applications of this setup compared to a single host with 2 10000 RPM Disks. Normal network speed is 10-200 Mbit, but occasionally
we see speeds up to 400 Mbit/s of combined read/write for instance during file repair
Our Problem
Our problem is that for some reason all of the VMs stops responding or responds very slowly and you can for instance not send CTRL-ALT-DEL to a VM in the Hyper-V console, or for instance start task manager when already logged in.
Symptoms (i.e. this happens, or does not happen, at the same time)
I we look at resource monitor on the host then we see that there is often an extensive read from a VHDX of one of the VMs (40-60 Mbyte/s) and a combined write speed to many files in \HarddiskVolume5\System Volume Information\{<someguid and no file extension>}.
See iamge below.
The combined network speed to the iSCSI SAN is about 500-600 Mbit/s.
When this happens it is usually during and after a VSS ShadowCopy backup, but has also happens during hours where no backup should be running (i.e. during daytime when the backup has finished hours ago according to the log files). There is however
not that extensive writes to the backup file that is created on an external hard drive and this does not seem to happen during all backups (we have manually checked a few times, but it is hard to say since this error does not seem leave any traces in event
viewer).
We cannot find any indication that the VMs themself detect any problem and we see no increase of errors (for example storage related errors) in the eventlog inside the VMs.
The QNAP uses about 50% processing Power on all cores.
We see no dropped packets on the switch.
(I have split the image to save horizontal space).
Unable to recreate the problem / find definitive trigger
We have not succeeded in recreating the problem manually by, for instance, running chkdsk or defrag in VM and Hosts, copy and remove large files to VMs, running CPU and Disk intensive operations inside a VM (for instance scan and repair a database file).
Questions
Why does all VMs stop responding and why is there such intensive Read/Writes to the iSCSI SAN?
Could it be anything in our setup that cannot handle all the read/write requests? For instance the iSCSI SAN, the hosts, etc?
What can we do about this? Should we use MultiPath IO instead of NIC teaming to the SAN, limit bandwith to the SAN, etc?

Hi,
> All VMs are using dynamic disks (as recommended by Microsoft).
If this is a testing environment, it’s okay, but if this a production environment, it’s not recommended. Fixed VHDs are recommended for production instead of dynamically expanding or differencing VHDs.
Hyper-V: Dynamic virtual hard disks are not recommended for virtual machines that run server workloads in a production environment
http://technet.microsoft.com/en-us/library/ee941151(v=WS.10).aspx
> This is the primary host and normaly all VMs run on this host.
According to your posting, we know that you have Cluster Shared Volumes in the Hyper-V cluster, but why not distribute your VMs into two Hyper-V hosts.
Use Cluster Shared Volumes in a Windows Server 2012 Failover Cluster
http://technet.microsoft.com/en-us/library/jj612868.aspx
> 2 teamed NIC dedicated to iSCSI storage.
Use Microsoft MultiPath IO (MPIO) to manage multiple paths to iSCSI storage. Microsoft does not support teaming on network adapters that are used to connect to iSCSI-based storage devices. (At least it’s not supported until Windows Server 2008 R2. Although
Windows Server 2012 has built-in network teaming feature, I don’t article which declare that Windows Server 2012 network teaming support iSCSI connection)
Understanding Requirements for Failover Clusters
http://technet.microsoft.com/en-us/library/cc771404.aspx
> I have seen using MPIO suggests using different subnets, is this a requirement for using MPIO
> or is this just a way to make sure that you do not run out of IP adressess?
What I found is: if it is possible, isolate the iSCSI and data networks that reside on the same switch infrastructure through the use of VLANs and separate subnets. Redundant network paths from the server to the storage system via MPIO will maximize availability
and performance. Of course you can set these two NICs in separate subnets, but I don’t think it is necessary.
> Why should it be better to not have dedicated wireing for iSCSI and Management?
It is recommended that the iSCSI SAN network be separated (logically or physically) from the data network workloads. This ‘best practice’ network configuration optimizes performance and reliability.
Check that and modify cluster configuration, monitor it and give us feedback for further troubleshooting.
For more information please refer to following MS articles:
Volume Shadow Copy Service
http://technet.microsoft.com/en-us/library/ee923636(WS.10).aspx
Support for Multipath I/O (MPIO)
http://technet.microsoft.com/en-us/library/cc770294.aspx
Deployments and Tests in an iSCSI SAN
http://technet.microsoft.com/en-US/library/bb649502(v=SQL.90).aspx
Hope this helps!
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How to read, write and save a file?

Hello everybody,
I have a question about reading , writing and save something into a file (etc text file)
For example: I want to create a file of football in which there are many key words as: "football", "touch down", "quarterback", "ball", "linebacker", "coach", "player"...
Now i want to open to read, write one more word "head" ( synonym with "coach") and store it for using next time. How could i do that?
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still_learn

take a look in the API about FileInputStream and FileOutputStream

How to create files with read/write privileges for everyone?

I have two iMacs 7,1 (one with Snow Leopard and the other with Mountain Lion) in a local area wireless network.
I have shared the "documents" folder in the Snow Leopard iMac in order to have files available to the other iMac. The folder has read/write privileges for everyone.
When I create a new file in the shared "Documents" folder (for example a new Open office document, or a Keynote presentation) this file is by default "read/write" for the Administrator but only "read" for all the other users, so when I try to open it from the other iMac, I am informed that the file is "read only".
I can obviously change the privileges of the file in the information window, but I have to do on a file per file basis and this takes too long.
Is it possible to change settings in order to create files which are always "read/write" for everyone?
And, secondly, since I have several existing files whose privileges I should manually change one by one, is it possible to make global changes of their privileges?
Thanks in advance
Best regards

couple of different changes - 1st, if you want to share folders, doing your whole documents folder is not the best way. Since both your computers can handle AidDrop, that's what I would recommend - http://osxdaily.com/2011/11/14/how-to-use-airdrop-in-mac-os-x/ - as it create an instant Ad-Hoc network between the two computers and then let's it done.
A second possibility that may not be what you're looking for, is to use google drive or some similay cloud sharing app to sync the documents back and forth. both of these solutions will transfer the files well, but the airdrop may be simplest

How to programmatically read/write the range of a fieldpoint AI channel using LV

Is there a way to programmatically read/write the range of a fieldpoint AI channel using LV ? The example on NI site only permit you to have the name of the device and channels, not the actual set of the range of measure. Anybody has a VI (LV5.1 please)to share?
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If you are using the FieldPoint VI's (Open, Create Tag, Read, Write, Advise), you do not have the ability to change the range of a channel. If you have a FP-1000 or FP-1001, you can use the Optomux commands as described in the FP-1000/1001 Programmers Reference Manual (FieldPoint Optomux VI's are available at ftp://ftp.ni.com/support/fieldpoint/LVFPOpto/ ).
Alternatively, if you have an ethernet network module and LabVIEW 6i or later, you can use the ethernet configuration VI's that ship with FieldPoint Explorer 3.0.1.
Regards,
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Error 33172 occurred at Read & Write data transfer between two or more PF2010 controller

Hi,i need to do data transfer between two or more FP2010 controller.e.g. FP2010(A) & FP2010(B).
FP2010(A) need to transfer the measurement (from its I/O module) to FP2010(B) to do the data analysis.These data transfer should be synchronous btw two controller to prevent data lost.
From the vi used in the attachment,i encountered some problems at:
(1) Error 33172 occurred while publishing the data.Can i create and publish data under different item name?
(2) How to synchronies the read & write btw contorller?
All controller are communicating with each other directly without the need of a host computer to link them together
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Hi YongNei,
You were succesful in omiting enough information to make it very difficult to answer!
Please post your example.
Please tell us what version of LV-RT you are using.
Please define what you concider "fast data transfer".
Have you concidered mapping the FP tags of FP2010(A) to FP2010(B) and vise versa?
WHat exactly has to be syncronized?
If you have something that is close to working, share that.
Well, that as far as I can go with the info you have provided. Depending on the details, what you are asking could be anything from trivial to impossible with the currently available technology. I just can't say.
It would probably be a good idea to start over with a fresh question (sorry) because not many people are going to know what a a "
PF2010" is and I can not guarentee that I will be able to get back to you personally until next week-end.
Trying to help you get an answer,
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

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?

Avi read write example : playback missing chunk of data at regular intervals

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