Why is - CompItem.frameRate 29.9700012207031 for NTSC and not 30000/1001 = 29.9700299700299700... ?

It is perhaps a stupid question I have slept during in "Vidéo 101", but I'm still her asking:

Why is a CompItem NTSC (29.97) .frameRate 29.9700012207031 and not 29.97002997003 as 30000/1001 would assess to JS? (This is a deviation from 0.00002874932687..)

This of course also affects .frameDuration, which is 0.03336670003337 instead of the 0.03336666666667 expected (0.0333666...)


I thought that 30000/1001 was the way to derive 29.97 in. I'm wrong, or what is the explanation?

29.9700012207031 seems to derive from 982057/32768. (Why?)

Sorry, it's my fault. Back to 1994 when AE was in its infancy, someone told me that the true framerate of the video was "29.97 frames per second. No problem, I thought, that we already use a rational system for the moment internally. So I coded as 2997/100. Of course it should really have been 30 000 / 1001 like you mentioned above.

And it would be easy to change. But it would cause various problems with existing projects and existing expressions that may have workarounds in their code.

So we decided to leave it unchanged. For the most part, people don't notice. We do not have to take into account the tiny difference in the AE of body/SOUL connection more dynamic links or writing XMP metadata. Maybe someday change us in sufficient numbers and take on the conversion of project. But I don't think we could ever promise that he would do things for old projects (i.e. exact same results as before). The best transition plan could be to have a checkbox by project mode: 2997/100 or 30000/1001. And default to the correct value for new projects. But these things always have involuntary break, so until the pain becomes unbearable there will be probably left it as it is.

-DaveS

P.S. Is the new deviation of 29.97 floating-point because framerates internally are passed around point fixed 16.16. But we never do math with this value - it gets converted to the exact 29.97 internally, or we use the value duration, which is also an exact rational.

Tags: After Effects

Similar Questions

  • Why did did you publish 2.6 of Movie Maker for Vista and not for XP?

    Original title: Movie Maker

    Hey Microsoft, I want to ask U! Why did did you publish 2.6 of Movie Maker for Vista and not for XP?

    Hello

    Movie Maker 2.6 is for Windows Vista users whose computer cannot run the Vista's Movie Maker version. However if you want to upgrade the Movie maker for Windows XP you can try to download Windows live essentials.

    Windows Live Essentials includes seven major programs Windows Live to help you stay in touch with the people you care most, edit and share your photos, blog, browse, search, and help your kids safer online. Programs include Windows Live Messenger, Mail, Writer, photo library, Family Safety, toolbar, and Movie Maker and Outlook Connector, Office Live Add-in and Microsoft Silverlight.

    Check the minimum system requirements for Windows XP.

    http://explore.live.com/Windows-Live-Essentials-system-requirements

    To download Windows Live Essentials refer:

    http://explore.live.com/Windows-Live-Essentials

  • What photoshop is for beginners and not the expensive full version?

    What photoshop is for beginners and not the expensive full version?

    Depending on what you want to achieve, there are also 4 of Lightroom.

    Comparing CS6, Lightroom and elements, Adobe says:

    Q:  How Adobe Photoshop, Photoshop Extended, Photoshop Elements, and different software Photoshop Lightroom?

    A: Photoshop Elements 11 (US$ 99) is designed for those who is just getting started with digital photo and editing book powerful yet easy to use options that help you to organize, edit, create, share and protect your personal photos.

    Photoshop CS6 (US$ 699) is the professional standard to create and manipulate powerful images and Photoshop CS6 Extended (US$ 999) offer everything in Photoshop as well as tools for creating and editing objects and images in 3D.

    Photoshop Lightroom 4 (US$ 149) meets the needs of workflow of professional and amateur photographers, allowing them to import, process, organize and quickly introduce large quantities of digital photographs or develop a single image.

    And they also have a page that sums up the best uses for each product. This article even more deeply penetrates in the comparison. I hope it's useful!

  • Why are my electronic rejected by Qwest for Spam and not by another server, is here as a setting on Thunderbird cause?

    The problem seems to come and go. I can send messages to a single person on its Gmail account and the same message gets rejected by their account of Qwest.

    You will need to ask for century link why they treat your mail as SPAM. We could guess day and not hit their magic formula.

  • Photoshop CS6 extended primer not. It shows the scanning for presets and not go further?

    I have photoshop cs6 extended and used a few days ago. Now it will not start up. I shows that it is the digitization of the presets, but does not progress.

    Hi Dave,.

    Press ESC on the keyboard when Photoshop crashes scanning for presets and check if it starts over.

    If it isn't, he quit and press on and hold the SHIFT key while launching Photoshop > click Yes to ignore the loading of additional plugins and check.

    Kind regards

    Claes

  • Why is there ink (handwriting recognition) for OSX, but not for the iPad?

    I don't understand why Apple has not integrated for tablets handwriting recognition.  (After all, a Tablet is something of a slate...)

    The ink is not an Apple product.

    OS x and iOS are also 2 different operating systems.

    Write to the developer of the application to this topic.

    There are apps that can:

    1 example:

    https://iTunes.Apple.com/au/app/myscript-memo/id446368116?Mt=8

    Do a search on the iTunes App Store for other applications.

  • Why the Firefox icon on my desktop read1788 and not Mozilla?

    Recently on my desktop, Mozilla icon has changed to playback of Mozilla to 1788 (the right writing under blue the symbol for Mozilla Firefox). Is that what Mozilla has done or is there a problem I have to solve and if so how to I solve this problem?

    Also there is a free antivirus protection, which works with Mozilla?

    Thank you in advance for any help you can give me in this case.

    No, the shortcut on the desktop has not been renamed. First of all, make sure it is really pointing to Firefox and nothing else:

    1 right-click on the icon and choose Properties.

    2. in the Properties window, click the shortcut tab.

    3 make sure that the target field says

    "C:\Program Files\Mozilla Firefox\firefox.exe"
    

    4. If so, then click the general tab.

    5. in the top text box, enter the name you want for the shortcut.

    6. click the OK button when finished.

    I guess that you are having problems with the avast! Online Security add-on, it is why you have it turned off? Any add-on that scans all the links on each page is bound to add a delay of loading time. If you have more serious problems, you can ask for help on the Avast forum:

    This add-on is not required for virus protection and software malware. Here are a few alternatives for the features it offers:

  • Satellite P300D-10U - drivers for XP and not off cooling fan

    Nice day!

    I have a problem with installing the drivers under Windows XP SP2. Set up a new Windows XP SP2 operating system. How to install the driver on Windows XP?
    This is what must first establish a second...

    I have a problem with the cooling fan is not cut at all before when Vista was closed, now is not off, why? In addition, the sound was not full of volume and poor quality, probably also something of undelivered.

    Where can I download the driver for your sound card, the sound volume? Also, how to correctly install the driver on the site of works not to and a part of the former

    Thanks waiting for a response

    Hello

    > How to install the driver on Windows XP?
    Visit Toshiba's European driver, choose the model of laptop, download XP drivers and then install this
    Where is the problem?

    > I have a problem with the cooling fan is not cut at all before when Vista was closed, now is not off, why?
    After you install Power Saver for Win XP, change the speed of the CPU to Auto processing and performance of cooling module low.

    > Where can I download the driver for your sound card, the sound volume?
    There is not a special driver for volume!
    You need the card its just driver!
    To increase the volume and then go to control panel of-> sound-> reading and put all the settings of volume to the next level.

  • Why my PC now starts with black background and not authentic message?

    Original title: why PC starts in Mode safe?

    I have Microsoft Windows Vista Home Premium 64-bit Edition.

    Before going on vacation, I turned off all power. After that we are back and turned on PC, system booted in safe mode.  Screen has black background.

    Message reads; Windows Vista (TM) - Build 6002 - this copy of Windows is not genuine.

    What could have happened? PC was working fine before our departure.

    Moved from Vista Performance and Maintenance Forum.

    How to activate Windows 7 or Vista manually (activate by phone)
    http://support.Microsoft.com/kb/950929/en-us

    1) click Start and in the search for box type: slui.exe 4
    (2) press the ENTER"" key.
    (3) to select your "country" you are in the drop-down list.
    (4) choose the option "activate phone".
    (5) stay on the phone * do not select/press any option * and wait for a person to help you.
    (6) explain your problem clearly to the support person.
    (7) the person must give you a confirmation ID, copy it down on paper,
    (8) check that the ID is correct in reading the support person.
    (9) to enter the ID number, then click 'Next' to complete the activation process.

    Activation and registration of a Microsoft product
    http://support.Microsoft.com/?kbid=326851
    Windows activation: (888) 571-2048
    (888) 725-1047 or 800-936-5700

    What's the relationship between activation and genuine Windows?
    http://Windows.Microsoft.com/en-in/Windows7/what-s-the-relationship-between-activation-and-genuine-Windows

    What is the validation, and how does it work?
    Windows 7: http://windows.microsoft.com/en-us/windows/help/genuine/what-is-validation?os=win7
    Vista: http://windows.microsoft.com/en-us/windows/help/genuine/what-is-validation?os=winvista

    Authentic Microsoft software program privacy statement
    What data is collected?
    http://Windows.Microsoft.com/en-us/Windows/genuine/privacy-statement

    -Product key of letters and numbers-

    Not confused the letter B with the number 8, the letter Q with the letter O.
    the letter G and the number 6.

    A, E, I, O and u are not used.

    ----------------------------  Alternatives -------------------------------------

    To enable the use of the phone

    1. open Activation of Windows by clicking on the Start button, right click on computer, clicking Properties.
    then by clicking on activate Windows now. ?

    2. click on show me other ways to activate.

    3 type your Windows 7 product key, and then click Next.

    4. click on use the automated telephone and then click Next.
    If you are prompted for an administrator password or a confirmation, type the password or provide confirmation.

    5. click on the location nearest you from the drop-down list, and then click Next.

    6. call one of the available phone numbers listed. An automated system will guide you through the activation process.

    7. When prompted, enter the installation ID that is listed on your screen in your phone keypad.

    8 Note the confirmation ID the phone system gives you.

    9. under the terms of step 3, type the confirmation ID in the space provided, click Next, and then follow the instructions.

    10. If the activation is not successful, stay on the line to be transferred to a product activation agent who can help you.

    How to contact a Microsoft Product Activation Center by phone
    http://support.Microsoft.com/kb/950929

    Activation and registration of a Microsoft product
    http://support.Microsoft.com/?kbid=326851
    Windows activation: (888) 571-2048
    (888) 725-1047 or 800-936-5700

    Microsoft Activation centers worldwide telephone numbers:
    http://www.Microsoft.com/licensing/existing-customers/activation-centers.aspx
    (This site is for activating Volume License, but if you call, they will help you)

    The phone number is not working:
    Microsoft Worldwide contacts: http://www.microsoft.com/worldwide/default.aspx

    Learn about Activation:
    http://TechNet.Microsoft.com/en-us/library/ff793423.aspx

    J W Stuart: http://www.pagestart.com

  • Why has Adobe decided to do cloud subscription and not continue with the Collections?

    I know that it is hard to predict the future and trends. And I know wanted offer convenience, but it's an inconvenience when you do not offer a time offer without continually having to pay for a product. Yes. Adobe is an exceptional product. But you could potentially lose a good customer because continually have to pay for a product year after year without ever owning. People prefer to invest a lump sum, then ending up paying more in the long term. I just wanted to know why not continue with CS 7, 8, 9. Or if you want clouds. Let a time buy and be able to have available for use without the CD.

    You can always buy cs6 (Creative Cloud now includes the features of Creative Suite Master Collection and Design Premium)and a handful of other adobe programs.

  • Cc of Lightroom will not import my files, it is said that they are not recognized, why it doesn't matter that a DNG and not a raw file, I use a canon 5 3

    Can someone tell me why Lightroom cc wants to import my files under a DNG, I used to import as a raw file, it says the files are not recognized, I use a Canon 5 3 and never had the problem before, he said actually the Raw Format is not supported in Lightroom.

    Thanks in advance John.

    Hi, dj_paige,

    I managed to sort it out, the problem was when I used my Kingston card reader to import my images in LR Cc, it would not recognize the file format, so when I thought a little more, tired of importing directly from my 5 d 3, it worked very well, so now I need to find a card reader supports LR CC ,

    Thanks for your reply, regards, John.

  • BT Stack selling or free license - but not for sale and not free

    Hi team Toshiba

    You did a good job over the years with the bluetooth stack. I think that your development team is the only professionally developed battery bluetooth for windows.

    It's happened that I bougt garage a SONY VGN-BX197XP laptop a few years ago, I think it was late 2005. During the assessment process that I had checked if the bluetooth of this SONY laptop battery Toshiba chips and drivers, because I knew then your battery was the best developed with profiles of work most.

    During my first session of upgrade, I learned, that your support chips Toshiba support policy in other mobile providers is not customer friendly. Because you show us that the battery works 30 days very well, but then don't give us not a chance to get a license without end or free, or through the purchase.

    Two years ago I had the luck that I was able to download the TOABLT-01071611 - UN.exe (it was the pile of 4.00.31 20060810) Sony. But unfortunately, it is not possible to open the exe file.

    So I have to take back you the delivered Original Version from 2005.09.09 - which means I have neednot install battery BT no more, because this rather old stack does not sufficiently stable.

    Maybe I could get a PN to use beyond battery last 30 days, if your company sells this little piece of good software. :-) pls let me know

    Michael

    So if you use a Toshiba laptop not then it's probably a good idea to also check its Web site for her.
    So I think that the software is suitable for this product and is probably the best choice.
    I did a quick search and found a version 5 Bluetooth stack that is newer than the one you mentioned.

    Maybe you can find a newer version even if you check the site more in detail.

  • Qosmio G30-175: why the properties system tell Media Center 2002 and not 2005?

    Hello

    I have a qosmio g30-175, it says on the sticker of the authentication windows on my laptop computer Media center 2005, the problem is that when I check the system properties in Control Panel, it says units media center 2002 SP2. I find it confusing, Toshiba gave me the wrong version, or is it quite normal.

    I installed windows by using the recovery disk of the product came with my computer.

    Thank you.

    Don't worry man. Everything is ok! You have a MCE 2005 version

    You have simply checked versions MCE in the wrong way!
    If you want to check the MCE versions open media center, click on "settings", then click "about media center". The version of MCE will appear.

    What you're watching now is the version of XP/OS. The XP is the Foundation for MCE. ;)

  • Why my laptop detects only my neighbors wifi and not mine when it starts?

    I have a laptop Dell Inspiron N5050 and in recent months he has struggled to detect and connect to my wifi, but it can detect surrounding wifi. I had to wait five minutes before he actually found my wifi, but then it does not connect to it for another 2 minutes because of "a problem with the access point. Then after that it connects to the wifi and works very well. Sometimes it will detect and connect to my wifi after the laptop is turned on, but it takes 5 minutes for the laptop to actually connect to the wifi.  I need a permanent solution to this problem. I uninstalled and reinstalled my network card. I unplug and plug the router. I went to power management and unchecked "allow this computer to turn off device to save power." I changed my power supply with high performance options. I disabled my anti virus software. My wireless driver is updated. After doing all these things, my laptop still has a problem. The router works fine. My iphone, kindle and windows 8.1 Dell laptop my brother can connect to it.  What should I do?

    Hello

    Thanks for posting your question on the Microsoft community.

    I would like to know some information about the problem so that we can help you better.

    You made any hardware or software changes on your computer before the show?

    Thank you for details on the question and your efforts to resolve.

    This problem can occur either because of corrupt network drivers or incorrect network settings.

    I would suggest trying the following methods and check if it helps.

    Method 1:
    Run the network troubleshooting and check.
    Reference:
    Using the troubleshooter from network in Windows 7
    http://Windows.Microsoft.com/en-us/Windows7/using-the-network-troubleshooter-in-Windows-7

    If this does not help, use method 2.

    Method 2:
    Reset TCP/IP and check the issue.
    Refer to this article:
    How to reset TCP/IP using the NetShell utility
    https://support.Microsoft.com/en-us/KB/299357

    I hope this information helps.

    Please let us know if you need more help.

    Thank you

  • How to apply specific operations for rooted and not anchored image separately...

    I would like to make a few changes to image rooted and non-rooted separately...

    so first of all, I want to find image anchored and non-anchored...

    Hello

    Lines of 50-69:

    if(img[i].parent.parent.hasOwnProperty("baseline"))
    

    Cannot manage what is this loop:

    //...
    for(var j=0 ; j<3; j++)
        {
    //...
    

    created for?

    I suggest to remove it (if agree ==> last line delete {""} "") so

    Jarek

Maybe you are looking for