Latest post Thu, Apr 16 2015 4:54 PM by Mark Spano. 1 replies.
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  • Wed, Apr 15 2015 11:03 AM

    2:2:2:4 cadence 29.97 play as 2:2:2:2 at 23.976 in an Avid Symphony

    29.97fps to 23.976fps with cadence removal.


    In an Avid Bin, select under the "Field Motion" column:


    cadence 2:2:2:4
    select "Progressive" to remove a 2:2:2:4 cadence and have the video playback smooth

    cadence 2:3:3:2
    select "2:3 Film" to remove 2:3:3:2 and have the video playback smooth

    cadence 2:3:2:3
    select "2:3 Film" and promote motion effect to a "Timewarp Effect"and then choose cadence pattern "AA BB BC CD DD" to remove the classic 2:3:2:3 cadence. The video can then playback smooth






    circled and settings reveal extraction making each progressive video frame





    The original 48,000 samples per second of audio plays in sync with the 23.976 frames per second of video.
    Extracting pictures from a 29.97 frame per second count, with exact precision placing progressive video frames in a 23.976 frame per second count.


    Thoughts about Letters "A","B","C","D":

    "A" - 1 unique progressive video frame
    "B" - 1 unique progressive video frame
    "C" - 1 unique progressive video frame
    "D" - 1 unique progressive video frame




    About the Letters "A","B","C","D" with the numbers of either "1" and "2" added:


    "A1" - odd numbered horizontal lines make up half of an original frame "A"
    "A2" - even numbered horizontal lines make up half of an original frame "A"
    "B1" - odd numbered horizontal lines make up half of an original frame "B"
    "B2" - even numbered horizontal lines make up half of an original frame "B"
    "C1" - odd numbered horizontal lines make up half of an original frame "C"
    "C2" - even numbered horizontal lines make up half of an original frame "C"
    "D1" - odd numbered horizontal lines make up half of an original frame "D"
    "D2" - even numbered horizontal lines make up half of an original frame "D"





    Thoughts about Numbers "2","3", and "4", they are describing something:


    "2" - 1 progressive video frame
    "3" - 1 progressive video frame in 3 fields of interlaced video with 1 repeated field
    "4" - 1 progressive video frame in 4 fields of interlaced video with 1 repeated frame







    A look at the settings to configure:



    2:2:2:4 cadence removal:
    In the Avid Bin, assign the Master Clip(s) "Progressive" by clicking under the "Field Motion" column.

    Both the odd numbered horizontal lines of video also known as "field 1" and the even numbered horizontal lines of video also known as "field 2" gets extracted to make up each new progressive video frame. "Progressive" setting selection under the "Field Motion" column removes a 2:2:2:4 cadence where the Avid skips every fifth frame making smooth playback from what was jerky video every fourth and fifth frame.




    2:3:3:2 cadence removal:
    In the Avid Bin, assign the Master Clip(s) "2:3 Film" by clicking under the "Field Motion" column.

    "2:3 Film" selection, automatically use a field 1 and a field 2 to make up each progressive frame. Avid Symphony is set for these master clips to make a 2:3:3:2 five frames into 2:2:2:2 four frames.




    2:3:2:3 cadence removal:
    In the Avid Bin, assign the Master Clip(s) "2:3 Film" by clicking under the "Field Motion" column.
    Step 1) load the clip into the "Source Monitor"
    Step 2) Make sure and start the cut using an "A" frame, and cut it into a sequence loaded into the "Record Monitor".
    Step 3) On the Record Side Timeline, park the blue position indicator on the clip with the 2:3:2:3 cadence and go to the "Tools Menu > Motion Effect Editor"
    Step 4) In the "Motion Effect Editor" click the "Promote" button.

    The promote button turns the motion effect into a "Timewarp" effect.

    configure the following in the "Motion Effect Editor"
    "Type: Both Fields"
    "Source Film With 2:3 Pulldown" 
    "2:3 Pulldown: AA BB BC CD DD"






    "Timewarp" effect can be set-up to remove video cadence too!!!:
    (circled gets pulled as selected)








    Setting-up the Avid Media Composer with the Symphony option to display:

    First: new 23.976 fps Avid Project.






    Second: Set-Up Video Quality Menu Choosing A Both Field View:






    Third: Go to the Avid User "Render" Settings make sure there is not a check mark next to the words "Use frame blending in Motion Adapters".

    when changing render settings please clear the source and record monitors















    Creating a new master clip with automatic cadence removal:

    If one would like to create a new master clip at the project frame rate, the "Transcode > Convert" command can accommodate. (I need to test this out further. Here are some test results)



    Using the "Transcode > Convert Command" on Avid Media Composer Version 8.3.1:

    If I select a master clip with a complete cadence pattern start of 2:2:2:4 or the 2:3:3:2 with the proper "Field Motion" column selection: So far the transcode > convert command for the master clips are able to be converted to 23.976 frames per second and have perfect clean frames absent of blending artifacts.


    If I select a sequence or a subclip and perform the "Transcode > Convert" command: When performing the transcode convert command please test and look at the results. ---> for sequences and subclips "Edit Start" and "Handle length" are a factor for results.

    Here are a couple of successful examples with using "Transcode > Convert" command on a sequence: 

    Example 1: If performing a 2:3:2:3 cadence removal and one would like to use the transcode>convert command my repeated tests are showing me that an "A" frame edit should be at least after frame 10 (meaning do not use the first 10 frames of a master clip in the edit) and later use a "3" frame handle length. This seems to work with clips of various durations. 

    Example 2: If performing a "BB BC CD DD AA" editing on the "B" with "1" frame handle in the transcode>convert command is working.











    Frames and fields used for essence extraction from the 29.97 frames per second source.

    2:2:2:4 cadence removal extraction test results:

    master clip "Progressive" populated under "Field Motion" column
    29.97fps ---> 5 Frames ---> 4 Frames 23.976 fps
    TC 01:00:00:00 field 1 and field 2 lands to form ----------> TC 01:00:00:00
    TC 01:00:00:01 field 1 and field 2 lands to form ----------> TC 01:00:00:01
    TC 01:00:00:02 field 1 and field 2 lands to form ----------> TC 01:00:00:02
    TC 01:00:00:03 field 1 and field 2 lands to form ----------> TC 01:00:00:03
    TC 01:00:00:04 - **************


    2:3:3:2 cadence removal: A master clip with "2:3 Film" selection under the column "Field Motion" transfer results:
    29.97fps ---> 5 Frames ---> 4 Frames 23.976 fps
    TC 01:00:00:00 field 1 and field 2 lands to form ----------> TC 01:00:00:00
    TC 01:00:00:01 ******* *** field 2 lands to form ----------> TC 01:00:00:01
    TC 01:00:00:02 field 1 *** ******* lands to form ----------> TC 01:00:00:01
    TC 01:00:00:03 field 1 and field 2 lands to form ----------> TC 01:00:00:02
    TC 01:00:00:04 field 1 and field 2 lands to form ----------> TC 01:00:00:03


    2:3:2:3 cadence removal: A master clip with "2:3 Film" selection under the column "Field Motion" transfer results: 
    29.97fps ---> 5 Frames ---> 4 Frames 23.976 fps
    TC 01:00:00:00 field 1 and field 2 lands to form ----------> TC 01:00:00:00
    TC 01:00:00:01 field 1 and field 2 lands to form ----------> TC 01:00:00:01
    TC 01:00:00:02 ******* *** field 2 lands to form ----------> TC 01:00:00:02
    TC 01:00:00:03 field 1 *** ******* lands to form ----------> TC 01:00:00:02
    TC 01:00:00:04 field 1 and field 2 lands to form ----------> TC 01:00:00:03
    2 field extraction is done by promoting the Motion Effect and configure the fallowing in the Motion Effect Editor:
    Type: "Both Fields"
    Source: "Film With 2:3 Pulldown"
    2:3 Pulldown: "AA BB BC CD DD"



    Warning: (As far as I can tell so far) if "Interlaced" in the "Field Motion" for master clips with a frame per second of 29.97 in a 23.976 fps project is only converting using a single field for the transfer. 

    "Field Motion" setting configuration only uses 1 field for 1 progressive frame
    cadence removal: A master clip with the "Field Motion" of "Interlaced"
    When using the transcode convert command if the "Field Motion" column is populated with "Interlaced" the Avid creates a single field sample in a progressive frame loosing 1/2 of the horizontal lines in the transfer.: 
    field 1 - 01:00:00:00 30fps 01:00:00:00 23.976 fps
    field 1 - 01:00:00:01 30fps 01:00:00:01 23.976 fps
    field 2 - 01:00:00:02 30fps 01:00:00:02 23.976 fps
    field 2 - 01:00:00:03 30fps 01:00:00:03 23.976 fps
    field 1 - 01:00:00:05 30fps 01:00:00:04 23.976 fps
    field 1 - 01:00:00:06 30fps 01:00:00:05 23.976 fps
    field 2 - 01:00:00:07 30fps 01:00:00:06 23.976 fps
    field 2 - 01:00:00:08 30fps 01:00:00:07 23.976 fps
    field 1 - 01:00:00:10 30fps 01:00:00:08 23.976 fps




    I hope this is helpful!!!

    - scott freeman


    Test using Avid Media Composer version 8.3.1 & 8.4
    Please test the Media Composer and each version to make sure you get the desired results.

    http://www.metadatalinks.com [view my complete system specs]
  • Thu, Apr 16 2015 4:54 PM In reply to

    Re: 2:2:2:4 cadence 29.97 play as 2:2:2:2 at 23.976 in an Avid Symphony

    Seems like this will be a big help. I get lots of sources where bad pulldown has been added, and often I have to remove it with edit macros and other workarounds. I'll try this next time I get it, as I'm sure it would save lots of time. Thanks!

    Mac OS X 10.9.5, MC/Symphony v8.4.2, Nitris DX, AJA ioExpress Sony HDCAM-SR SRW-5500 Panasonic AJ-3700HD D5 etc. [view my complete system specs]
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