Slow import of assets containing closed captioning

New Here ,
Nov 25, 2021 Nov 25, 2021

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I am attempting to import (link) a 90 minute plus asset using Premiere Pro v. 15.4.2 for on-air versioning.  I have two Full HD OP1a .mxf assets that are identical, except one contains Closed Captioning on line 18 and the other does not..
 
The asset without CC is acquired in less than a minute and the version containing CC requires more than 10 minutes to accomplish the same task. It makes no difference if Preferences > Media > Include Captions on import option is checked or unchecked. The outcome is the same when CC is present..
 
The additional time is affecting workflows... please advise.
Thank you
 
 
 
 
TOPICS
Editing, Formats, Import, Performance

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Adobe Community Professional ,
Nov 25, 2021 Nov 25, 2021

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I think at least one other user reported that turning "include captions" off did not change this behavior.

 

I'd file a bug report:

https://adobe-video.uservoice.com/forums/911233-premiere-pro

 

But turning it off would be the same as importing the version without the caption, right?

 

Is the captioned version importing correctly?

 

Stan

 

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New Here ,
Nov 26, 2021 Nov 26, 2021

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The closed captioning is passed correctly, intact and is exportable.

 

Seeing that assets of extended duration that DO NOT contain closed captioning are aquired in a more reasonable amount of time (less than 1 minute), I feel the problem is a result of attempting to import (link to) those assets of extended duration that do contain closed captioning, whether or not cc is being stripped on import. To be clear - engaging or disengaging the "Preferences > Media > Include Captions on import" option has no effect on the duration of import - which requires at least 10x more time.

 

I have been unable to find a buried menu that could address this issue and will file a bug report. Thank you for the link.

 

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Adobe Community Professional ,
Nov 26, 2021 Nov 26, 2021

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I don't think it is an issue of "linking," but that may be a matter of semantics. Captions are encoded in the Project File, as hex code. a) It should be possible to turn off import of the captions. But if you need them in the project, you wouldn't have them without importing them separately. b) It should not take that much longer no matter the mechanism.

 

Post a link to your bug report so it can be upvoted.

 

Stan

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New Here ,
Nov 26, 2021 Nov 26, 2021

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Indeed, embedded metadata such as closed captioning is a reality and its presence appears to be exponentially slowing down the import of the asset whether or not the option to import the its embedded closed captioning is chosen or not.


Seeing that here in Canada the broadcast of closed captioning is mandated by the CRTC, format editors must use the cc or flag it to be added to the programming. I have never witnessed work flow being impacted by closed captioning's presence, so it has me scratching my head. This issue must be a bug or there is a undocumented setting that must be addressed...


Here is the link to the report...

https://adobe-video.uservoice.com/forums/911233-premiere-pro/suggestions/44497326-very-slow-import-o...

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Adobe Community Professional ,
Nov 26, 2021 Nov 26, 2021

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Thanks for the info. I'll try to test with something long, but my test with a 6 minute sample imports too fast to show anything. I used exports from PR with no captions, embed 608, and embed 608 and 708.

 

What is your source and what type of captions?

 

Stan

 

 

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New Here ,
Nov 26, 2021 Nov 26, 2021

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Thank you for your help Stan.


In Toronto shows are formatted using Avid Media Composer and EDIUS but the specifications should be same throughout the network. Montreal started using Premiere Pro a few weeks ago using Avid NEXIS for media and Project storage. I have personally used NEXIS with After Effects obtaining excellent results in Full HD projects, UHD, 8K and higher.


The files in question should be compressed to an minimum XDCAMHD (1920 x 1080), CBR file @ 50Mbps, Long GOP, 4: 2: 2 Profile, High Level with a frame rate of 59.94 and is contained in a MXF (OP1a) wrapper.


Closed captioned is EIA-708B and compliant with EIA-608B. The Closed Captioning is embedded in the digital video signal (VANC) as per SMPTE334M-1:2007. The captions shall be of EIA-708 data and backward
compatible in EIA-608 mode.


I will email the editors in Montreal to confirm.

Cheers,
mfl

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