Closed Captions

[Tony Quinsee-Jover]



Hi all,

I posted this on the Avid-L but no responses to date so I thought I’d ask here in case anyone knows the answer  

I've never played with CC before but I think I'm okay now with generating them on the Media Composer timeline. My question is about export. If I simply use my standard MXF file output template do I need to set anything else in order to have the TX file comply with the following specs? Thanks in advance.

Subtitle captions are required to be OP-47 compliant within the MXF file according to SMPTE ST 436-1 for VANC data.

The subtitles are required to be on Line 12 / Field 2 (577) / Teletext PAGE 888 and should not be present in the first or last 5 frames of the commercial. 

Packet31 test data and dummy headers should not be present.

Cheers,
Tony

Sent by magic over t'interweb

[Jim Fink]

Hi Tony, just did some of those this afternoon using Pro Rez, QuickTime, and then under captions on export in premiere media encoder under the captions tab. I select enbed in File or you can send a standalone caption SCC file but that gets more complicated. I also often just send a burned in caption version so that they’re always there in case somebody needs it to be easy. 

Sent from a small keyboarded device ! Excuse iPhone typo's

On Jan 16, 2026, at 1:43 PM, Tony Quinsee-Jover <to...@hdheaven.co.uk> wrote:



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[Jim Fink]

Hi Tony, good to hear from you adding to my previous note. Some formats won’t accept embedded captions as an MP4, which is when someone needs a small file with captions. I send them a burn in captions MP4.

Sent from a small keyboarded device ! Excuse iPhone typo's

On Jan 16, 2026, at 3:26 PM, Jim Fink <j...@ncdm.tv> wrote:

Hi Tony, just did some of those this afternoon using Pro Rez, QuickTime, and then under captions on export in premiere media encoder under the captions tab. I select enbed in File or you can send a standalone caption SCC file but that gets more complicated. I also often just send a burned in caption version so that they’re always there in case somebody needs it to be easy. 

[Tony Quinsee-Jover]

Hi Jim,

For UK tx the fie has to be an mxf to a specific format with the CC embedded as per the specs I showed. 

The delivery company will do it in-house for me but they charge £250 per commercial (about $330 US) so I figured I’d have a go myself. 

Cheers,

Tony

Sent by magic over t'interweb

On 16 Jan 2026, at 20:28, Jim Fink <J...@ncdm.tv> wrote:

Hi Tony, good to hear from you adding to my previous note. Some formats won’t accept embedded captions as an MP4, which is when someone needs a small file with captions. I send them a burn in captions MP4.

To view this discussion visit https://groups.google.com/d/msgid/ds-list/7CE9661B-0BC8-444D-A50C-E9CD3223126B%40ncdm.tv.