Micofmag7,
Let me just ask, are you sure you need closed captions for VLC player? It will use sidecar files for the same purpose and does not need to have the captions embedded. I have not had consistent results with VLC and embeds or sidecars - except that a simple srt with the same name, in the same folder, almost always works.
Here's my understanding of the current PR embed status. PR will embed 608 to Quicktime and MXF OP1a files. It will embed 708 to only MXF. I believe that based on other threads and feature requests, PR has never embedded 708 captions to Quicktime. See this pre-2020 staff post:
https://community.adobe.com/t5/premiere-pro-discussions/need-to-change-caption-stream-from-cea-608-to-cea-708/m-p/6871554#M32672
Prores does support 708, and there have been feature requests to add it to PR Prores export. But this has not happened.
PR will embed both tracks even though only one is "active" in the timeline. Some users have had other issues with embed exports, however, so test your full workflow. Part of the confusion has been that MediaInfo was not reporting the presence of embedded caption tracks accurately. Reimport to PR to see if they embedded.
Stan
Hi Stan, the magic has worked. My error was in thinking if I exported a srt file and placed it in the same folder as the mxf file , VLC would pick it up. This morning I exported a sidecar file in srt format and BOOM.. The Magic happened. Thank you so much. Mico