long duration video closed captions not syncing after few seconds of progesssion

[Mukti5F96]

I am doing a closed caption for an mp4 but the length of the video is very long, have added few CC's to it but the CC's are not syncing with the slide video properly there is lag always like the captions are moving much faster. any suggestions on how to fix it ? Have tried adjusting the timing but it never ceases to save it.

[Lilybiri]

Simple: avoid long videos. Distribute them over multiple slides.