How to train on custom datasets

[Winter-Dry]

Thanks for your wonderful work!
I have a question about the jsons in data/movienet/anno folder, if I want to train on my own videos, how to prepare these files?
│─anno
│─ anno.pretrain.ndjson
│─ anno.trainvaltest.ndjson
│─ anno.train.ndjson
│─ anno.val.ndjson
│─ anno.test.ndjson
│─ vid2idx.json

Thanks a lot!!