How to generate th14_i3d2s_ft_info.json?

[ttgeng233]

Hello, thank you for your good work!
I want to know how to generate th14_i3d2s_ft_info.json for thumos14 video features. And how to compute ''feature_length", "feature_second" and "feature_fps" for each video?

[yyccli]

The information in this json file mainly depends on how you extract video features from raw videos.
feature_length can be read directly from the video feature files.
In TadTR paper, it says 1 video feature is extracted from 8 frames with no overlap from the raw video, which means if the raw video is 30fps, then its feature fps is 30/8=3.75.
When you get feature_length and feature_fps, the feature_second is computed by feature_length / feature_fps.

[xlliu7]

@yyccli's explanation is correct.