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facebookresearch / VMZ

VMZ: Model Zoo for Video Modeling
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About video list for feature extraction #104

Open suminlee94 opened 4 years ago

suminlee94 commented 4 years ago

I have some questions about video list file for feature extraction. I saw your answer of previous issue where https://github.com/facebookresearch/VMZ/issues/11#issue-331330979, but I'm still not sure about my understanding.

There are four categories in video list : org_video, label, start_frm, video_id And I want to use extract_features.py for untrimmed video datasets. Here is my questions.

1) Does "Clip" you used correspond to "snippet" meaning several successive frames? 2) As I understand, I should use different video_id for different clips in one video for feature extraction of untrimmed video. Right? 3) When using video_id, Is the start_frm meaning the target frame of label? And that's why you use 1 frame clips in tutorial.

Thank you.

yushuinanrong commented 4 years ago

I haven't tested the code but I would try to answer your questions based on my own understanding.

  1. Yes
  2. I think the answer is Yes.
  3. start_frm is the frame index of the starting frame of a short clip/snippet.