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open-mmlab / mmaction2

OpenMMLab's Next Generation Video Understanding Toolbox and Benchmark
https://mmaction2.readthedocs.io
Apache License 2.0
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How to extract frame-level flow feature directly from untrimmed videos without building raw frames? #2749

Closed DgntYang closed 6 months ago

DgntYang commented 8 months ago

The doc issue

NOTE:

  1. I have searched related issues but cannot get the expected help.
  2. I have read docs in this repo for a long time.

Hi there, I am trying to extracting rgb and flow features for some large-scale datasets like(DAHLIA). However, due to disk capacity limitations, I am unable to save all raw frames locally.

I noted that this toolbox can load and decode videos using tools like decord (tsn_extract_video_feat_config.py), but didnot find it possible to extract flow feature from decoded untrimmed videos (with no function calls for denseflow during my debug). Are there any solutions can help sovling my dilemma?

Suggest a potential alternative/fix

No response

HaichenHe commented 6 months ago

Hi, I'm also looking for an answer to this question, can you share how you solved it?

DgntYang commented 5 months ago

Hello, I did't solve it but bought a 2T mechanical hard disk. Then I used denseflow to extract flow feature from local flow frames.