# FHO LTA slowfast features missing for some videos

**URL:** <https://discuss.ego4d-data.org/t/fho-lta-slowfast-features-missing-for-some-videos/243>\
**Category:** Ego4D Challenges\
**Created:** [March 24, 2023, 2:22pm UTC](https://discuss.ego4d-data.org/t/fho-lta-slowfast-features-missing-for-some-videos/243 "2023-03-24T14:22:01Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Fede\_unige](https://avatars.discourse-cdn.com/v4/letter/f/ce7236/32.png) [@Fede\_unige](https://discuss.ego4d-data.org/u/Fede_unige)\
**Post date:** [March 24, 2023, 2:22pm UTC](https://discuss.ego4d-data.org/t/fho-lta-slowfast-features-missing-for-some-videos/243/1 "2023-03-24T14:22:01Z")

</div>

Hello,  
**I downloaded version 2 for the fho lta (long term anticipation) challenge: features (slowfast) and annotations but in the features some videos are missing.**  
e.g.

```auto
video uid = 44a173ba-e836-4efc-b485-e94d6bbafa8e
video uid = bedaa131-deae-4279-9fd4-5b6ab552644c

```

don’t have pre-extracted features.

Maybe others are missing but I did not check…  
I tried also to download again the features but it says that I up to date with the server.  
Can you check if it is only a problem on my side or not?

(PS metadata file does not download automatically if v1 metadata is already present in folder, as stated in doc)

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<div class="post-metadata">

**Author:** ![miguelmartin](https://avatars.discourse-cdn.com/v4/letter/m/f19dbf/32.png) [@miguelmartin](https://discuss.ego4d-data.org/u/miguelmartin)\
**Post date:** [March 27, 2023, 5:11pm UTC](https://discuss.ego4d-data.org/t/fho-lta-slowfast-features-missing-for-some-videos/243/2 "2023-03-27T17:11:55Z")

</div>

Hi Fede,

Apologies for the missing features. I honestly forgot to extract them out for the release. I can get them for SlowFast within a couple of weeks (currently busy with a lot of items).

Kind regards,  
Miguel.

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<div class="post-metadata">

**Author:** ![miguelmartin](https://avatars.discourse-cdn.com/v4/letter/m/f19dbf/32.png) [@miguelmartin](https://discuss.ego4d-data.org/u/miguelmartin)\
**Post date:** [March 27, 2023, 7:08pm UTC](https://discuss.ego4d-data.org/t/fho-lta-slowfast-features-missing-for-some-videos/243/3 "2023-03-27T19:08:02Z")

</div>

Correction here.

These videos are V1 videos, and therefore do have features extracted for them. For the new videos in V2, I have not exacted features for them, but the videos in FHO/LTA are not new V2 videos.

Unfortunately the metadata for FHO / LTA does not seem to cover all the video uids in the benchmark, hence why when downloading, you have some missing features.

I instead recommend downloading all the features. In other words, remove your `--benchmarks` filter from the command line, i.e. run:

```bash
ego4d --output_directory=<out-directory> --datasets slowfast8x8_r101_k400

```

A couple of comments:

- I do recommend using omnivore video features. If you’re after performance, these are much better features for downstream tasks. Of course if you’re wanting to do an ablation study, ignore this comment.
- If you’re trying to save space, there are the FP16 omnivore video features available. I believe the total storage size of the FP16 features is around 75GB (don’t quote me on the exact number)

I hope that’s helpful and unblocks you.