Annotation Frame amount does not align with clipped image number

[Eden-Wang1710]

Hi, I encountered an issue while processing one video. After downloading and converting the video to individual frames, I noticed that the number of annotations doesn't align with the number of processed images.

"videoid": "TgavkeWrV7U"
According to the JSON file, this video has 4762 seconds. The first 90s and last 30s should be discarded. So it should be 46420 frames left after processed.

But After proceesing, I find 46400 images(0.jpg to 46399.jpg) in my folder. And the annotation in split7 json file has 46061 frames, where the last one is from 46060.jpg to 46099.jpg. They have 30 second difference.

It's acceptable if this 30-second discrepancy is from the end of the video. But it would be problematic if it's from the beginning, as that would affect the data alignment. Since I only download one video, I'm not sure if other videos also have this problem. Could you kindly confirm this? Thanks a lot!

[GihhArwtw]

Hi @Eden-Wang1710

Thanks for your report.
We checked the dataset and yes the 30-second discrepancy is from the end of the video.
There are also some other videos for which we further discarded the last 60 seconds instead of 30 seconds at the end of them, but the current metadata still works since they are already discarded in the annotation file.

[GihhArwtw]

We now updated the Metadata Google Sheet for videos with longer length to be discarded at the ending. But still, the former version of metadata works well since frames are already discarded in the anno file. So you could still choose to use the former version.

[Eden-Wang1710]

We now updated the Metadata Google Sheet for videos with longer length to be discarded at the ending. But still, the former version of metadata works well since frames are already discarded in the anno file.

OK, thanks for your reply!