Export Labeled Frames' H5 Analysis

Hi there,

I am trying to export the h5 data of the 1000 frames that I labeled, to use in training autoencoder. However, when I "Export Analysis HDF5", it exports 179681 frames (which is approximately the length of one full video).

After I cleaned up all the empty frames with numpy, only 771 frames left. I am quite confused and don't know how to make it right. Please help me if you can!