Significant RAM usage increase on performing a get batch of 4K video
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Description
decord version (installed via pip): 0.6.0
OS: Ubuntu 20.04
Big bunny video downloaded from https://4kmedia.org/big-buck-bunny-4k-demo/
My code is the following:
```
import decord
vr = decord.VideoReader()
batch = vr.get_batch(range(3))
```
as soon as I try to get a batch of frames, the RAM usage builds up beyond 30 GB and the process gets killed.
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