glide 只选择视频，低端机极易OOM

## Current use version？
#### 当前使用的版本是多少？
3.0.7
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## Will this problem occur in demo?
#### Demo能否复现这问题？
能
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## Describe the problem or provide an error log？
#### 描述问题或提供错误log？
图片没有问题，应该是加载视频封面消耗了很多内存
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Reproduce the issue in the demo using video-only selection on a low-end Android device, then trace the video-cover loading path implicated by the report. Confirm the memory growth and identify a measurable fix for the out-of-memory failure; no source files or tests are named in the issue.

Written by the indexing model from the issue text.