[Feature] 可以让多个背景图如同幻灯片般切换（或者支持MP4）
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enhancement
- Dominant language
- Java
- Stars
- 10.1k
- Forks
- 934
- Avg merge
- 1d 5h
- Merged PRs (30d)
- 82
Description
概述 | Summary
一开始试着做个PPT录屏转动图，目前支持gif和apng格式的背景，可是一旦原视频质量一高，导出的动图的质量就让人堪忧，不如直接出一个可以自动切换背景图片的功能，选中一个文件夹即可（我不太了解编程这方面太多的相关知识，如果这个功能有什么不妥，就当我没说）
原因 | Reason
因为原来的背景图功能要么选一张图，要么选一个文件夹里的一组图，只有每次打开时会切换，不能自动换图，如果能够自动换图，自然会让整体更加美观，不再那么死板（就像屏保一样）
详情 | Description
No response
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First steps
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Research direction
No files, tests, or entry points are named. Start by locating the existing background-image feature, then clarify whether the intended scope is automatic folder-based image switching, MP4 support, or both; completion should include explicit behavior and supported formats.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java
- Domain
- desktop
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Quiet
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100