QuickRender freezes with mp4/no-overwrite

Using Quick render with mp4 and choosing not to overwrite existing files (but keeping “Auto Versioning” enabled), will cause unreal to freeze up when it reaches frame 2 or 3. If I do the same with jpg output there is no freeze up - unreal will always version up the files (even with overwrite enabled). Ideally mp4 would not freeze up and instead give the same behaviour as with jpg output. This is not a high priorty request at this point.

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Steps to Reproduce
This is reproducible in 5.6 and 5.7

  • Duplicate DefaultQuickRenderGraph
  • Change output type from jpg to mp4
  • On the mp4 node, insert a {version} token to filename
  • On the Global Output Settings node, change “Overwrite Existing Output” to false
  • Render
  • Notice render will freeze at frame 2-3
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Yep you found a bug. We’ll get it fixed. Thanks for reporting it!

This has been fixed and will go into the next 5.7 hotfix.

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Cool thanks Shaun

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