obsproject / obsproject/obs-studio
OBS Studio 28 breaks keyer in Decklink Output, performance in 4K extremely poor
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- Dominant language
- C
- Stars
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- Forks
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- Avg merge
- 4d 23h
- Merged PRs (30d)
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Description
Operating System Info
macOS 12
Other OS
No response
OBS Studio Version
28.0.3
OBS Studio Version (Other)
No response
OBS Studio Log URL
https://obsproject.com/logs/Ysc4v8pJc2ksZueX
OBS Studio Crash Log URL
No response
Expected Behavior
Key and Fill on Blackmagic hardware output when Keyer is enabled
Current Behavior
On OBS 28, this no longer works. Same image (or close to the same image) is output both on key and fill channels. Reverting to OBS 27 resolves this.
Steps to Reproduce
- Install Decklink or UltraStudio
- Switch to Video Color Format: RGB in Advanced settings, per Decklink Output instructions
- Enable Decklink output with a keyer enabled
- view separate key and fill feeds; they are virtually identical.
Anything else we should know?
No response
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the issue with OBS 28.0.3, Decklink or UltraStudio hardware, RGB video color format, and an enabled keyer, then compare the key and fill feeds with OBS 27. Review the Decklink Output instructions and the linked OBS log; done means separate key and fill output works again and 4K performance is no longer extremely poor.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- c
- Domain
- audio-video-rtc
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100