render: Make ffmpeg an optional dependency #591
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As per commit 92db33b ffmpeg is not required anymore by VHS unless some rendering is enabled. For example we only use VHS as a testing tool and we rely on text output only, so having the whole ffmpeg installed isn't required. So do this check at rendering time instead of as a pre-requisite
2 tasks
caarlos0
reviewed
Mar 28, 2025
| @@ -16,6 +23,16 @@ type FilterComplexBuilder struct { | |||
| prevStageName string | |||
| } | |||
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| func checkFFMpegDependency() error { | |||
| haveFFMpegOnce.Do(func() { | |||
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| if err := checkFFMpegDependency(); err != nil { | ||
| return err | ||
| } |
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could move this before the for loop, then the sync.Once stuff isn't even needed.
coudl copy the if from main.go:309 there and that's it I think 🤔
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Pull Request Overview
This PR makes the ffmpeg dependency optional by deferring its check to rendering time, allowing users relying solely on text output to avoid installing ffmpeg. Key changes include:
- Adding a runtime ffmpeg dependency check in the Render method.
- Removing the global ffmpeg dependency check from ensureDependencies in main.go.
- Introducing a cached ffmpeg dependency check function in ffmpeg.go.
- Updating README.md to reflect that ffmpeg is optional if text output is used.
Reviewed Changes
Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| vhs.go | Added a runtime dependency check for ffmpeg during rendering. |
| main.go | Removed the mandatory ffmpeg dependency check at startup. |
| ffmpeg.go | Introduced a cached checkFFMpegDependency function. |
| README.md | Updated installation instructions to clarify optional use. |
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As per commit 92db33b ffmpeg is not required anymore by VHS unless some rendering is enabled.
For example we only use VHS as a testing tool and we rely on text output only, so having the whole ffmpeg installed isn't required.
So do this check at rendering time instead of as a pre-requisite