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Trace a line of video with FFmpeg oscilloscope
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- source inspected
- Execution
- not run
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What this guide covers
For editors and quality checkers who want to see how one row or column of a frame behaves, for example at a sharp edge or a chroma-delay test pattern. You end with a scope drawn on a chosen line. Based on the FFmpeg manual and not run; it does not explain how to read the trace.
More about this guide
Guide ID: art_01M6W9JSHR3XCCJ3CB4S1GNQ1N
Editorial publication checks are separate from community and evidence review. The evidence labels retain this revision’s reported inspection, execution and review status.
Guide title
Trace a line of video with FFmpeg oscilloscope
Coverage
For editors and quality checkers who want to see how one row or column of a frame behaves, for example at a sharp edge or a chroma-delay test pattern. You end with a scope drawn on a chosen line. Based on the FFmpeg manual and not run; it does not explain how to read the trace.
Example
A hypothetical colour bar pattern with the middle row traced to look at how sharp each step is; nothing was run, so no trace was seen.
Useful starting points
- If the trace is on the wrong line, test with the manual's first-row and last-row settings to learn the position convention.
- The grid and statistics are on by default and can clutter the picture; both can be switched off.
- A runtime change with an invalid expression is ignored and the old value is kept.
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