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Plot per-frame metadata such as average luma with FFmpeg drawgraph
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What this guide covers
For editors and QC checkers who want to see a per-frame measurement, such as average brightness, as a graph video to spot flicker, drift or cuts. You end with a graph video of the chosen metadata key. Based on the FFmpeg manual and not run.
More about this guide
Guide ID: art_01M6WKQRQ6EZX1MWKZ4H6AF7MM
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Guide title
Plot per-frame metadata such as average luma with FFmpeg drawgraph
Coverage
For editors and QC checkers who want to see a per-frame measurement, such as average brightness, as a graph video to spot flicker, drift or cuts. You end with a graph video of the chosen metadata key. Based on the FFmpeg manual and not run.
Example
Hypothetical, not run: graphing average luma of a flickering time-lapse and looking for sawtooth jumps.
Useful starting points
- An empty graph usually means the metadata filter is not placed before the graphing step or the key name is wrong.
- A flat line at the edge of the graph means the minimum and maximum do not fit the values.
- Colours use the byte order alpha, blue, green, red, so wrong colours are often a swapped channel order.
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