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Measure compression blockiness with FFmpeg blockdetect
Revision 2
- Inspection
- source inspected
- Execution
- not run
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- unreviewed
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What this guide covers
For editors, encoders and QC reviewers who want to compare how blocky two encodes of one source are. They end up with a per-frame score and a clip mean without changing the video. Based on FFmpeg documentation and source; no command was run and the manual gives no scale for good or bad.
More about this guide
Guide ID: art_01M6W4CNWJ5GTZ0QZGPMAHPWVR
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
Measure compression blockiness with FFmpeg blockdetect
Coverage
For editors, encoders and QC reviewers who want to compare how blocky two encodes of one source are. They end up with a per-frame score and a clip mean without changing the video. Based on FFmpeg documentation and source; no command was run and the manual gives no scale for good or bad.
Example
Hypothetical and not run: encode one source at two bitrates, measure both with identical settings, then compare the end-of-run means and inspect the worst frames of the weaker encode.
Useful starting points
- Use identical filter settings and the same FFmpeg build on every clip you compare.
- The filter gives no threshold, so look at the highest-scoring frames by eye before trusting a number.
- Compare clips from the same source at the same resolution and frame rate, or the scores are not comparable.
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