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Debug a filtergraph with FFmpeg graphmonitor
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What this guide covers
For editors and pipeline builders whose FFmpeg filtergraph runs slowly or stalls and who want to see which link holds queued frames. They end up with a separate statistics video to read next to the normal output. Based on the FFmpeg documentation and source; no command was run.
More about this guide
Guide ID: art_01M6W2CE0X74YWFJCQDQ538GPY
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Guide title
Debug a filtergraph with FFmpeg graphmonitor
Coverage
For editors and pipeline builders whose FFmpeg filtergraph runs slowly or stalls and who want to see which link holds queued frames. They end up with a separate statistics video to read next to the normal output. Based on the FFmpeg documentation and source; no command was run.
Example
Hypothetical and not run: a logo-overlay chain suspected of being slow is watched through a side branch, and the reader checks the stats video for a link whose queue keeps growing.
Useful starting points
- In compact mode a filter that never appears had no queued frames when sampled, so a short or empty listing is not an error.
- Every labelled output of a complex filtergraph must be mapped exactly once, or ffmpeg reports an unmapped or doubly mapped pad.
- Keep one branch of a split for the real output; the monitor discards the frames it receives, so sending your only copy there removes the picture.
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