diff --git a/.specstory/.gitignore b/.specstory/.gitignore index 53b537f..d05a40e 100644 --- a/.specstory/.gitignore +++ b/.specstory/.gitignore @@ -1,2 +1,4 @@ # SpecStory explanation file /.what-is-this.md +# SpecStory project identity file +/.project.json diff --git a/.specstory/history/2025-11-01_15-48Z-png-rendering-error-troubleshooting.md b/.specstory/history/2025-11-01_15-48Z-png-rendering-error-troubleshooting.md new file mode 100644 index 0000000..18d185d --- /dev/null +++ b/.specstory/history/2025-11-01_15-48Z-png-rendering-error-troubleshooting.md @@ -0,0 +1,169 @@ + + + + +# PNG rendering error troubleshooting (2025-11-01 15:48Z) + +_**User (2025-11-01 15:48Z)**_ + +why is this happening to render + + + +libpng error: IDAT: CRC error + +ImageInput::read_image() failed: PNG read error: IDAT: CRC error + +PNG library error + +IMB_load_image_from_memory: unknown file-format (R:\Creative\artsy\maya\2025-02 BondingArtifact\Renders\3_background\2025-10-26\3_background_dark\3_background_dark_5489.png) + +--- + +_**Assistant (default)**_ + + + +--- + + +Reviewing the open file to understand the render configuration and identify why PNGs are being corrupted. + + +--- + +Tool use: **read_file** + +Read file: c:\Program Files\Blender Foundation\Flamenco 3.7\scripts\TalkingHeads cycles_optix_gpu_NOBAT.js + +--- + +Tool use: **codebase_search** + +
+ Searched codebase "How are PNG images saved or written during rendering?" • **3** results + +| File | Lines | +|------|-------| +| `.gitignore` | L134 | +| `.gitattributes` | L47 | +| `misc/checklist.txt` | L52 | + +
+ +--- + + + +--- + +Checking the render configuration and the corrupt file path for clues. + + +--- + +Tool use: **codebase_search** + +
+ Searched codebase "Where are render output files written or saved?" • **10** results + +| File | Lines | +|------|-------| +| `.gitignore` | L134 | +| `assets/Objects/gems/tx/BlackOnyx/Designer/BlackOnyx.sbs` | L3573-3642 | +| `misc/checklist.txt` | L52 | +| `misc/metadata.bat` | L23 | +| `misc/filenames.bat` | L1 | +| `.cursorindexingignore` | L3 | +| `.gitattributes` | L47 | +| `assets/Objects/gems/tx/BlackOnyx/Designer/BlackOnyx.sbs` | L1475-1533 | +| `misc/BRANDING.txt` | L2 | +| `assets/Objects/gems/tx/BlackOnyx/Designer/BlackOnyx.sbs` | L1976-2034 | + +
+ +--- + +Tool use: **grep** + +
+Grep for "3_background" • 0 matches + +Output mode: content + + +_No matches found_ + +
+ +--- + + + +--- + +This PNG CRC error indicates the file was corrupted during render. The path `R:\...` suggests a network drive, which is a common source. + +Common causes: +- Network storage issues: timeouts, interruptions, or bad connections corrupt writes +- Concurrent access: another process (comp, preview, antivirus) reading while a worker writes +- Incomplete writes: file read before the write finishes +- Antivirus/backup: scanning or copying files while they’re being written + +Checking the render script for timing or synchronization issues: + + +--- + +Tool use: **read_file** + +Read file: c:\Program Files\Blender Foundation\Flamenco 3.7\scripts\TalkingHeads cycles_optix_gpu_NOBAT.js + +--- + + + +--- + +## Solutions to fix this: + +### **Immediate fixes:** + +1. **Check if the file is actually corrupted** + - Verify frame `5489` on the R: drive + - If corrupted, re-render just that frame + +2. **Render to local storage first, then copy** + - Change the render output to a local drive (C: or D:) + - After rendering completes, copy to the network drive + - Reduces corruption risk from network interruptions + +3. **Increase chunk_size** + - In your Flamenco job settings, increase `chunk_size` (currently defaults to 1) + - Fewer concurrent writes = less contention + +4. **Temporarily disable antivirus/backup scanning** + - Exclude the render output folder from real-time scanning + - Network drives are often scanned aggressively + +### **Network storage specific:** + +5. **Check network drive health** + - Test the R: drive connection stability + - Run `chkdsk R: /f` if it's accessible + - Check for network timeouts or packet loss + +6. **Add file write delay/sync** + - If possible, configure Blender to flush writes completely before finishing + - Use `--python-expr` to add a small delay after rendering completes + +### **For the current corrupted frame:** + +The file `3_background_dark_5489.png` is corrupted. 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