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2025-02-BondingArtifact/.specstory/history/2025-10-09_18-12Z-encode-large-image-sequence-with-ffmpeg.md

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<!-- Generated by SpecStory -->
<!-- cursor Session c94f4a58-8269-4d9c-960c-470f5a0bd4c7 (2025-10-09 18:12Z) -->
# Encode large image sequence with ffmpeg (2025-10-09 18:12Z)
_**User (2025-10-29 04:20Z)**_
losslessly encode the freakishly large image sequence in D:\2025-02 BondingArtifact\Renders\3_background\2025-10-26\3_background_dark to E:\3_background_dark using ffmpeg, nvidia nvenc with CQ=0. 60fps.
---
_**Assistant (default)**_
---
Checking the source image sequence to identify the format and frame range.
---
Tool use: **list_dir**
<details>
<summary>Listed directory undefined • **0** results</summary>
No results found
</details>
---
---
Tool use: **run_terminal_cmd**
```bash
dir "D:\2025-02 BondingArtifact\Renders\3_background\2025-10-26\3_background_dark" | Select-Object -First 5
```
```
Directory: D:\2025-02 BondingArtifact\Renders\3_background\2025-10-26\3_background_dark
Mode LastWriteTime Length Name
---- ------------- ------ ----
-a--- 10/26/2025 2:33 PM 49803735 3_background_dark_0000.png
-a--- 10/26/2025 12:17 PM 49803388 3_background_dark_0001.png
-a--- 10/26/2025 1:19 PM 49799657 3_background_dark_0002.png
-a--- 10/26/2025 9:56 AM 49800635 3_background_dark_0003.png
-a--- 10/26/2025 1:39 PM 49806719 3_background_dark_0004.png
```
---
---
Tool use: **run_terminal_cmd**
```bash
dir "D:\2025-02 BondingArtifact\Renders\3_background\2025-10-26\3_background_dark" | Select-Object -Last 5
```
```
Directory: D:\2025-02 BondingArtifact\Renders\3_background\2025-10-26\3_background_dark
Mode LastWriteTime Length Name
---- ------------- ------ ----
----- 10/27/2025 12:37 AM 49805765 3_background_dark_9995.png
----- 10/26/2025 11:21 PM 49805316 3_background_dark_9996.png
----- 10/26/2025 9:46 PM 49808654 3_background_dark_9997.png
----- 10/27/2025 12:13 AM 49806734 3_background_dark_9998.png
----- 10/26/2025 11:34 PM 49805629 3_background_dark_9999.png
```
---
---
Image sequence goes from `0000` to `9999` (10,000 frames); each frame is ~50MB.
---
Tool use: **create_plan**
---
_**User (2025-10-29 04:20Z)**_
No. There are 14,401 frames. I want nvenc hevc in an mp4 container. Is the preset slow, or is it 7? I forget what the exact arguments are.
---
_**Assistant (default)**_
---
Verifying the exact frame range and NVENC preset syntax. Updating the plan.
---
Tool use: **run_terminal_cmd**
```bash
Get-ChildItem "D:\2025-02 BondingArtifact\Renders\3_background\2025-10-26\3_background_dark\*.png" | Measure-Object | Select-Object -ExpandProperty Count
```
```
14401
```
---
---
Tool use: **run_terminal_cmd**
```bash
$frames = Get-ChildItem "D:\2025-02 BondingArtifact\Renders\3_background\2025-10-26\3_background_dark\*.png"; Write-Host "First: $($frames[0].BaseName)"; Write-Host "Last: $($frames[-1].BaseName)"
```
```
First: 3_background_dark_0000
Last: 3_background_dark_9999
```
---
---
Tool use: **run_terminal_cmd**
```bash
$frames = Get-ChildItem "D:\2025-02 BondingArtifact\Renders\3_background\2025-10-26\3_background_dark\*.png" | Sort-Object Name; Write-Host "Start: $($frames[0].Name)"; Write-Host "End: $($frames[-1].Name)"; Write-Host "Total count: $($frames.Count)"
```
```
Start: 3_background_dark_0000.png
End: 3_background_dark_9999.png
Total count: 14401
```
---
_**User (2025-10-29 04:20Z)**_
you might as well do all 14401 frames.
---
_**Assistant (default)**_
---
Checking ffmpeg NVENC HEVC preset syntax. Updating the plan to use the full 14,401 frames in an MP4 container.
---
Received invalid string to replace in plan
---
---
Tool use: **create_plan**
---
_**User (2025-10-29 04:20Z)**_
No, process all 14401 frames.
---
_**Assistant (default)**_
---
Command uses `%04d.png` which only captures frames 00009999, missing the rest. Checking for five-digit frame numbers.
---
Tool use: **run_terminal_cmd**
```bash
Get-ChildItem "D:\2025-02 BondingArtifact\Renders\3_background\2025-10-26\3_background_dark\*.png" | Where-Object { $_.Name -match '_\d{5}\.' } | Select-Object Name -First 10
```
```
```
---
---
Tool use: **run_terminal_cmd**
```bash
$frames = Get-ChildItem "D:\2025-02 BondingArtifact\Renders\3_background\2025-10-26\3_background_dark\*.png" | Sort-Object Name; Write-Host "Unique count: $($frames | Select-Object -ExpandProperty BaseName -Unique | Measure-Object | Select-Object -ExpandProperty Count)"
```
---
---