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Configure Launch Standard Worker for Flamenco 3.7 (2025-07-15 18:30Z)

User

@2025-05-12_16-04Z-technical-scripting-and-troubleshooting-discussion.md @2025-05-13_23-13Z-bypassing-password-prompts-in-script.md @2025-06-03_00-04Z-change-retry-function-to-infinite-retries.md @2025-05-14_15-49Z-cmd-worker-error-handling-and-retry-logic.md @2025-05-23_23-12Z-replace-remotecmd-with-remotesimplified.md I'm upgrading from Flamenco 3.6 to 3.7. CMD workers are working fine because they're directed to F:\software\Flamenco 3.7, and i9kf is working fine because I've installed flamenco 3.7 to that local path. Can we have Launch Standard Worker run the worker executable in F:\software\Flamenco 3.7 ?

Assistant

Yes, you can have the "Launch Standard Worker" option run the worker executable from F:\software\Flamenco 3.7 for all systems, just like the CMD workers. Currently, the Get-RemoteStandardWorkerCommand function is set up to run the worker from C:\Program Files\Blender Foundation\Flamenco 3.7 if it exists, but you want it to always use F:\software\Flamenco 3.7\flamenco-worker.exe.

Here's what you need to do:

Update the Get-RemoteStandardWorkerCommand function so that it always sets the location to F:\software\Flamenco 3.7 and runs flamenco-worker.exe from there, regardless of whether the directory exists in C:\Program Files\....

How to update:

Replace the entire worker start block in Get-RemoteStandardWorkerCommand with the following:

# Start worker
Write-Host "Starting Flamenco worker..." -ForegroundColor Cyan
Set-Location 'F:\software\Flamenco 3.7'
if (Test-Path 'flamenco-worker.exe') {
    Write-Host "Running flamenco-worker.exe..." -ForegroundColor Green
    # Run the worker and capture its exit code
    $workerProcess = Start-Process -FilePath '.\flamenco-worker.exe' -NoNewWindow -PassThru -Wait
    $exitCode = $workerProcess.ExitCode
    Write-Host "Flamenco worker process has terminated with exit code: $exitCode" -ForegroundColor Yellow
    exit $exitCode  # Exit with the worker's exit code to trigger restart if needed
} else {
    Write-Host "Error: flamenco-worker.exe not found in F:\software\Flamenco 3.7" -ForegroundColor Red
    exit 1  # Exit with error code to trigger restart
}

Remove the check for C:\Program Files\Blender Foundation\Flamenco 3.7 entirely.

Result:

All "Standard Worker" launches will use the 3.7 executable from F:\software\Flamenco 3.7, just like your CMD workers.
This will ensure consistency across all your worker launches.

Would you like me to make this edit for you now?

User

each worker except for i9kf is printing:

2025-07-15T12:36:06-06:00 WRN unable to send sign-on request error="Post "http://localhost:8888/api/v3/worker/sign-on": dial tcp [::1]:8888: connectex: No connection could be made because the target machine actively refused it." manager=http://localhost:8888/

Assistant

The warning message:

WRN unable to send sign-on request error="Post \"http://localhost:8888/api/v3/worker/sign-on\": dial tcp [::1]:8888: connectex: No connection could be made because the target machine actively refused it." manager=http://localhost:8888/

means that the Flamenco worker is trying to connect to a Flamenco Manager at http://localhost:8888/, but nothing is listening on that port on the remote machine. This is a network/configuration issue, not a script or launcher bug.

Why does this happen?

Each worker runs on its own machine.
By default, the worker tries to connect to a manager at localhost:8888 (i.e., itself).
Unless the Flamenco Manager is running on that same machine and on that port, the connection will fail.

Why does i9kf work?

On i9kf, you probably have the Flamenco Manager running locally, or the worker's config points to the correct manager address.

Why do the others fail?

On the other machines, the worker is trying to connect to localhost:8888, but the manager is not running there (or not on that port).

How to Fix

You need to make sure that each worker's configuration file (flamenco-worker.yaml) points to the correct Flamenco Manager address (the actual host/IP where the manager is running, not localhost).

Steps:

Find the manager's real address.
- If the manager is running on i9kf, use its network name or IP, e.g., http://i9kf:8888/ or http://192.168.1.100:8888/.
Update the worker config on each machine:
- Open flamenco-worker.yaml (location is shown in the worker's startup log, e.g., C:\Users\Nathan\AppData\Local\Blender Foundation\Flamenco\worker-2\flamenco-worker.yaml).
- Find the line like:
```
manager: http://localhost:8888/
```
- Change it to:
```
manager: http://i9kf:8888/
```
  or whatever the correct address is for your network.
Restart the worker after saving the config.

Why does this only affect "Standard Worker"?

It doesn't—all workers will have this problem if their config points to the wrong manager address. The difference is likely that i9kf is the manager host, so localhost works there, but not on the other machines.

TL;DR

The error is because the worker is trying to connect to a manager on localhost, but there is no manager running there.
Update the manager: line in each worker's flamenco-worker.yaml to point to the correct network address of your Flamenco Manager.
Restart the workers.

Let me know if you want a script or command to automate updating these config files across your network!

User

why does flamenco-manager.exe close immediately every time I start it?

Assistant

When flamenco-manager.exe closes immediately after you start it, it usually means one of the following:

1. Missing or Invalid Configuration

Flamenco Manager requires a valid configuration file (flamenco-manager.yaml).
If the config file is missing, malformed, or has invalid values, the manager will exit immediately (sometimes with an error message, sometimes silently if run from Explorer).

How to check:

Open a terminal (PowerShell or CMD).
Run flamenco-manager.exe from the command line, not by double-clicking.
Observe any error messages printed to the terminal.

2. Port Already in Use

If another process is already using the port (default: 8888), the manager will fail to start and exit.

How to check:

Run from terminal and look for errors about "address already in use" or similar.

3. Missing Dependencies

Flamenco Manager may require certain files or dependencies in the same directory (e.g., config, database).
If you moved only the .exe and not the supporting files, it may fail.

4. Permissions

If the user running the manager does not have permission to bind to the port or access required files, it may exit.

5. Crash or Unhandled Exception

If there is a bug or incompatibility, the manager may crash. Running from terminal will show a stack trace or error.

What to Do

Always run from a terminal (PowerShell or CMD), not by double-clicking.
This way, you can see any error output.
Check for error messages in the terminal.
Verify configuration:
- Make sure flamenco-manager.yaml exists in the expected location.
- Check for typos or invalid values.
Check for port conflicts:
- Make sure nothing else is using port 8888 (or whatever port you set).
Check logs:
- Flamenco Manager may write logs to a file or the console. Look for any log files in the same directory.

Common Fix Example

If you see an error like:

Error: failed to read configuration: open flamenco-manager.yaml: The system cannot find the file specified.

→ You need to create or copy the config file to the same directory as the .exe.

If you see:

Error: listen tcp 0.0.0.0:8888: bind: An attempt was made to access a socket in a way forbidden by its access permissions.

→ The port is in use or you lack permissions.

Summary Table

Symptom	Likely Cause	Solution
Closes instantly	Config missing/invalid	Check/create `flamenco-manager.yaml`
Error about port	Port in use	Free port or change config
No error, no window	Run from terminal	See error output
Crash/stack trace	Bug or missing dependency	Check logs, update, reinstall

If you run it from a terminal and paste the error message here, I can give you a more specific solution!

User

how to change to PATH blender?

Assistant

To make Flamenco Manager use the blender found in your system PATH (instead of a hardcoded path), you should set the value to just blender (no path, no .exe), like this:

variables:
  blender:
    values:
    - platform: linux
      value: blender
    - platform: windows
      value: blender
    - platform: darwin
      value: blender

This tells Flamenco to run blender as a command, which will use whatever Blender is found first in the system PATH on each platform.

How to do it:

Open your flamenco-manager.yaml file.
Find the variables: blender: section.
Change each value: to just blender as shown above.
Save the file.
Restart Flamenco Manager.

Note:

Make sure blender is available in the PATH on each machine where workers run.
You can check this by opening a terminal and running blender—it should launch Blender.

Let me know if you want the exact YAML block to copy-paste!

User

Opening from CLI causes it to go through the setup procedure, I want to keep my sqlite and everything.

Assistant

When you launch flamenco-manager.exe and it goes through the setup procedure, it usually means one of these is true:

It cannot find your existing configuration file (flamenco-manager.yaml).
It cannot find your existing database file (flamenco-manager.sqlite).
You are running it from a different directory than before, so it creates new files.

How Flamenco Manager Locates Its Files

By default, Flamenco Manager looks for flamenco-manager.yaml and flamenco-manager.sqlite in the current working directory (the directory you launch it from).
If it doesn't find them, it starts the setup wizard and creates new files.

How to Fix

Always launch flamenco-manager.exe from the directory where your config and database are located.

Example

If your files are in:

C:\Program Files\Blender Foundation\Flamenco 3.7\

then you should:

Open a terminal (PowerShell or CMD).

Run:

cd "C:\Program Files\Blender Foundation\Flamenco 3.7"
.\flamenco-manager.exe

This way, it will find your existing flamenco-manager.yaml and flamenco-manager.sqlite and not start the setup wizard.

Alternative: Specify Config and Database Paths

If you want to run the manager from anywhere, you can specify the config and database file locations explicitly:

.\flamenco-manager.exe --config "C:\Program Files\Blender Foundation\Flamenco 3.7\flamenco-manager.yaml" --database "C:\Program Files\Blender Foundation\Flamenco 3.7\flamenco-manager.sqlite"

Summary Table

Problem	Solution
Setup wizard appears	Run from the directory with your config and database
Want to run from anywhere	Use `--config` and `--database` command-line options
Don't want new DB/config files	Make sure the manager finds your existing files

If you follow these steps, Flamenco Manager will use your existing configuration and database, and you won't lose any data or have to reconfigure.

User

it only works when I run as admin.

Assistant

If flamenco-manager.exe only works when you run it as administrator, this is almost always due to file/folder permissions or port binding restrictions. Here’s how to diagnose and fix it:

1. File/Folder Permissions

If your config/database/log files are in a protected directory (like C:\Program Files\...), normal users may not have write access.
Running as admin works because admin can write anywhere.

Solution:
Move your Flamenco Manager files (including flamenco-manager.exe, flamenco-manager.yaml, and flamenco-manager.sqlite) to a user-writable directory, such as:

C:\Users\Nathan\Flamenco\

F:\software\Flamenco 3.7\

Then run the manager from there.

Or:
Change the permissions on the folder so your user account has full read/write access.

2. Port Binding Restrictions

By default, Flamenco Manager uses port 8888, which is not a privileged port, so this is less likely the issue.
If you changed the port to something below 1024, only admin can bind to those ports.

Solution:
Use a port above 1024 (default 8888 is fine).

3. Other Causes

If you installed Flamenco Manager as a service, it may require admin to start/stop.
Antivirus or security software may block access for non-admin users.

How to Fix (Step-by-Step)

Move all Flamenco Manager files to a folder you own (e.g., C:\Users\Nathan\Flamenco).
Open a terminal as your normal user (not admin).
Navigate to that folder:
```
cd C:\Users\Nathan\Flamenco
```
Run the manager:
```
.\flamenco-manager.exe
```
If it still fails, check for error messages about permissions or file access.

Summary Table

Symptom	Cause	Solution
Only works as admin	File/folder permissions	Move files to user folder or fix permissions
Only works as admin	Port < 1024	Use port > 1024 (default 8888 is fine)
Only works as admin	Service/antivirus	Run as user, check security software

Best Practice:
Keep all Flamenco files in a user-writable directory, and run as a normal user.
Only use C:\Program Files\... for read-only binaries, not for configs or databases.

If you want, I can give you a script to move your files and fix permissions automatically—just ask!

User

i literally just added them all to path...

Failed: exec: "blender": executable file not found in %PATH% 2025-07-15T14:19:28-06:00 Task failed by 1 worker, Manager will mark it as soft failure. 2 more failures will cause hard failure. 2025-07-15T14:19:28-06:00 task changed status active -> soft-failed 2025-07-15T14:19:28-06:00 task changed status soft-failed -> active Failed: exec: "blender": executable file not found in %PATH% 2025-07-15T14:19:28-06:00 Task failed by 1 worker, Manager will mark it as soft failure. 2 more failures will cause hard failure. 2025-07-15T14:19:28-06:00 task changed status active -> soft-failed 2025-07-15T14:19:28-06:00 task changed status soft-failed -> active Failed: exec: "blender": executable file not found in %PATH% 2025-07-15T14:19:28-06:00 Task failed by 1 worker, Manager will mark it as soft failure. 2 more failures will cause hard failure. 2025-07-15T14:19:28-06:00 task changed status active -> soft-failed 2025-07-15T14:19:28-06:00 task changed status soft-failed -> active Failed: exec: "blender": executable file not found in %PATH% 2025-07-15T14:19:28-06:00 Task failed by 1 worker, Manager will mark it as soft failure. 2 more failures will cause hard failure. 2025-07-15T14:19:28-06:00 task changed status active -> soft-failed 2025-07-15T14:19:28-06:00 task changed status soft-failed -> active Failed: exec: "blender": executable file not found in %PATH% 2025-07-15T14:19:28-06:00 Task failed by 1 worker, Manager will mark it as soft failure. 2 more failures will cause hard failure. 2025-07-15T14:19:28-06:00 task changed status active -> soft-failed 2025-07-15T14:19:28-06:00 task changed status soft-failed -> active Failed: exec: "blender": executable file not found in %PATH% 2025-07-15T14:19:28-06:00 Task failed by 1 worker, Manager will mark it as soft failure. 2 more failures will cause hard failure. 2025-07-15T14:19:28-06:00 task changed status active -> soft-failed 2025-07-15T14:19:28-06:00 task changed status soft-failed -> active Failed: exec: "blender": executable file not found in %PATH% 2025-07-15T14:19:28-06:00 Task failed by 1 worker, Manager will mark it as soft failure. 2 more failures will cause hard failure. 2025-07-15T14:19:28-06:00 task changed status active -> soft-failed 2025-07-15T14:19:28-06:00 task changed status soft-failed -> active Failed: exec: "blender": executable file not found in %PATH% 2025-07-15T14:19:28-06:00 Task failed by 1 worker, Manager will mark it as soft failure. 2 more failures will cause hard failure. 2025-07-15T14:19:28-06:00 task changed status active -> soft-failed 2025-07-15T14:19:28-06:00 task changed status soft-failed -> active Failed: exec: "blender": executable file not found in %PATH% 2025-07-15T14:19:28-06:00 Task failed by 1 worker, Manager will mark it as soft failure. 2 more failures will cause hard failure. 2025-07-15T14:19:28-06:00 task changed status active -> soft-failed 2025-07-15T14:19:28-06:00 task changed status soft-failed -> active Failed: exec: "blender": executable file not found in %PATH% 2025-07-15T14:19:28-06:00 Task failed by 1 worker, Manager will mark it as soft failure. 2 more failures will cause hard failure. 2025-07-15T14:19:28-06:00 task changed status active -> soft-failed 2025-07-15T14:19:28-06:00 task changed status soft-failed -> active Failed: exec: "blender": executable file not found in %PATH% 2025-07-15T14:19:28-06:00 Task failed by 1 worker, Manager will mark it as soft failure. 2 more failures will cause hard failure. 2025-07-15T14:19:28-06:00 task changed status active -> soft-failed 2025-07-15T14:19:28-06:00 task changed status soft-failed -> active Failed: exec: "blender": executable file not found in %PATH% 2025-07-15T14:19:28-06:00 Task failed by 1 worker, Manager will mark it as soft failure. 2 more failures will cause hard failure. 2025-07-15T14:19:28-06:00 task changed status active -> soft-failed 2025-07-15T14:19:28-06:00 task changed status soft-failed -> active Failed: exec: "blender": executable file not found in %PATH% 2025-07-15T14:19:28-06:00 Task failed by 1 worker, Manager will mark it as soft failure. 2 more failures will cause hard failure. 2025-07-15T14:19:28-06:00 task changed status active -> soft-failed 2025-07-15T14:19:28-06:00 task changed status soft-failed -> active Failed: exec: "blender": executable file not found in %PATH% 2025-07-15T14:19:28-06:00 Task failed by 1 worker, Manager will mark it as soft failure. 2 more failures will cause hard failure. 2025-07-15T14:19:28-06:00 task changed status active -> soft-failed 2025-07-15T14:19:28-06:00 task changed status soft-failed -> active Failed: exec: "blender": executable file not found in %PATH% 2025-07-15T14:19:28-06:00 Task failed by 1 worker, Manager will mark it as soft failure. 2 more failures will cause hard failure. 2025-07-15T14:19:28-06:00 task changed status active -> soft-failed 2025-07-15T14:19:28-06:00 task changed status soft-failed -> active Failed: exec: "blender": executable file not found in %PATH% 2025-07-15T14:19:28-06:00 Task failed by 1 worker, Manager will mark it as soft failure. 2 more failures will cause hard failure. 2025-07-15T14:19:28-06:00 task changed status active -> soft-failed

Assistant

This error means that when the worker tries to run blender, the executable is not found in the environment’s %PATH%. Even if you just added Blender to your user or system PATH, there are a few common reasons why it still fails:

1. PATH Not Updated for the Worker Process

If you added Blender to your PATH after starting the worker, you must restart the worker process (and sometimes the whole machine, especially if running as a service or via SSH).
If the worker is running as a service or via a scheduled task, it may not inherit your user’s PATH.

2. Blender Not in PATH for All Users/Sessions

If you added Blender to your PATH only for your user, but the worker runs as another user (e.g., SYSTEM, Administrator, or via SSH), it won’t see your user’s PATH.
Check: Open a new terminal (not one that was open before you changed PATH) and run blender. If it works, the PATH is set for that user/session.

3. Blender Not in PATH on Remote Machines

Each worker runs on its own machine. You must add Blender to the PATH on every machine where a worker runs.

4. Blender Not Actually in the PATH Directory

Double-check that the directory you added to PATH actually contains blender.exe.
Try running where blender in a terminal to confirm.

5. Session/Environment Issues

If you launch the worker from a script or via SSH, make sure the PATH is set in that environment.
Sometimes, Windows needs a full log out/log in or reboot for PATH changes to propagate everywhere.

How to Diagnose

On each worker machine, open a NEW terminal.
Run:
```
blender --version
```
- If it says "not found", PATH is not set up for that user/session.
- If it prints the Blender version, PATH is correct.
Run:
```
where blender
```
- This should print the full path to blender.exe.

How to Fix

Add Blender to the System PATH (not just user PATH) on every worker machine.
Restart the worker process (and possibly the machine).
Verify in a new terminal that blender works before starting the worker.

Quick Fix: Hardcode the Path

If you want a quick workaround, you can set the path in your flamenco-manager.yaml back to the full path for Windows:

variables:
  blender:
    values:
    - platform: windows
      value: "C:\\Program Files\\Blender Foundation\\Blender 4.4\\blender.exe"

Summary Table

Problem	Solution
PATH not updated for worker	Restart worker and/or machine
PATH set only for user	Add to System PATH, or set for all users
PATH not set on remote	Set PATH on every worker machine
Blender not in PATH dir	Double-check directory, use `where blender`
Still fails	Use full path in config as a workaround

If you follow these steps, your workers should be able to find Blender via PATH. If you want a script to set PATH on all your machines, let me know!

User

flamenco is showing only blender-boss and masterbox with no blender on path.

Assistant

Given your output, you can run blender --version successfully on blender-boss as your user, so Blender is in your PATH in your interactive shell.
However, Flamenco is still reporting that "no blender on path" for blender-boss and masterbox.

This is a classic case of PATH differences between your interactive user and the environment in which the Flamenco worker runs.

Why This Happens

When you SSH in or open a terminal, you get your user’s environment (including your PATH).
When Flamenco worker runs (especially if started as a service, via Task Scheduler, or by another user), it may have a different PATH.
If you added Blender to your PATH only for your user, or only in your current session, the worker process may not see it.

How to Diagnose

Check how the worker is started on each machine:
- Is it started by double-clicking, via a script, as a Windows service, or via Task Scheduler?
- Is it started as your user, or as SYSTEM/Administrator?
Check PATH for the worker process:
- Temporarily edit your worker’s .cmd or .ps1 launch script to add:
```
[System.Environment]::GetEnvironmentVariable("PATH") | Out-File -FilePath C:\flamenco_worker_path.txt
```
- Start the worker, then check the contents of C:\flamenco_worker_path.txt to see what PATH it actually sees.
Compare this PATH to what you see in your terminal.

How to Fix

1. Add Blender to the System PATH (for all users)

Open System Properties → Advanced → Environment Variables.
Under "System variables", find Path, click Edit, and add the folder containing blender.exe.
Click OK, then reboot the machine (or at least log out and back in).

2. Restart the Worker Process

After updating the PATH, make sure to fully stop and restart the Flamenco worker process.

3. If Using a Service or Task Scheduler

Make sure the service/task is set to run as your user (or another user that has Blender in PATH), or that the System PATH is set correctly.

4. (Optional) Hardcode the Path

As a workaround, you can set the full path to Blender in your flamenco-manager.yaml for the affected machines.

Summary Table

Problem	Solution
Blender in PATH for user only	Add to System PATH, reboot, restart worker
Worker runs as different user	Add to that user’s PATH or System PATH
Worker started as service	System PATH must include Blender
Still fails	Hardcode path in config as workaround

TL;DR:
Blender is in your PATH for your user, but not for the environment the worker runs in.
Add Blender to the System PATH, reboot, and restart the worker process.

If you want a script to print the PATH as seen by the worker, let me know!

User

oh wait, I forgot to restart their workers; the envs hadn't updated.

Assistant

Ah, that's it! 🎯

Environment variables (including PATH) are only loaded when a process starts. Since you added Blender to the PATH after the workers were already running, they were still using the old environment without Blender in it.

After restarting the workers, they should now pick up the updated PATH and be able to find blender.

What Happened:

You added Blender to PATH ✅
Workers were already running with the old PATH ❌
Workers couldn't find blender because they had the old environment
Restarting workers = they get the new PATH ✅

This is a super common gotcha with environment variables! Always remember:

Environment changes → Restart affected processes
Sometimes even need to restart the whole machine for system-wide PATH changes

Your workers should now be able to find Blender via PATH. 🚀

User

vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue. pid=30728 > ERROR (gpu.vulkan): C:\Users\blender\git\blender-v450\blender.git\source\blender\gpu\vulkan\vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory iss

Assistant

This error from Blender:

ERROR (gpu.vulkan): ...vk_index_buffer.cc:31 ensure_updated: Unable to allocate index buffer. Most likely an out of memory issue.

means that Blender’s Vulkan GPU backend is unable to allocate memory for an index buffer. This is almost always a GPU memory exhaustion problem, but can also be caused by driver or system issues.

What Causes This?

GPU out of memory: The scene or job is too large for the available VRAM.
GPU driver issues: Outdated or buggy drivers can cause allocation failures.
Vulkan backend bugs: Blender’s Vulkan backend is still relatively new and may have bugs.
System resource exhaustion: If your system is low on RAM, swap, or GPU resources, allocation can fail.
Headless/Remote/VM environments: If running on a VM or without a real GPU, Vulkan may not work properly.

How to Troubleshoot & Fix

1. Check GPU Memory Usage

Use Task Manager (Windows: Ctrl+Shift+Esc → Performance → GPU) or tools like GPU-Z to monitor VRAM usage.
If VRAM is maxed out, try a smaller scene or close other GPU-using apps.

2. Update GPU Drivers

Download and install the latest drivers from NVIDIA, AMD, or Intel (not Windows Update).

3. Try OpenGL Backend

By default, Blender 4.5+ may use Vulkan, but you can force OpenGL:
- Run Blender with:
```
blender --gpu-backend opengl
```
- Or set the environment variable:
```
set BLENDER_GPU_BACKEND=opengl
```
- This can be set in your worker launch script.

4. Check for Headless/VM Issues

If running on a VM or server without a real GPU, Vulkan may not be supported.
Try using software rendering or OpenGL.

5. Reduce Scene Complexity

If possible, simplify the scene or reduce texture sizes.

6. Increase System Swap/Pagefile

If your system RAM is low, increasing the pagefile/swap may help (though this is a last resort for GPU memory issues).

How to Set OpenGL for Flamenco Workers

Edit your worker launch script or the environment for the worker process:

For Windows PowerShell:

$env:BLENDER_GPU_BACKEND = "opengl"
blender ...

For CMD:

set BLENDER_GPU_BACKEND=opengl
blender ...

Or add this to your Flamenco worker’s .ps1 or .cmd file before launching Blender.

Summary Table

Cause	Solution
GPU out of memory	Reduce scene size, close other GPU apps
Outdated GPU drivers	Update drivers
Vulkan backend bug	Use OpenGL backend
Headless/VM environment	Use OpenGL or software rendering
System RAM low	Increase swap/pagefile

Try running Blender with the OpenGL backend and see if the error goes away. If it does, it’s a Vulkan/driver issue. If not, it’s likely a true out-of-memory problem.

Let me know if you want a ready-to-use script or config for setting the backend for all your workers!

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Configure Launch Standard Worker for Flamenco 3.7 (2025-07-15 18:30Z)

Why does this happen?

Why does i9kf work?

Why do the others fail?

How to Fix

Steps:

Why does this only affect "Standard Worker"?

TL;DR

1. Missing or Invalid Configuration

2. Port Already in Use

3. Missing Dependencies

4. Permissions

5. Crash or Unhandled Exception

What to Do

Common Fix Example

Summary Table

How Flamenco Manager Locates Its Files

How to Fix

Example

Alternative: Specify Config and Database Paths

Summary Table

1. File/Folder Permissions

2. Port Binding Restrictions

3. Other Causes

How to Fix (Step-by-Step)

Summary Table

1. PATH Not Updated for the Worker Process

2. Blender Not in PATH for All Users/Sessions

3. Blender Not in PATH on Remote Machines

4. Blender Not Actually in the PATH Directory

5. Session/Environment Issues

How to Diagnose

How to Fix

Quick Fix: Hardcode the Path

Summary Table

Why This Happens

How to Diagnose

How to Fix

1. Add Blender to the System PATH (for all users)

2. Restart the Worker Process

3. If Using a Service or Task Scheduler

4. (Optional) Hardcode the Path

Summary Table

What Happened:

What Causes This?

How to Troubleshoot & Fix

1. Check GPU Memory Usage

2. Update GPU Drivers

3. Try OpenGL Backend

4. Check for Headless/VM Issues

5. Reduce Scene Complexity

6. Increase System Swap/Pagefile

How to Set OpenGL for Flamenco Workers

Summary Table

40 KiB

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