I have searched for any existing and/or related issues.
I have searched for any existing and/or related discussions.
I have also searched in the CLOSED issues AND CLOSED discussions and found no related items (your issue might already be addressed on the development branch!).
I am using the latest version of Open WebUI.
Installation Method
Docker
Open WebUI Version
v0.9.2
Ollama Version (if applicable)
No response
Operating System
Ubuntu 24.04
Browser (if applicable)
No response
Confirmation
I have read and followed all instructions in README.md.
I am using the latest version of both Open WebUI and Ollama.
I have included the browser console logs.
I have included the Docker container logs.
I have provided every relevant configuration, setting, and environment variable used in my setup.
I have clearly listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc).
I have documented step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation. My steps:
Start with the initial platform/version/OS and dependencies used,
Specify exact install/launch/configure commands,
List URLs visited, user input (incl. example values/emails/passwords if needed),
Describe all options and toggles enabled or changed,
Include any files or environmental changes,
Identify the expected and actual result at each stage,
Ensure any reasonably skilled user can follow and hit the same issue.
Expected Behavior
I can use the OpenAI-compatible API from OpenRouter or LiteLLM to generate speech using Gemini-TTS. PCM audio from the Text-to-Speech Engine is transcoded to MP3 for the client.
Actual Behavior
OpenRouter and LiteLLM respond with PCM and do not support any other format for Gemini-TTS. Open WebUI passes the raw PCM audio to client with MP3 content type and no audio is heard.
No errors. Browser network log shows audio/mpeg response even though the file is actually PCM.
Additional Information
I will open a PR to transcode when TTS Engine returns Content-Type audio/pcm.
Originally created by @daradib on GitHub (Apr 26, 2026).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/24143
### Check Existing Issues
- [x] I have searched for any existing and/or related issues.
- [x] I have searched for any existing and/or related discussions.
- [x] I have also searched in the CLOSED issues AND CLOSED discussions and found no related items (your issue might already be addressed on the development branch!).
- [x] I am using the latest version of Open WebUI.
### Installation Method
Docker
### Open WebUI Version
v0.9.2
### Ollama Version (if applicable)
_No response_
### Operating System
Ubuntu 24.04
### Browser (if applicable)
_No response_
### Confirmation
- [x] I have read and followed all instructions in `README.md`.
- [x] I am using the latest version of **both** Open WebUI and Ollama.
- [x] I have included the browser console logs.
- [x] I have included the Docker container logs.
- [x] I have **provided every relevant configuration, setting, and environment variable used in my setup.**
- [x] I have clearly **listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup** (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc).
- [x] I have documented **step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation**. My steps:
- Start with the initial platform/version/OS and dependencies used,
- Specify exact install/launch/configure commands,
- List URLs visited, user input (incl. example values/emails/passwords if needed),
- Describe all options and toggles enabled or changed,
- Include any files or environmental changes,
- Identify the expected and actual result at each stage,
- Ensure any reasonably skilled user can follow and hit the same issue.
### Expected Behavior
I can use the OpenAI-compatible API from OpenRouter or LiteLLM to generate speech using Gemini-TTS. PCM audio from the Text-to-Speech Engine is transcoded to MP3 for the client.
### Actual Behavior
OpenRouter and LiteLLM respond with PCM and do not support any other format for Gemini-TTS. Open WebUI passes the raw PCM audio to client with MP3 content type and no audio is heard.
### Steps to Reproduce
Configure Text-to-Speech in Admin Panel
- Text to Speech Engine: OpenAI
- API Base URL: https://openrouter.ai/api/v1
- TTS Voice: Zephyr
- Model: google/gemini-3.1-flash-tts-preview
### Logs & Screenshots
No errors. Browser network log shows audio/mpeg response even though the file is actually PCM.
### Additional Information
I will open a PR to transcode when TTS Engine returns Content-Type audio/pcm.
GiteaMirror
added the bug label 2026-05-21 02:49:43 -05:00
Looking at ff791b4 the synchronous function transcode_audio_to_mp3 is called from async speech method. It should use await asyncio.to_thread as I did in #24145.
<!-- gh-comment-id:4409298983 -->
@daradib commented on GitHub (May 8, 2026):
Looking at ff791b4 the synchronous function `transcode_audio_to_mp3` is called from async speech method. It should use `await asyncio.to_thread` as I did in #24145.
Blocking a user prevents them from interacting with repositories, such as opening or commenting on pull requests or issues. Learn more about blocking a user.
Originally created by @daradib on GitHub (Apr 26, 2026).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/24143
Check Existing Issues
Installation Method
Docker
Open WebUI Version
v0.9.2
Ollama Version (if applicable)
No response
Operating System
Ubuntu 24.04
Browser (if applicable)
No response
Confirmation
README.md.Expected Behavior
I can use the OpenAI-compatible API from OpenRouter or LiteLLM to generate speech using Gemini-TTS. PCM audio from the Text-to-Speech Engine is transcoded to MP3 for the client.
Actual Behavior
OpenRouter and LiteLLM respond with PCM and do not support any other format for Gemini-TTS. Open WebUI passes the raw PCM audio to client with MP3 content type and no audio is heard.
Steps to Reproduce
Configure Text-to-Speech in Admin Panel
Logs & Screenshots
No errors. Browser network log shows audio/mpeg response even though the file is actually PCM.
Additional Information
I will open a PR to transcode when TTS Engine returns Content-Type audio/pcm.
@tjbck commented on GitHub (May 8, 2026):
Addressed in dev.
@daradib commented on GitHub (May 8, 2026):
Looking at
ff791b4the synchronous functiontranscode_audio_to_mp3is called from async speech method. It should useawait asyncio.to_threadas I did in #24145.