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Regarding the issue of text-to-speech #15104

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opened 2026-02-21 19:20:12 -05:00 by yindo · 4 comments
yindo commented 2026-02-21 19:20:12 -05:00
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Originally created by @baiSu-max on GitHub (Jul 3, 2025).

Self Checks

  • This is only for bug report, if you would like to ask a question, please head to Discussions.
  • I have searched for existing issues search for existing issues, including closed ones.
  • I confirm that I am using English to submit this report (我已阅读并同意 Language Policy).
  • [FOR CHINESE USERS] 请务必使用英文提交 Issue，否则会被关闭。谢谢！:)
  • Please do not modify this template :) and fill in all the required fields.

Dify version

v1.4.0

Cloud or Self Hosted

Self Hosted (Docker)

Steps to reproduce

May I ask why my workflow sometimes returns normal audio when executing text to speech conversion in dify deployed locally with Docker, but sometimes the returned audio size is 0B?

✔️ Expected Behavior

It should be able to return the voice file normally every time

❌ Actual Behavior

Sometimes the returned audio file is normal, and sometimes the size of the returned audio file is 0, which is very illogical

Image

Image

Originally created by @baiSu-max on GitHub (Jul 3, 2025). ### Self Checks - [x] This is only for bug report, if you would like to ask a question, please head to [Discussions](https://github.com/langgenius/dify/discussions/categories/general). - [x] I have searched for existing issues [search for existing issues](https://github.com/langgenius/dify/issues), including closed ones. - [x] I confirm that I am using English to submit this report (我已阅读并同意 [Language Policy](https://github.com/langgenius/dify/issues/1542)). - [x] [FOR CHINESE USERS] 请务必使用英文提交 Issue，否则会被关闭。谢谢！:) - [x] Please do not modify this template :) and fill in all the required fields. ### Dify version v1.4.0 ### Cloud or Self Hosted Self Hosted (Docker) ### Steps to reproduce May I ask why my workflow sometimes returns normal audio when executing text to speech conversion in dify deployed locally with Docker, but sometimes the returned audio size is 0B? ### ✔️ Expected Behavior It should be able to return the voice file normally every time ### ❌ Actual Behavior Sometimes the returned audio file is normal, and sometimes the size of the returned audio file is 0, which is very illogical ![Image](https://github.com/user-attachments/assets/c08b39d1-68b9-4eb3-98db-d30b03e8d5c6) ![Image](https://github.com/user-attachments/assets/8c6d6139-2829-4946-a022-019466a01e95)
yindo added the stt & tts label 2026-02-21 19:20:12 -05:00
yindo closed this issue 2026-02-21 19:20:12 -05:00
yindo commented 2026-02-21 19:20:12 -05:00
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@dosubot[bot] commented on GitHub (Jul 3, 2025):

This issue is often caused by intermittent failures in the TTS processing pipeline—most commonly due to missing or misconfigured dependencies (especially FFmpeg), plugin daemon instability, or resource constraints in Docker. Even with FFmpeg installed, problems like plugin daemon crashes, network/API timeouts, or abrupt thread shutdowns can result in a 0B audio file, as the code may return an empty audio stream if an exception occurs during processing or if the TTS provider returns no data (source, source).

Here’s a checklist to help you troubleshoot:

  1. Confirm FFmpeg is installed inside your Docker container (not just on the host). Run ffmpeg -version inside the container to verify.
  2. Enable debug logging in Dify and check both the main app and plugin daemon logs for errors or stack traces when a 0B file is produced.
  3. Check the health and logs of the plugin daemon—restarts, crashes, or timeouts can cause empty audio responses.
  4. Monitor system resources (CPU, memory) to see if resource exhaustion coincides with failures.
  5. Confirm which TTS provider/model is configured and that it is stable and reachable from your Docker environment.
  6. If you’re using a custom or local plugin daemon, update or rebuild it—recent fixes (like chunking and streaming improvements) may resolve these issues (source).
  7. If the problem persists, collect detailed logs and your configuration to help pinpoint the failure.

Let me know if you find any specific errors in the logs or if you need help interpreting them!

To reply, just mention @dosu.

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@dosubot[bot] commented on GitHub (Jul 3, 2025): <!-- Answer --> This issue is often caused by intermittent failures in the TTS processing pipeline—most commonly due to missing or misconfigured dependencies (especially FFmpeg), plugin daemon instability, or resource constraints in Docker. Even with FFmpeg installed, problems like plugin daemon crashes, network/API timeouts, or abrupt thread shutdowns can result in a 0B audio file, as the code may return an empty audio stream if an exception occurs during processing or if the TTS provider returns no data ([source](https://github.com/langgenius/dify/issues/17912), [source](https://github.com/langgenius/dify/blob/a79f37b686ca4a487df4311f413cc90e52e7af44/api/core/base/tts/app_generator_tts_publisher.py)). Here’s a checklist to help you troubleshoot: 1. **Confirm FFmpeg is installed inside your Docker container** (not just on the host). Run `ffmpeg -version` inside the container to verify. 2. **Enable debug logging** in Dify and check both the main app and plugin daemon logs for errors or stack traces when a 0B file is produced. 3. **Check the health and logs of the plugin daemon**—restarts, crashes, or timeouts can cause empty audio responses. 4. **Monitor system resources** (CPU, memory) to see if resource exhaustion coincides with failures. 5. **Confirm which TTS provider/model is configured** and that it is stable and reachable from your Docker environment. 6. If you’re using a custom or local plugin daemon, **update or rebuild it**—recent fixes (like chunking and streaming improvements) may resolve these issues ([source](https://github.com/langgenius/dify/issues/15265)). 7. If the problem persists, **collect detailed logs and your configuration** to help pinpoint the failure. Let me know if you find any specific errors in the logs or if you need help interpreting them! <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](https://go.dosu.dev/dosubot).* --- <sup>How did I do? [Good](https://app.dosu.dev/response-feedback/4f35de1f-3d2b-4643-ab23-84dea359314b?feedback_type=great_response) | [Irrelevant](https://app.dosu.dev/response-feedback/4f35de1f-3d2b-4643-ab23-84dea359314b?feedback_type=irrelevant_answer) | [Incorrect](https://app.dosu.dev/response-feedback/4f35de1f-3d2b-4643-ab23-84dea359314b?feedback_type=incorrect_sources) | [Verbose](https://app.dosu.dev/response-feedback/4f35de1f-3d2b-4643-ab23-84dea359314b?feedback_type=too_verbose) | [Hallucination](https://app.dosu.dev/response-feedback/4f35de1f-3d2b-4643-ab23-84dea359314b?feedback_type=hallucination) | [Report 🐛](https://app.dosu.dev/response-feedback/4f35de1f-3d2b-4643-ab23-84dea359314b?feedback_type=bug_report) | [Other](https://app.dosu.dev/response-feedback/4f35de1f-3d2b-4643-ab23-84dea359314b?feedback_type=other)</sup>&nbsp;&nbsp;[![Join Discord](https://img.shields.io/badge/join-5865F2?logo=discord&logoColor=white&label=)](https://go.dosu.dev/discord-bot)&nbsp;[![Share on X](https://img.shields.io/badge/X-share-black)](https://twitter.com/intent/tweet?text=%40dosu_ai%20helped%20me%20solve%20this%20issue!&url=https%3A//github.com/langgenius/dify/issues/21893)
yindo commented 2026-02-21 19:20:12 -05:00
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@xzneozx96 commented on GitHub (Jul 3, 2025):

found another problem on all sort of Dify version (cloud, self-host, docker): when auto-play is turned on, there is always a delay in the middle of the message
example:
if the full answer is: Hi, I'm a virtual assistant. How can I help you today?
then here is how the delays go: H, I'm a virtual ......... (1-2 seconds) assistant. How can I help you today?

The weird thing is that the delay occurs mostly only ONCE in the whole message

Have u ever experienced the same?

@xzneozx96 commented on GitHub (Jul 3, 2025): found another problem on all sort of Dify version (cloud, self-host, docker): when auto-play is turned on, there is always a delay in the middle of the message example: if the full answer is: Hi, I'm a virtual assistant. How can I help you today? then here is how the delays go: H, I'm a virtual ......... (1-2 seconds) assistant. How can I help you today? The weird thing is that the delay occurs mostly only ONCE in the whole message Have u ever experienced the same?
yindo commented 2026-02-21 19:20:12 -05:00
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@crazywoola commented on GitHub (Jul 6, 2025):

found another problem on all sort of Dify version (cloud, self-host, docker): when auto-play is turned on, there is always a delay in the middle of the message example: if the full answer is: Hi, I'm a virtual assistant. How can I help you today? then here is how the delays go: H, I'm a virtual ......... (1-2 seconds) assistant. How can I help you today?

The weird thing is that the delay occurs mostly only ONCE in the whole message

Have u ever experienced the same?

Afaik, I haven't encountered this problem.

@crazywoola commented on GitHub (Jul 6, 2025): > found another problem on all sort of Dify version (cloud, self-host, docker): when auto-play is turned on, there is always a delay in the middle of the message example: if the full answer is: Hi, I'm a virtual assistant. How can I help you today? then here is how the delays go: H, I'm a virtual ......... (1-2 seconds) assistant. How can I help you today? > > The weird thing is that the delay occurs mostly only ONCE in the whole message > > Have u ever experienced the same? Afaik, I haven't encountered this problem.
yindo commented 2026-02-21 19:20:12 -05:00
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@dosubot[bot] commented on GitHub (Aug 29, 2025):

Hi, @baiSu-max. I'm Dosu, and I'm helping the Dify team manage their backlog and am marking this issue as stale.

Issue Summary:

  • You reported intermittent empty audio files from text-to-speech in Dify v1.4.0 self-hosted via Docker.
  • Possible causes discussed include missing FFmpeg in the container, plugin daemon instability, resource constraints, or TTS provider issues.
  • I provided a detailed troubleshooting checklist to help diagnose the problem.
  • Another user mentioned a separate auto-play delay issue, but no direct resolution has been found for either problem.

Next Steps:

  • Please let me know if this issue is still relevant with the latest version of Dify by commenting here.
  • If I don’t hear back within 15 days, this issue will be automatically closed.

Thanks for your understanding and contribution!

@dosubot[bot] commented on GitHub (Aug 29, 2025): Hi, @baiSu-max. I'm [Dosu](https://dosu.dev), and I'm helping the Dify team manage their backlog and am marking this issue as stale. **Issue Summary:** - You reported intermittent empty audio files from text-to-speech in Dify v1.4.0 self-hosted via Docker. - Possible causes discussed include missing FFmpeg in the container, plugin daemon instability, resource constraints, or TTS provider issues. - I provided a detailed troubleshooting checklist to help diagnose the problem. - Another user mentioned a separate auto-play delay issue, but no direct resolution has been found for either problem. **Next Steps:** - Please let me know if this issue is still relevant with the latest version of Dify by commenting here. - If I don’t hear back within 15 days, this issue will be automatically closed. Thanks for your understanding and contribution!
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