Software⏱️ 3 min read📅 2026-06-15

How to Fix: Error in multi streaming output to RTMP

FFmpeg error with multiple stream outputs to RTMP and MP4 file.

Quick Answer: Increase the thread_queue_size option to resolve the thread message queue blocking issue.

The error in multi-streaming output to RTMP occurs when attempting to create multiple streams from a single input, with one stream being sent to an RTMP server and another as an MP4 file. This issue affects users who rely on the functionality of streaming multiple outputs simultaneously.

This error is frustrating because it prevents users from achieving their desired streaming setup, which can be critical for live events or continuous content delivery. The solution involves identifying the root cause of the issue and applying a suitable fix to resolve the problem.

🛑 Root Causes of the Error

  • The primary reason for this error is the high thread message queue blocking in the FFmpeg pipeline, which occurs when the number of threads created exceeds the available system resources. This can be caused by an insufficient thread_queue_size option or a large number of concurrent processes running simultaneously.
  • An alternative cause could be the inefficient use of CPU resources, leading to excessive processing time and subsequent errors.

🔧 Proven Troubleshooting Steps

Increasing thread_queue_size

  1. Step 1: Step 1: Identify the current thread_queue_size option in the FFmpeg command. This can be done by searching for the '-thread_queue_size' flag or checking the FFmpeg documentation.
  2. Step 2: Step 2: Increase the thread_queue_size option to a higher value, such as 64 or 128, depending on the available system resources and the number of concurrent processes running simultaneously.
  3. Step 3: Step 3: Apply the updated command with the increased thread_queue_size option to resolve the error.

Optimizing CPU resource usage

  1. Step 1: Step 1: Analyze the FFmpeg pipeline to identify potential bottlenecks and areas for optimization.
  2. Step 2: Step 2: Apply optimization techniques, such as using hardware acceleration or reducing the complexity of the filter chain, to improve CPU resource efficiency.

✨ Wrapping Up

By identifying and addressing the root cause of the error, users can resolve the issue and achieve successful multi-streaming output to RTMP. Increasing thread_queue_size or optimizing CPU resource usage are effective methods for resolving this problem, ensuring reliable and efficient streaming operations.

Did this fix your problem?

If not, try searching for specific error codes.

🔍 Search Error Database

❓ Frequently Asked Questions