Software⏱️ 4 min read📅 2026-06-19

How to Fix: ffmpeg: av_interleaved_write_frame(): Protocol error

FFmpeg error with protocol error and file size limit, fix by using a larger output file or adjusting the -f concat option.

Quick Answer: Use a larger output file or adjust the -f concat option to avoid file size limits.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🔧 Proven Troubleshooting Steps
  3. 🎯 Final Words

The 'av_interleaved_write_frame(): Protocol error' issue is encountered when attempting to merge multiple MP4 files using ffmpeg. This problem affects users who have upgraded their ffmpeg version and are now experiencing compatibility issues.

This error can be frustrating, especially for those who rely on ffmpeg for video editing and processing tasks. However, by following the steps outlined in this guide, you should be able to resolve the issue and successfully merge your MP4 files.

💡 Why You Are Getting This Error

  • The primary cause of this error is the mismatch between the input format and the output format. In this case, the input files are MP4s with a 4GB file size limit imposed by the FAT32 filesystem, while the expected output format is MOV/MP4 with no file size limits.
  • Another possible reason for this error is the use of an outdated or incompatible codec configuration in ffmpeg. This can lead to issues when attempting to write the output trailer.

🔧 Proven Troubleshooting Steps

Increasing the Output File Size Limit

  1. Step 1: To resolve this issue, you need to increase the output file size limit by modifying the -f option in your ffmpeg command. Add the '-f:mp4' option to specify that the output file should be a standard MP4 without any file size limits.
  2. Step 2: Modify the existing command as follows: `ffmpeg -f concat -safe 0 -i <(for f in *.MP4; do echo 'file '$PWD/$f'; done) -c copy -f mp4 output.mp4`. This will allow ffmpeg to write the output trailer without hitting the file size limit.
  3. Step 3: Alternatively, you can also increase the maximum file size limit on the FAT32 filesystem by modifying the registry settings or using a third-party tool. However, this method may require more advanced technical knowledge and is not recommended for beginners.

Using a Different Output Format

  1. Step 1: Another solution to this issue is to use a different output format that does not have file size limits, such as MOV or AVI. You can modify the existing command to use one of these formats by adding the '-f:mov' or '-f:avi' option.
  2. Step 2: For example, you can modify the existing command as follows: `ffmpeg -f concat -safe 0 -i <(for f in *.MP4; do echo 'file '$PWD/$f'; done) -c copy -f mov output.mov`. This will allow ffmpeg to write the output trailer without hitting the file size limit.

🎯 Final Words

In conclusion, the 'av_interleaved_write_frame(): Protocol error' issue can be resolved by either increasing the output file size limit or using a different output format that does not have file size limits. By following the steps outlined in this guide, you should be able to successfully merge your MP4 files and avoid this error.

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