Absolutely! The concat demuxer is exactly what you need here—it not only fixes those annoying blank pauses you’re facing but also simplifies automated scripting way more than the concat protocol does. Let’s break down how to implement this properly:

Step 1: Generate a File List #

First, create a plain text file (let’s call it video_list.txt) that lists all the input videos you want to concatenate. Each line follows this format:

file '/path/to/your/first_video.mp4'
file '/path/to/your/second_video.mp4'
file '/path/to/your/third_video.mp4'

• If your video paths have spaces or special characters, wrapping them in single quotes ensures FFmpeg parses them correctly.
• For automation, you can generate this file with a quick script:
  • On Linux/macOS: ls /path/to/videos/*.mp4 | awk '{print "file \""$0"\""}' > video_list.txt
  • In Python: A simple loop over your video files can write each line to the text file in seconds.

Step 2: Run the FFmpeg Command #

Use this command to concatenate and encode your videos in one go:

ffmpeg -f concat -safe 0 -i video_list.txt -c:v libx264 -crf 23 -preset medium -c:a aac -b:a 128k -vf "scale=1920:1080" output_final.mp4

Let’s break down the key parameters:

• -f concat: Tells FFmpeg to use the concat demuxer instead of the protocol
• -safe 0: Allows using absolute file paths (critical for automated scripts that reference videos in different directories)
• -c:v libx264 / -crf 23: Uses the standard H.264 encoder with a balanced quality/size setting (adjust crf lower for better quality, higher for smaller files)
• -preset medium: Balances encoding speed and compression efficiency—swap to fast for quicker encodes, or slow for smaller files if you have time
• -vf "scale=1920:1080": Ensures all output is 1080p (skip this if all inputs are already 1080p to save processing time)
• -c:a aac -b:a 128k: Encodes audio to the widely supported AAC format at a standard bitrate

Why This Fixes Blank Pauses #

The concat protocol (concat:video1.mp4|video2.mp4) requires all input videos to have identical codec parameters (resolution, frame rate, bitrate, audio sample rate, etc.). Even tiny mismatches can cause sync issues or blank gaps in the final video.

The concat demuxer avoids this by re-encoding all inputs to a unified set of parameters you specify. This ensures seamless playback with no unexpected pauses, regardless of minor differences in your source files.

Pro Tips for 1080p Workflows #

• If you’re hitting performance bottlenecks during encoding, use hardware acceleration:
  • NVIDIA GPUs: Replace -c:v libx264 with -c:v h264_nvenc
  • macOS: Use -c:v h264_videotoolbox
  • Intel GPUs: Use -c:v h264_qsv
• If your source videos have varying frame rates, add -r 30 (or your desired frame rate) to the command to standardize playback.

This approach is fully scriptable, solves your pause issue, and gives you full control over the final video quality—perfect for your use case!

内容的提问来源于stack exchange，提问作者Massimo Vantaggio