Replace a part of a video file with another one with FFmpeg

[skepasti21]

Discussion Type

Question

Discussion Content

I've been struggling with CHATGPT(https://chatgpt.com/share/67fd6ff6-3d9c-800e-9e2f-0dbfa4c9e715) to create a script which will simply replace a part of a video clip with another to make it more clear, I have a bunch of video files, 153 video files of DRAGONBALL 1 series, and all have the same intro which I'd like to replace with another one. Any clues?

[weyniis]

Hey sounds like u want to remove the same intro from multiple episodes and replace it with a new one. Here's how u can do it using ffmpeg, step by step.

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🎯 Goal:
Replace the first few seconds (the intro) of each video with a new intro clip.

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🧪 FFmpeg Command (Example):

ffmpeg -i new_intro.mp4 -i episode1.mp4 -filter_complex "[0:v:0][0:a:0][1:v:0][1:a:0]concat=n=2:v=1:a=1[outv][outa]" -map "[outv]" -map "[outa]" output1.mp4

This takes new_intro.mp4 + episode1.mp4 (without its original intro) and joins them together.

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🛠️ To apply this to all 153 files:

1. Trim the old intro from each file (e.g., first 10 seconds).
2. Concatenate the new intro with the trimmed file.
3. Automate it with a loop.

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🧰 Bash Script (for Linux/macOS):

#!/bin/bash
for file in *.mp4; do
ffmpeg -ss 00:00:10 -i "$file" -c copy "trimmed_$file"
ffmpeg -i new_intro.mp4 -i "trimmed_$file"
-filter_complex "[0:v:0][0:a:0][1:v:0][1:a:0]concat=n=2:v=1:a=1[outv][outa]"
-map "[outv]" -map "[outa]" "final_$file"
done

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📌 Notes:

• Change 00:00:10 to match your original intro length.
• Make sure new_intro.mp4 matches the codec, resolution, and frame rate.
• Run in a folder containing only the episode files + new_intro.mp4.

Hope this helps! Let me know if u need help adjusting it for Windows or if u want a no-reencoding (fast) version.

[skepasti21]

There is No need to reencode he videos, I just want to replace the intros to all these 153 videos.

[mecodeatlas]

Thanks for posting in the GitHub Community, @skepasti21!

We're happy you're here. You are more likely to get a useful response if you are posting your question in the applicable category, the Discussions category is solely related to conversations around the GitHub product Discussions. This question should be in the Programming Help category. I've gone ahead and moved it for you. Good luck!