FFmpeg for Animators: 5 Key Commands | QuantumSketch
The 5 FFmpeg commands animators actually need: convert to GIF, trim, concatenate clips, add audio, and compress. Copy-paste recipes with explanations.
The five FFmpeg commands animators actually need: convert to GIF, trim, concatenate clips, add audio, and compress. FFmpeg is the free tool that turns rendered frames into shareable files — and the same one Manim uses under the hood.
1. MP4 → clean GIF (two-pass palette)
ffmpeg -i in.mp4 -vf "fps=15,scale=640:-1,palettegen" palette.png
ffmpeg -i in.mp4 -i palette.png -lavfi "fps=15,scale=640:-1,paletteuse" out.gif
The palette pass avoids the banded, ugly GIF a naive one-liner produces.
2. Trim a clip
ffmpeg -i in.mp4 -ss 00:00:03 -to 00:00:08 -c copy out.mp4
-c copy cuts without re-encoding — instant, lossless.
3. Concatenate clips
# files.txt: file 'a.mp4' / file 'b.mp4'
ffmpeg -f concat -safe 0 -i files.txt -c copy out.mp4
How a series of Manim chunks become one video.
4. Add an audio track
ffmpeg -i video.mp4 -i narration.mp3 -c:v copy -c:a aac -shortest out.mp4
This is the narration merge step, by hand.
5. Compress for the web
ffmpeg -i in.mp4 -vcodec libx264 -crf 23 out.mp4
-crf 18–28: lower = better quality + bigger file. 23 is a good default.
Quick reference
| Task | Flag |
|---|---|
| No re-encode | -c copy |
| Trim | -ss / -to |
| Quality | -crf |
| Resize | -vf scale=W:-1 |
Skip FFmpeg entirely
QuantumSketch runs FFmpeg for you — prompt in, finished MP4 out. Installing locally? See ffmpeg not found.
Written by Shihab Shahriar Antor · Shahriar Labs
FAQ
Q.What is FFmpeg and why do animators use it?
FFmpeg is a free, open-source command-line tool for converting, editing, and encoding audio and video. Animators use it because tools like Manim render raw frames or video chunks that need to be turned into a final file — encoded to MP4, converted to GIF for the web, trimmed, joined together, or have audio added. FFmpeg does all of this in a single command without opening a heavyweight editor, which makes it ideal for scripted, repeatable pipelines. It's the same tool that runs under the hood when Manim produces its output video.
Q.How do I convert a video to a GIF with FFmpeg without it looking bad?
Generate a color palette first, then use it. A naive ffmpeg -i in.mp4 out.gif produces a small, banded GIF because GIF supports only 256 colors chosen poorly. The two-pass method — ffmpeg -i in.mp4 -vf palettegen palette.png, then ffmpeg -i in.mp4 -i palette.png -lavfi paletteuse out.gif — builds an optimal palette from the actual video and gives a much cleaner result. You can also scale down with -vf scale=640:-1 and cap the frame rate with fps=15 to keep the file size reasonable for web use.