Codeman/.agents/skills/remotion-best-practices/rules/ffmpeg.md

name, description, metadata

name	description	metadata
ffmpeg	Using FFmpeg and FFprobe in Remotion	tags ffmpeg, ffprobe, video, trimming

FFmpeg in Remotion

ffmpeg and ffprobe do not need to be installed. They are available via the bunx remotion ffmpeg and bunx remotion ffprobe:

bunx remotion ffmpeg -i input.mp4 output.mp3
bunx remotion ffprobe input.mp4

Trimming videos

You have 2 options for trimming videos:

1. Use the FFMpeg command line. You MUST re-encode the video to avoid frozen frames at the start of the video.

# Re-encodes from the exact frame
bunx remotion ffmpeg -ss 00:00:05 -i public/input.mp4 -to 00:00:10 -c:v libx264 -c:a aac public/output.mp4

2. Use the trimBefore and trimAfter props of the <Video> component. The benefit is that this is non-destructive and you can change the trim at any time.

import { Video } from "@remotion/media";

<Video
  src={staticFile("video.mp4")}
  trimBefore={5 * fps}
  trimAfter={10 * fps}
/>;