Make a Video Editor App with Flutter

What This App Does

A Video Editor app serves a specific need in today's mobile-first world. Building one with Flutter means you ship to iOS, Android, and the web from a single codebase, cutting development time dramatically while keeping a native-quality experience.

Main Features

Feature	Why It Matters
Timeline Editor	Drag-and-drop clips on a multi-track timeline with snap points
Trim & Split	Handle-based trimming and blade-tool splitting at the playhead position
Transitions	Cross-fade, wipe, and slide transitions between adjacent clips
Export Presets	Render to MP4, MOV, or GIF at configurable resolution and bitrate

How to Make a Video Editor App with Flutter

Timeline Editor

class TimelineTrack extends StatelessWidget {
  final List clips;
  final double scale; // pixels per second

  const TimelineTrack({super.key, required this.clips, this.scale = 40});

  @override
  Widget build(BuildContext context) {
    return SizedBox(
      height: 60,
      child: ListView.builder(
        scrollDirection: Axis.horizontal,
        itemCount: clips.length,
        itemBuilder: (ctx, i) {
          final clip = clips[i];
          return GestureDetector(
            onHorizontalDragUpdate: (d) => /* adjust position */,
            child: Container(
              width: clip.durationSeconds * scale,
              margin: const EdgeInsets.symmetric(horizontal: 2, vertical: 4),
              decoration: BoxDecoration(
                color: Colors.blue.withOpacity(0.3),
                borderRadius: BorderRadius.circular(6),
              ),
              child: Center(
                child: Text(clip.name,
                  style: const TextStyle(fontSize: 11)),
              ),
            ),
          );
        },
      ),
    );
  }
}

class VideoClip {
  final String name;
  final double durationSeconds;
  final String filePath;
  VideoClip({required this.name, required this.durationSeconds, required this.filePath});
}

Trim & Split

Future trimVideo(String inputPath, double startMs, double endMs) async {
  final outputPath = '\${dir.path}/trimmed_\${DateTime.now().millisecondsSinceEpoch}.mp4';
  final cmd = '-i $inputPath -ss $startMs -to $endMs -c copy $outputPath';
  final session = await FFmpegKit.execute(cmd);

  final returnCode = await session.getReturnCode();
  if (returnCode?.isValueSuccess() == true) {
    print('Trim successful: $outputPath');
  } else {
    print('Trim failed');
  }
}

Recommended Libraries

Package	Purpose
ffmpeg_kit_flutter	Video transcoding, trimming, and composition
video_player	Preview playback on the timeline
file_picker	Import video files from device storage

UI & UX Suggestions

Use a dark timeline (#1e1e2e), blue clip blocks, yellow playhead colour palette to match the app's purpose. Keep the navigation simple — a bottom nav bar or a single-scroll layout works best for this type of app. Make sure every interaction provides haptic or visual feedback so the app feels responsive and polished.