The Manual Way (Premiere Pro Auto-Reframe)
Premiere Pro's Auto-Reframe effect works clip-by-clip:
- Create a 1080×1920 sequence (or right-click → Auto Reframe Sequence).
- Set motion tracking — "Slower Motion," "Default," or "Faster Motion."
- Wait for analysis — Premiere calculates keyframes for each clip's crop position.
- Review and fix — Auto-Reframe often loses subjects during fast movement. You'll manually adjust keyframes for ~30% of clips.
- Repeat for every clip. There is no batch mode. 47 clips = 47 individual reframe operations.
Time: 2–3 hours for 47 clips, plus $55/month for the Creative Cloud subscription.
The Cloud Way (OpusClip / Kapwing)
Cloud tools like OpusClip or Kapwing offer auto-reframing, but with tradeoffs:
- Upload required: 47 clips × 200MB each = 9.4GB of footage uploaded to remote servers
- Processing queue: Cloud GPU instances are shared. Your 47 clips wait behind other users
- Per-minute pricing: OpusClip charges credits per minute of processed video
- Privacy concern: Your footage sits on someone else's servers during processing
The Shortcut: Local Face-Aware Batch Crop
Onset Engine detects faces during ingest and stores face_center coordinates per clip. When you render in vertical mode, the crop window automatically follows the face position — no manual keyframing, no cloud upload:
- Batch processing: All 47 clips processed in a single pipeline run
- Three crop modes: "blur" (blurred pillarbox), "crop" (face-centered trim), or "stretch"
- Beat-synced output: Unlike plain reframers, Onset Engine also syncs your vertical clips to music
- Zero network: Processing runs on your GPU. Nothing leaves your machine
All 47 clips, one command, ~5 minutes. Face detection is computed once at ingest and cached — subsequent renders use the stored positions instantly.
When to Use Each Approach
- Premiere Auto-Reframe: When you need frame-perfect control on a single high-stakes clip (e.g., a client's keynote speech)
- Cloud tools: When you're already in the OpusClip ecosystem and your footage isn't privacy-sensitive
- Onset Engine: When you need batch processing, privacy, beat-synced output, or you simply refuse to pay $55/month to crop videos