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KEYBINDINGS.md

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⌨️ Keybindings Reference

Timecode Display

Key Action
t Cycle timecode display modes (Full → TC Only → Minimal → Off)
Ctrl+t Toggle countdown display

Audio Channel Routing

Key Action
Ctrl+0 Reset - Clear filters, apply intelligent downmix
Ctrl+1 to Ctrl+8 Route stereo pairs (CH1+2, CH3+4, ..., CH15+16)
Ctrl+Alt+1 to Ctrl+Alt+8 Solo channels CH1-8 (mono→stereo)
Ctrl+Alt+Shift+1-8 Solo channels CH9-16 (mono→stereo)
Ctrl+l Cycle loudness normalisation (None → EBU R128 → ATSC → Podcast)
Ctrl+i Display detailed audio information

Playback Control

Key Action
. / , Step forward/backward one frame
[ / ] Decrease/increase playback speed (0.5×, 2.0×)
Backspace Reset playback speed to 1.0×
→ / ← Seek ±1 second
↑ / ↓ Seek ±5 seconds
Shift+→ / Shift+← Seek ±10 seconds

Quality Control

Key Action
i Show file metadata (resolution, codec, framerate, audio config)
s Screenshot current frame (video only, no OSD)
S Screenshot with OSD/subtitles
Alt+↑ / Alt+↓ Zoom in/out for detail inspection
Ctrl+Arrow Keys Pan whilst zoomed
Alt+0 Reset zoom and pan
d Toggle deinterlacing
a Cycle aspect ratio override
l / L Toggle loop / Set A-B loop points

Help & Information

Key Action
F1 Display broadcast-specific quick reference
? Show all keybindings

📖 Usage Examples

Scenario 1: Multi-Channel Embedded Audio QC

You receive a 1080p59.94 file with 16 channels of embedded PCM audio:

mpv broadcast_master.mxf

Workflow:

  1. Press Ctrl+i to verify 16 channels detected
  2. Press Ctrl+1 to monitor CH1+2 (typically programme L+R)
  3. Press Ctrl+3 to check CH5+6 (often ambient or effects)
  4. Press Ctrl+Alt+1 to solo CH1 (hear left channel only in both ears)
  5. Press Ctrl+0 to reset and hear all channels intelligently mixed
  6. Press Ctrl+l repeatedly until "EBU R128 (-23 LUFS)" appears for loudness normalisation

Scenario 2: Frame-Accurate Review

You need to verify a specific frame for quality control:

mpv interview_cut.mp4

Workflow:

  1. Use arrow keys for rough positioning
  2. Press , and . to step frame-by-frame
  3. Observe large timecode showing exact position: 01:23:45:18
  4. Press s to capture PNG screenshot
  5. Press Alt+↑ to zoom for pixel-peeping
  6. Use Ctrl+Arrow Keys to pan around zoomed area
  7. Press Alt+0 to reset zoom when finished

Scenario 3: Live Stream Monitoring

Monitoring a live ingest or stream:

mpv udp://239.1.1.1:5000

Workflow:

  1. Timecode automatically displays elapsed time with countdown
  2. Press # to cycle between multiple embedded audio tracks
  3. Use Ctrl+1-8 for rapid channel selection
  4. Press [ for half-speed review of recorded segments
  5. Press L twice to set A-B loop on interesting sections