Displaying video files on an LED display typically involves several core steps: content production, signal processing, hardware transmission, and control.
The following are the specific steps and precautions:
I. Preparation
Confirm the LED display parameters.
Resolution (e.g., the resolution of a P2.5 display is width × height pixels).
Interface type (HDMI/DVI/SDI/DP/fiber optic, etc.).
Refresh rate (usually ≥3840Hz to avoid flicker).
Color depth (8-bit/10-bit/12-bit).
Prepare the video source.
Format: MP4/AVI/MOV, or other common formats. H.264/H.265 encoding is preferred to reduce bandwidth usage.
Resolution: Must match the native resolution of the LED display (e.g., a 1920×1080 display must output the same resolution).
Frame rate: 25/30/50/60 fps is recommended, synchronized with the playback device.
Color space: sRGB or Rec.709 (for conventional displays), or DCI-P3 (for cinema-grade displays).
II. Hardware Connection
Sender Card
Converts the video signal from the computer/player into a format recognizable by the LED screen.
Connection Method:
Computer → Sender Card (via HDMI/DVI)
Sender Card → Receive Card (via Ethernet/fiber)
Receive Card → LED Module (via ribbon cable)
Asynchronous Playback System (Optional)
Use a USB flash drive/SD card/4G module to store videos and play them directly through the control card without the need for a computer connection.
III. Software Setup
LED control software (such as Ledshow or NovaLCT)
Steps:
Import the video file, and the software will automatically transcode it into a format supported by the LED screen (such as .led or a custom binary format).
Set the playback area (full screen/split screen/windowed).
Adjust parameters: brightness, contrast, and gamma (usually γ = 2.2-2.5).
Synchronous Calibration: Ensure that the video frame rate is an integer multiple of the LED refresh rate (e.g., for a 60fps video with a 3840Hz refresh rate, set the frequency division by 64). Professional video processor (such as the Kramer VP-794)
For advanced features such as multi-source switching, picture-in-picture, and zoom.
IV. Troubleshooting
Distortion/Stuttering
Check that the video resolution matches the LED screen.
Reduce the video bitrate (e.g., from 8Mbps to 4Mbps).
Use a high-quality network cable (Category 6 or higher) or fiber optic transmission.
Color Deviation
Enable color correction in the control software (requires the assistance of a professional colorimeter).
Adjust the RGB color gain values (typically R:G:B = 1:1.05:0.95 to compensate for LED attenuation).
Sync Delay
Enable the Genlock function to synchronize the video source with the LED refresh rate.
Reduce the number of intermediate devices (e.g., connect the sending card directly from a computer to avoid a switch).
V. Advanced Optimization
HDR Support: If the LED screen supports HDR10/Dolby Vision, enable HDR mode in the control software and ensure that the video source is in HDR format. 3D display: Requires active 3D glasses and a video source (frame sequential format) that alternates between left and right eyes.
Interactive control: Motion-sensing interaction is achieved through devices such as Kinect/Leap Motion, requiring custom software development.
Sample process:
Use Premiere to export a 1920×1080@60fps MP4 video.
Import the video using Ledshow software, setting the playback area to full screen.
Connect the sending and receiving cards with a Cat6 network cable and adjust the brightness to 80%.
Perform a test playback to ensure there are no lags before using the video.
For more specific guidance, please provide the LED screen model (e.g., P3/P4) and the video source device (e.g., computer/player model).