Testing video playback

This page covers how to use the Video Playback Template project to test your server’s video playback capabilities. It also tests for any underlying hardware issues that might happen under heavy load.

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VideoPlaybackTemplate.la

Test Setup Example

• 4 x 4K Outputs connected to GPU

  • 1 x 4K Output for GUI

  • 3 x 4K Outputs in Mosaic → 11520×2160

• Output refresh rate:

  • 60Hz for 30/60 fps videos

  • 50Hz for 25/50 fps videos

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Preparation

1. Install required tools:

   • LightAct 4.11.0-89 or newer

   • Advanced Renamer

   • MediaInfo

2. Setup Mosaic (if using GUI + multiple outputs)

3. Prepare Test Videos:

   • Format: HAP (number of chunks = number of CPU cores), NotchLC (Best quality)

   • Resolutions & framerates to match wanted test parameters

   • Constant bitrate

   • Duplicate and rename video files using Advanced Renamer to: VideoFileName_1, VideoFileName_2, ...

4. Close all unnecessary apps

   • No software running except LightAct

   • Close NVIDIA Control Panel after setting everything up

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Overview of the project

General

• Close all LightAct windows except Performance

• GUI (the main LightAct window) should run in Fullscreen Mode. Press F11 to toggle.

How the Project Works

• When the project opens, we wait for thumbnails to load

• Then, every 1–2 seconds, a new Play video node starts playing a new video.

• Each Play video node is playing a unique video file.

Project Structure

Layers:

1. Loading thumbnails layer waits for thumbnails to load

2. Video layer plays videos one by one (delay adjustable)

Markers:

• Marker 1: Start of test → logs "Test started"

• Marker 2: End of test → logs "Test concluded"

Output Behavior:

• Output enabled

• Traveling Lines override for smoothness monitoring

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How to Set It Up

1. In Loading thumbnails layer, adjust Delay (if more time needed to load thumbnails)

2. In Video layer, adjust Delay (if needed)

3. Import videos & assign each one to a different Play video node:

   • Select Video layer → Properties window → Set each video variable to a separate file

   

   (Assigning videos to exposed variables of Play video nodes)
4. Optimize Workspace by keeping only essential windows open (Performance, Timeline editor). Each window uses resources, that's why we want to keep it minimal.

(Optimized workspace)

1. In Performance window scroll down and you'll see the status of every Play video node.

2. Save and reopen the project. When the test starts, in Performance window monitor Missed frames and also watch the output monitor for stuttering.

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Interpreting Results

The max ammount of videos you can play is when:

• No continuous missed frames during playback (initial missed frames are okay for this test)

• Traveling Lines override plays smoothly without stuttering