Video PlaybackDual-screen ComparisonImage ViewingTrim & ExportFree
Product Intro
Want to see exactly where a student's move differs from the standard demo? Put the two videos side by side, play them slowly, and every tiny detail comes into focus. Totally free - no login, no membership, install and go. With just a coach's eye, the problem is clear at a glance and teaching gains direction instantly.
Feature scope: AI action recognition, ruler & guides and other advanced features are membership features of the Universal Edition and not included in the Free Edition
Features · Illustrated Guide
Clear interface, zero learning cost
Free Edition main window: the video freezes at the athlete's takeoff moment, with the control panel on the right and the playback bar at the bottom
Video area: shows the current frame; the window can be freely resized
Playback bar: play/pause, progress bar, speed control, and frame / duration display
Right control panel: three groups - window mode, trim video, video transform
The Free Edition needs no login and no membership - just install and use. It excels at dual-video side-by-side comparison: with synchronized screens, slow motion and moment-by-moment replay, coaches see the differences with their own eyes - no AI recognition or skeleton display. Each core feature is detailed below; click any feature above to jump to its description.
① Single / Dual Window: one window for one video, two windows for comparison
The "Window Mode" group on the right: switch between A window / B window / AB window in one click
One window, one video: a single video fills one window - larger and more focused
Two windows, comparison: two videos side by side in sync to compare differences
Three modes: switch between A window / B window / AB window in one click
② Dual-video Sync Control: two videos perfectly aligned
AB dual-window mode: two videos synchronized side by side, frozen at the same airborne moment for moment-by-moment comparison
1
Enter dual-video: click "AB Window" on the right to split the window into two display areas.
2
Load two videos: click "Upload Video A / Upload Video B" in each area, e.g. student action vs standard demo.
3
Sync playback: tick "Play Together" at the bottom; both stay frame-synced, and dragging one seeks the other.
③ Moment-by-moment Inspection: miss no instant
Playback bar: progress bar plus rewind / previous frame / play / next frame / forward - see every instant frame by frame
Frame stepping: use "Previous / Next Frame" to inspect action details frame by frame
Rewind / forward: jump several frames at once to locate key moves quickly
Frame & time: shows the current frame number and elapsed time in real time
④ Variable Speed Playback: tune the speed as you like
Playback speed dropdown: six options - slow 20 / 10 / 5 / 2, normal, and fast 2x
Six speed levels: slow 20 / 10 / 5 / 2, normal, fast 2x
Slow it down: slow the power process to see key details clearly
Switch anytime: adjust speed during playback without losing your position
⑤ Video Player: smooth multi-format playback
Video player: open a clip and play it back smoothly, with slow motion and frame-by-frame replay
Many formats: MP4 / AVI / MOV and more open and play directly
Speed control: slow motion and frame-by-frame replay to see key movements clearly
Position control: drag the progress bar or step frames to locate any instant quickly
⑥ Image Viewer: freeze a single frame for a clear look
Image viewer: import JPG / PNG / BMP images directly, freeze a frame and zoom in
Direct viewing: import and view JPG / PNG / BMP images directly
Frame freeze: bring in a key-action screenshot and zoom in on the details
Video / image comparison: pair with the video window to compare an image and a video side by side
⑦ Clip Trimming: extract key action clips
The "Trim Video" group: pick a video source, set start/end frames, then trim and export
1
Set start frame: play to the start position, then click "Set Start Frame".
2
Set end frame: play to the end position, then click "Set End Frame".
3
Confirm trim: click "Confirm Trim" and pick a save path to export the clip of that range.
Trimming extracts key action clips (such as a clean airborne takeoff) so they can be kept, shared with students, or compared again.
⑧ Picture Adjustment: rotate and mirror to straighten the view
The "Video Transform" group: rotation angle and horizontal / vertical mirror toggles
Rotation: rotate 0 / 90 / 180 / 270° to straighten any shooting angle
Horizontal mirror: flip left/right in one click to compare symmetrical moves from the same direction
Source untouched: only the display changes; the original video stays the same
⑨ Comparison Range: independent ranges for A and B
The "Trim Video" group lets you set separate start/end frames for Video A and Video B
1
Pick a source: choose Video A or Video B in the "Video Source" dropdown.
2
Set ranges separately: give A and B their own start/end ranges - flexible and independent.
3
Load the range: click "Load Trimmed Video in One Click" to load the chosen range and focus on the key clip.
⑩ Interface Skins: four themes to switch freely
Dark theme: easier on the eyes and more focused at night or on a projector
Four skins: default blue, dark black, vivid orange, fresh green
Instant effect: switch in one click via the "Settings → Skin" menu
Auto-remembered: saved automatically and reused on next launch
Want a fuller illustrated guide? Click "View Online Manual" on the right to read chapter-by-chapter instructions.
Your videos never leave this computer. Videos and images are processed entirely on your own machine — no upload, no cloud account, no usage tracking.
Recommended System Requirements
The Free edition has no AI action recognition and only plays and compares videos; the table above is a conservative spec shared with the Universal Edition, so it runs comfortably below it.
