Dual Movie Player
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A video player with unified controls for simultaneous video playback, pause, and frame-by-frame navigation, making it easier to compare movements.
A video player that lets you play two videos side by side with normal playback and frame-by-frame functionality. It supports YouTube videos as well as your own recordings and works across multiple devices, making it versatile and accessible in any environment.
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How-to Use
Select two videos
Upload two recorded videos or choose Youtube URLs. Check your web browser's compatibility below.
Analyze
Click the unified control button and play, forward & rewind frames both videos simultaneously.
Video Format Compatibility
Your current web browser supports the following video formats. Please use a web browser depending on a file format you'd like to use.
System Features
Side by side video player
Two videos can be played simultaneously using common buttons. You can compare your own movements with others to improve your form.
Compatible with YouTube videos
You can play YouTube videos by simply entering the URL. You can also playback videos that you have taken yourself side by side.
Frame-by-frame playback
Two videos can be played back frame by frame using the common frame advance button. You can compare the decisive moment of two videos precisely.
Adjustable Playback Range
By specifying the playback range displayed on the playback bar of each video, the specified range can be repeatedly looped.
Playback speed
Playback speed can be specified for each video, supporting 1, 0.5, 0.25, and 0.1x playback.
Video Mask
Normally, the video field is protected by a transparent frame to avoid unintended interference. It can be removed from the option box if necessary.
Multi Device
Operates on PCs, smartphones, tablets, and other media. For better visibility, a certain display size is recommended, such as a PC.
Keyboard operation
For PC, use Arrow keys to send frame-by-frame, Control key + Arrow key to send/rewind 3 seconds, and Space key for play/stop.
Full Screen
A single video can be displayed in full screen to analyze the behavior on a larger screen.
Adjustable Frame Rate
Since the frame rate varies from video to video, please adjust the frame rate for each video. See the section on frame rate for more information.
About Frame Rate
It is important to understand the concept of frame rate in order to use this system more conveniently.
What is the frame rate anyway?
Common in movies and cinematic clips. It is perceived by the human eye as 'cinematic' motion.
Standard frame rate used for TV shows and many online videos.
It is used in situations where smoothness is required, such as games, sports broadcasts, and slow motion video.
Very high frame rates for fast cameras and special slow motion effects.
Note
The problem is that different videos have different frame rates. For example, suppose you select a 5 fps video and a 30 fps video. At this time, the 5fps video has 5 frames per second and the 30fps video has 30 frames per second.
At this time, sending 5 frames in a 5 fps video will advance the video by 1 second, but in a 30 fps video, even if 5 frames are sent, the video will stay at the beginning of 1 second. The number of frames that can be sent in a typical frame-by-frame player is fixed, but if two videos send the same number of frames, the amount of forward movement will vary from one video to another.
To solve this problem, this system has a function to specify the number of frames to be fed frame by frame for each video. In the example in the image, the system is set to operate for only 5 frames for a 5 fps video and 30 frames for a 30 fps video, so that when the frame advance button is pressed, the system operates for 1 second for the two videos.
FAQ
What can this system do?
This system allows you to play various video formats including Youtube videos side-by-side on your web browser. Use it to compare your movements with others.
What file formats are supported?
Please refer to the Video Compatibility section.
Why can I NOT interact with videos by clicking them?
The system covers videos with Masks to avoid unintentional interaction with the videos. You can deactivate them from the setting buttons.
How do I hide Youtube's related videos?
Youtube related videos are displayed according to Youtube's specifications and are not allowed to be hidden completely, and must be closed by pressing the close button that appears in the upper right corner of the related video. However, to avoid unintentional interference with the video, the video has a transparent layer. To remove this layer, click on the settings button (three-line hamburger icon) for each video and turn off Video Mask.
How to remove the Youtube Related Videos section?
Deactivate Video Mask from the setting button and close the Related Video section manually.
How is data privacy protected?
Users activity is securely managed and is not shared with third parties.
Is Smartphone supported?
Yes, it’s accessible from PCs, smartphones, and tables. There's no need to install any application, but please be aware of the difference between web browsers behavior.
Is it free to use?
Yes, this whole system and all features are available for free.
