An interlaced video displays ugly comb-like artifacts that are visible to the eye when a video is displayed at a slower speed than originally captured. To get rid of such artifacts the video should be deinterlaced. So what is deinterlacing? It’s a conversion of an interlaced video (common analog TV signals or DVDrip) into a non-interlaced form. Deinterlacing helps eliminate such visual objects as edge flicking, jaggedness, line crawling, blur, etc.
The cause of the issue lies neither in computer configuration nor in the quality of a media player you use. It’s not a camcorder problem. It is determined by the way of a video image scanning. But such defects are not disastrous. They can be easily removed with the help of the right tool. Elmedia Player PRO is the best video deinterlacing software that can cope with any visual imperfections that your video may have.
Elmedia Player offers the deinterlacing feature in its PRO version, so deinterlacing MP4 on Mac is not a problem. You can also deinterlace AVI on Mac or any other formats with Elmedia. Enable this option in the Video tab in the app's Preferences. To deinterlace videos Elmedia Player PRO uses the Yadif video filter. It checks the pixels of previous, current and coming next frames to recreate the missed fields of the interlaced video with the local adaptive method (edge-directed interpolation). It also uses spatial check to prevent the appearance of most artifacts.
How to Deinterlace Video on Mac with Elmedia Player PRO
- Download Elmedia’s latest version and install it on your Mac.
- Activate Elmedia Player PRO. To do this copy and paste the activation code that was emailed to you after your payment was processed. Paste the code to the proper field in Elmedia’s settings and press OK. The activation is performed automatically. No reboot or restart is needed.
- Open the video that you are going to deinterlace in the player.
- Go to Preferences. Choose Video →"Deinterlace method" and check “ON”.
The video deinterlacing option offered by Elmedia Player PRO solves the playback issues. It doesn't fix the video permanently, however, it is quite sufficient for the majority of viewers and is easy to use. Right-click the video opened with Elmedia to add subtitles, adjust aspect ratio, fix audio and video delays. Enjoy great quality offered by Elmedia Player PRO!
Behind the Video Scenes
A video represents a series of still images that are displayed in a rapid succession. If the image display is not quick enough the resulting picture will be shaky. A smooth video playback on TV requires roughly 50 images per second. But let’s take a closer look.
A TV frame consists of 625 lines. The 576 of them are visible as they bear the information about the image, with 49 being supporting without any image content. To obtain a video signal the transmitted image gets decomposed into lines. There are 2 ways to do that: interlaced and progressive scanning.
With the interlaced scanning the lines get displayed on the screen out of sequence, e.g. not 1st, 2nd, 3rd, etc. They appear in the following order: at first odd-numbered lines and then even ones or vice versa. A frame gets divided into 2 half-frames which are called fields. Each field consists of odd numbered (1st, 3rd, 5th, etc.) and even numbered (2nd, 4th, 6th, etc.) lines. If a field has only odd-numbered lines, it’s an odd or upper field. A field containing only even-numbered lines is an even or lower field. The fields can appear in a different order.
Progressive scanning allows to transmit each line of the frame one after another, e.g. 1st, 2nd, 3rd, etc.
Interlaced vs Progressive Video
- A progressive video signal requires almost double bandwidth for transmission in contrast to the interlaced video.
- Progressive videos don’t have visual defects that are often called a "comb". Such drawbacks are usually associated with interlacing.
- A progressive video image doesn’t need anti-aliasing to eliminate flickering and comb. So the artifacts won’t appear.
- An interlaced video can’t be scaled to a higher resolution unlike a progressive one.
- An interlaced frame has 2 fields, so it can’t be saved as a separate image. Progressive scan allows this.
Here are some deinterlace methods or filters that are widely used today to remove the interlace defects.
No deinterlacing is provided. Everything is left as it is. It’s used for PsF content.
It’s somewhat a mixture of odd and even lines. With blending the lines are not displayed at different times.
This filter doubles lines and displays each part as a full frame. It keeps the temporal resolution that the interlaced video had.
With discarding method only one of the half-frames is exposed, the other one is left behind. The interlaced resolutions get cut in halves. This filter is great for slow computers. It also gives interlaced videos a movie-like look with judder.
It’s a combination of Bob and linear interpolation. Each line is not doubled but is made as the average of the previous and next coming lines.
This filter illustrates a half-frame that was made as the average of 2 original half-frames.
It creates a full image by using the odd lines from the odd half-frame. The even lines appear with the help of a complicated algorithm that takes data from both half-frames.
The filter makes a full image of the odd lines taken from the odd half-frame. It creates the even lines via a complicated algorithm that uses temporal as well as spatial interpolation.
Yadif (2x) (v1.1.0+)
It’s a mix of Bob and Yadif interpolation.
Phosphor displays the latest 2 half-frames. The old one fades out. This fade effect can be easily configured.
IVTC is an abbreviation for inverse telecine. The filter deletes telecine from NTSC telecined video in real time. As a result, the progressive signal is restored without losses.
Version 7.2.1(1778) (23rd Mar, 2019) Release notes