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Deinterlacing is the process of converting interlaced video into a non-interlaced or progressive form. Interlaced video signals are commonly found in analog television , VHS , Laserdisc , digital television ( HDTV ) when in the 1080i format, some DVD titles, and a smaller number of Blu-ray discs.
Playing back interlaced video from a DVD, digital file or analog capture card on a computer display instead requires some form of deinterlacing in the player software and/or graphics hardware, which often uses very simple methods to deinterlace. This means that interlaced video often has visible artifacts on computer systems.
VLC media player (previously the VideoLAN Client and commonly known as simply VLC) is a free and open-source, portable, cross-platform media player software and streaming media server developed by the VideoLAN project. VLC is available for desktop operating systems and mobile platforms, such as Android, iOS and iPadOS.
Note that operating system support does not mean whether video encoded with the codec can be played back on the particular operating system – for example, video encoded with the DivX codec is playable on Unix-like systems using free MPEG-4 ASP decoders (FFmpeg MPEG-4 or Xvid), but the DivX codec (which is a software product) is only available ...
Line doubling is a literal way to deinterlace an interlaced signal, although the method used may differ. Typically the use of the term "line doubler" refers to a simple repeat of a scanline so that the lines in a field match the lines of a frame. However, this produces a "bobbing" effect and has led to this method of deinterlacing being ...
Video shot with a standard video camera format such as S-VHS or Mini-DV is often interlaced when created. In contrast, video shot with a film-based camera is almost always progressive. Free-to-air analog TV was mostly broadcast as interlaced material because the trade-off of spatial resolution for frame rate reduced flickering on cathode-ray ...
Every interlaced video frame has two fields for each frame. The three-two pull down is where the telecine adds a third video field (a half frame) to every second video frame, but the untrained eye cannot see the addition of this extra video field. In the figure, the film frames A–D are the true or original images since they have been ...
For interlaced video HEVC can change between frame coding and field coding using Sequence Adaptive Frame Field (SAFF), which allows the coding mode to be changed for each video sequence. [138] This allows interlaced video to be sent with HEVC without needing special interlaced decoding processes to be added to HEVC decoders.