Why would anyone want to do that? The answer lies in different framerates, and in transfer of film sources to television and video. Telecine produces a characteristic look, with a repeating sequence of 3 progressive frames followed by 2 artificially interlaced frames. It is a type of artificial interlacing that may be added to sources that were originally progressive. In addition to true interlaced signals, there exists also a process called telecine which produces interlacing. The hysteresis helps with unreliable interlaced flags. After 30s of progressive video, the filter is removed. As such, it is not really reliable (for 25fps at least).Īs soon as a picture is detected as interlaced, the configured deinterlace mode is applied. The detection is based on the progressive/interlaced flags transported at the codec level. The version control history (git log) says the following about the Automatic mode (see ): For more information on using VLC from the command line, see VLC command-line help. Note that the deinterlace command-line options are prefixed by "sout" for historical reasons only they are intended for normal playback use. To get a list and short description of the available options, run vlc -p deinterlace -advanced If you use VLC from the command line, you can also set the deinterlace options in your command. The keyboard shortcut to switch deinterlacing on and off can be configured in the Hotkeys section of the Simple Preferences. If you want to always enable deinterlacing on every video, type "Deinterlace" in the Video Filter preferences. When the video ends, both the on/off/automatic and the mode settings will return to the values set in the preferences. Note that if you enable deinterlacing from the menu, the setting will only take effect for the currently playing video. The available settings are the mode (algorithm), and in v1.2.0+ also some algorithm-specific settings. In All Preferences, the settings for deinterlacing can be found in Preferences > Video > Filters > Deinterlace. The most reliable choice is to switch deinterlacing on/off manually when needed. The setting Off, respectively, always keeps deinterlacing off. If the setting is On, VLC will apply deinterlacing even if the original is not interlaced (which is a really bad idea). However, the detection is not always reliable. In the mode Automatic, VLC will check the stream flags (technical term for information embedded in the video) and automatically set deinterlacing on or off, depending on if the current video is marked as interlaced even in animated movies on DVDs. See below for available modes and mode recommendations. You can also choose the mode (algorithm). This setting controls whether VLC enables deinterlacing when you open a video. You can choose from On, Automatic or Off. To change the settings, go to the Video section in the Simple Preferences. It switches deinterlacing on and off (using the mode selected in the Preferences). You can enable it for the currently playing video by using the main menus, the right-click menus or by using hotkey (by default: D). VLC media player has deinterlacing off by default. Much like computer-based video players, they have deinterlacing built in so that they can display traditional TV material.Ī very good description of the problem and the various ways of deinterlacing can be found at. Modern HDTVs operate much like computers in that they display full pictures. So to get optimum quality when displaying TV-material (such as DVDs) on a computer, the player can convert the alternating half-pictures to full pictures. That way, they can get a fast display rate of 50 or 60 half-pictures per second, without the bandwidth requirements that full pictures have.Ĭomputers however, do display full pictures, typically at a rate of at least 60 pictures per second. Instead, they display alternately all the odd lines and all the even lines of the picture. Traditional TVs do not display one picture-frame at a time.
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