This feature serves as a direct replacement for the MEncoder component of MPlayer, which was a separate program rather than being built into the player.

This allows mpv to work as a transcoder, supporting many video formats.

Encoding subsystem mpv includes a new video encoding mode that can be used to save files being played under different formats.

This form of player control, along with a JSON IPC mechanism, replaces MPlayer's 'slave mode'. An example of an application which uses libmpv is Plex. This required making all mpv code thread safe.

Improved client API Beyond working as a stand-alone media player, mpv is designed to be used directly by other applications through a library interface called libmpv.

Audio scaling algorithm The player is equipped with a scaletempo2 parameter for speed changing at constant pitch, for which it uses the Waveform Similarity Overlap-and-add (WSOLA) algorithm, citing more smoothness than the original scaletempo used in the original mplayer, and rubberband.

High quality video output mpv includes a customizable video output driver based on OpenGL as well as the Vulkan API, which supports over 100 options for controlling playback quality, including the use of advanced upscaling filters, color management, and customizable pixel shaders.

This allows mpv to replace site-specific video players based on Adobe Flash or HTML5.

Video websites By using youtube-dl, mpv natively supports playback of high-definition video (HD) content and audio on YouTube and over 1000 other supported sites.

This was intended to make interaction easier for new users and to enable precise and direct seeking. Mpv has had several notable changes since it was forked from MPlayer the most user-visible being the addition of an on-screen-controller (OSC) minimal GUI integrated with mpv to offer basic mouse-controllability.

Since June 2015, the project's source code is in the process of being relicensed from GNU General Public License version 2 (GPLv2) or later to GNU Lesser General Public License version 2.1 (LGPLv2.1) or later to allow using mpv as a library in more applications. As a result, the project had a large influx of contributions. The motive for the fork was to encourage developer activity by removing unmaintainable code and dropping support for very old systems. Mpv was forked by Vincent Lang, also known as wm4, in 2012 from mplayer2, which was forked in 2010 from MPlayer.

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