(Whether this works depends on VOĭriver support.) Ctrl s Take a screenshot, as the window shows it (with subtitles, OSD, and scaled sub-ass-vsfilter-aspect-compat for more info. V Toggle subtitle VSFilter aspect compatibility mode. Overriding them almost completely with the normal subtitle style. u Switch between applying no style overrides to SSA/ASS subtitles, and Adjust audio delay (A/V sync) by +/- 0.1 seconds. x and z Adjust subtitle delay by +/- 0.1 seconds. j and J Cycle through the available subtitles. O Toggle OSD states between normal and playback time/duration. o (also P) Show progression bar, elapsed time and total duration on the OSD. w and e Decrease/increase pan-and-scan range. # Cycle through the available audio tracks. _ Cycle through the available video tracks. Playing the sameįile later will resume at the old playback position if possible. Q Like q, but store the current playback position. One frame in reverse and then go into pause mode again. Pressing once will pause, every consecutive press will play User nfįiles and Lua scripts can define additional key bindings. SeeĮtc/nf for a list of default bindings. The following listings are not necessarily complete. See the -input- options for ways to customize it. No LIRC support - configure remotes as input devices instead). Mpv has a fully configurable, command-driven control layer whichĪllows you to control mpv using keyboard, mouse, or remote control (there is Usage examples to get you started quickly can be found at the end Of different video and audio output methods are supported. Variety of sources other than disk files. Special input URL types are available to read input from a Supports a wide variety of video file formats, audio and video codecs, and Mpv is a media player based on MPlayer and mplayer2. The above command will scale the video to 2560×1440 with lanczos.Mpv - a media player SYNOPSIS ¶ mpv You can apply a certain algorithm with flags= ffmpeg -i input.mp4 -vf scale=2560:1440:flags=lanczos output.mp4 The image above edited from compares the scaling algorithm methods. The default is bicubic, with lanczos being very popular. However, this link here from user slhck gives a good run down for image/video algorithms. This is a very complex methodology, more than a few sentences can fully explain. The most complex of them all, specifying what video scaling algorithm to use when scaling. You can read more about the encoding options here and here. Scale a video and also encode or compress it at the same time: ffmpeg -i input.mp4 -vf scale=3840:2560 -c:v libx264 -preset fast -crf 22 output.mp4 So if it was a video of 16:9 ratio then output.mp4 will be 1280×720. This sets the width of the video as 1280 and then will automatically calculate the height keeping with the ratio of the input video. If you want to scale a video to a custom width but keep the ratio you can input -1 after the width: ffmpeg -i input.mp4 -vf scale=1280:-1 output.mp4 Make a video half its original size: ffmpeg -i input.mp4 -vf scale=iw/2:ih/2 output.mp4 Scaling by resolution with the ratio To double a videos resolution: ffmpeg -i input.mp4 -vf scale=iw*2:ih*2 output.mp4 To scale the video file by “times its self” such as twice as large or twice as small you can use variables * or / along with iw and ih to specify the input width and input height respectively. This will upscale input.mp4 to be 4k resolution. If you know the desired resolution, simply setting the specific width and height for scaling with the scale flag: ffmpeg -i input.mp4 -vf scale=3840:2560 output4k.mp4 There is no flag or parameter to do either upscaling or downscaling rather this is determined by the values set for the scale flag. Or an advanced scale with flags and encoding: ffmpeg -i input.mp4 -vf scale=2560x1440:flags=lanczos -c:v libx264 -preset slow -crf 20 output_compress_1440p.mp4 The basis of scaling a video with FFmpeg uses the scale flag after the filtergraph ( -vf), then you can either do basic video scaling such as upscaling the video to twice the original resolution: ffmpeg -i input.mp4 -vf scale=iw*2:ih*2 output.mp4 Scaling a video means to make it either larger (higher resolution) or smaller (smaller resolution). How to do video scaling using FFmpeg with examples for different types of upscaling and downscaling methods.
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