It also lets you change the dimensions of a video and for that, a specific video resizing command is required. Each of its functionalities can be used with respective commands. It is a command-based utility that consists of various libraries and programs to play, stream, record, and convert video and audio files. In this article, I am going to show you how to resize the dimensions of a video through the command-line interface in Windows 10.įFmpeg is a free and open-source video and audio processing software for Windows. Input #0, matroska,webm, from 'sample.mkv':ĭuration: 00:00:29.80, start: 0.You can reduce video size, change aspect ratio or resolution using command line with FFmpeg tool in Windows 10. Output of ffprobe -show_streams filename: ffprobe version 0.10.3 Copyright (c) 2007-2012 the FFmpeg developersīuilt on 17:51:07 with gcc 4.7.0 20120505 (prerelease)Ĭonfiguration: -prefix=/usr -enable-libmp3lame -enable-libvorbis -enable-libxvid -enable-libx264 -enable-libvpx -enable-libtheora -enable-libgsm -enable-libspeex -enable-postproc -enable-shared -enable-x11grab -enable-libopencore_amrnb -enable-libopencore_amrwb -enable-libschroedinger -enable-libopenjpeg -enable-librtmp -enable-libpulse -enable-gpl -enable-version3 -enable-runtime-cpudetect -disable-debug -disable-static

When encoding to MPG, it does get copied over and I get an exact copy, with the player switching sizes, but not with MKV.

This SAR value isn't getting copied over when encoding to MKV. It seems each frame is tagged with a Sample Aspect Ratio (SAR), so when the player plays it, it can find the display aspect ratio. The player size actually changes, atleast in mplayer, when the resolution is switched. the 16:9 parts to scale to 16:9, while the 4:3 parts scale to 4:3? How can I maintain the dynamic aspect ratio of the input video file i.e. The problem is that after the scaling, the resolution constantly becomes 4:3 (360x288). Also, VLC detects it's resolution as 720x576. I use ffmpeg -i -vf scale=iw/2:-1 -acodec copy. I want to scale this video down 3 times, while copying all the other attributes (audio codec, subtitles etc.). I have the first few seconds of widescreen 16:9 (1024x576) resolution, and the rest of the video if 4:3 (768x576) resolution. I have a mkv video, which is a mix of multiple resolution recordings, e.g.

Ffmpeg scale not working