HandBrake
https://handbrake.fr/
動画変換
内部でffmpeg使ってるので、実質ffmpeg（適当）
https://handbrake.fr/docs/en/1.7.0/technical/source-formats.html
One of HandBrake’s strengths is its ability to open a wide variety of video formats. HandBrake uses FFmpeg libavformat and libavcodec libraries under the hood and generally can open whatever FFmpeg will, in addition to disc-based formats like DVD and Blu-ray.
#PC便利