MKV Editor, Extractor

Supported formats: all (which ffmpeg opens).
Output formats: mkv, mov, f4v, 3gp, mp4, flv, avi.
Functions:
– encode video to HEVC (x265)
– encode audio to AAC (ffmpeg), AC3 (ffmpeg)
– extract and add subtitles, audio, video, attachments
– editing tags, chapters