FFMpeg

Installation

winget install --id=Gyan.FFmpeg -e

Convert format

To do a basic, automatic conversion, just specify the input file, and set a different extension on the output and FFMpeg will usually do the rest:

ffmpeg -i input.opus output.ogg

Trimming & Slicing

When exporting portions of a file, unless you're changing codec, you should use copy for the audio and video codecs.

• -ss to set the starting time: hh:mm:ss.mm
• -to to set the ending time: hh:mm:ss.mm
• -t to set the length of time in seconds to copy to the new stream.

e.g. to skip to 10 seconds in, and take the next 20 seconds and output to trimmed.mp4:

ffmpeg -i source.mp4 -acodec copy -vcodec copy -ss 00:00:10 -t 10 trimmed.mp4

To take a slice with a beginning time of 10 secs and an ending time of 30 secs into the video (for a total of 20 secs):

ffmpeg -i source.mp4 -acodec copy -vcodec copy -ss 00:00:10 -to 00:00:30 trimmed.mp4

Stripping audio, video or subtitles

• -an No audio
• -sn No subtitles
• -vn No video

Trim and burn in subtitles

ffmpeg -i source.mkv -ss 00:00:00 -t 90 -vf subtitles=source.mkv trimmed.mp4