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FFmpeg

Change the resolution of a video​

ffmpeg -i original-video.mp4 -vf scale=640:-1 smaller-video.mp4

The first number is the width. The second value is the video's new height and -1 tells ffmpeg to decide for us, based on the file's original ratio.

Concatenate video files​

ffmpeg -i "concat:v0.mkv|v1.mkv|v2.mkv" -c copy output.mkv

Alternatively, if freezed frames appear for a couple of seconds in transition points, specifying the duration of each file (in seconds) can help.

echo file vid_0.mkv > list.txt
echo duration 235 >> list.txt
echo file vid_1.mkv >> list.txt
echo duration 17 >> list.txt
ffmpeg -f concat -i list.txt -c copy output.mkv
note

Entering the durations in the input file is optional and can also be used to shorten a video in the output.

Convert one audio/video format to another​

ffmpeg -i original-file.avi new-file.mp4

Crop video​

ffmpeg -i demo.mp4 -vf "crop=1100:768:0:0" out.mp4
  • 1100 = width
  • 768 = height
  • 0:0 = initial coordinates (from the top-left corner)

Trim audio or video file​

ffmpeg -i file.mkv -ss 00:00:20 -to 00:00:40 -c copy file-2.mkv