1046Resizing & Compressing Movies with ffmpeg

Resizing Movies with ffmpeg

Scaling down Full HD from 1920x1080 to 960x540:

ffmpeg -i input.mp4 -s 960x540 -c:a copy output.mp4

-i ... input
-s ... scale
-c ... codec

Compressing with H.2645

ffmpeg -i input.mp4 -vcodec libx265 -crf 28 output.mp4

crf ... video quality, lower value means better quality

1030Concatenating Videos with ffmpeg

Concatenating videos with the Quicktime Player requires unnecessary decoding/encoding, with takes time and computational resources.

Solution: Concatente Files von FFMPEG


Using ffmpeg

  1. Create a list: mylist.txt

    file '/path/to/file1.mp4'
    file '/path/to/file2.mp4'
    file '/path/to/file3.mp4'
  2. Run ffmpeg ffmpeg -f concat -i mylist.txt -c copy output.mp4


[concat @ 0x7fc407904080] Unsafe file name '2008-08-05 21_38_08.mov' mylist.txt: Operation not permitted

Filenames should not have spaces, escape them with \.

895QuickTime Player – Interrupted Video Recording Session

QuickTime Player Version can record movies. If the recording process in interrupted by battery running out, or the computer being closed and put to sleep, the video file is store at the following location: ~/Library/Containers/com.apple.QuickTimePlayerX/Data QuickTime Player Version: 10.4