obs 是網路直播的免費軟體，裝在ubuntu 14.04 上試試。
install obs-studio on ubuntu 14.04: FFmpeg is required.
If you do not have FFmpeg installed (if you’re not sure, then you probably don’t have it), you can get it with the following commands:
sudo add-apt-repository ppa:kirillshkrogalev/ffmpeg-next
sudo apt-get update && sudo apt-get install ffmpeg
14.04/15.04+: You can install OBS with the following commands:
sudo add-apt-repository ppa:obsproject/obs-studio
sudo apt-get update && sudo apt-get install obs-studio
ffmpeg convert mp4 to gif
ffmpeg -t 3 -ss 00:00:02 -i small.mp4 -s 320×240 -r 10 small-clip.gif
-t 3 : 3sec
-r 10 : 10fp
-ss 00:00:02 : start time offset
-s 320×240 : size WxH
ps: 轉成GIF的畫質不如網站好。
來源 enjoy!
