IT/Software/Command Line Applications/ffmpeg

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This tool is amazingly broad.

We will only attempt to show a few of its key features.

Reduce Video size and maintain some quality.

ffmpeg -i input.mp4 -vcodec libx264 -crf 20 output.mp4

crf should vary between 18 and 24. The higher the number the higher the compression and lower the quality

Convert a whole directory.

for i in *.avi; do ffmpeg -i "$i" "${i%.*}.mp4"; done

You can add your parameters there like crf and -vcodec

Extract audio from video

• Change extension and names as needed.
• Path is relative unless noted.
• Single quotes are needed if you have spaces or any special character

ffmpeg -i '20150125 Word Blesses Us'.mp4 '20150125 Word Blesses Us'.mp3

Trim based on start and end time.

Try using this. It is the fastest and best ffmpeg-way I have figure it out:

 ffmpeg -ss 00:01:00 -i input.mp4 -to 00:02:00 -c copy output.mp4

This command trims your video in seconds!

Explanation of the command:

-i: This specifies the input file. In that case, it is (input.mp4).

-ss: Used with -i, this seeks in the input file (input.mp4) to position.

00:01:00: This is the time your trimmed video will start with.

-to: This specifies duration from start (00:01:40) to end (00:02:12).

00:02:00: This is the time your trimmed video will end with.

-c copy: This is an option to trim via stream copy. (NB: Very fast)