ffmpeg tutorials
Table of Contents
- 1. Introduction
- 2. Live streaming with ffmpeg
- 3. Record audio with ffmpeg
- 4. Screen recording with ffmpeg
- 5. Concatenate multiple files
- 6. Merge video with audio and keeping the shortest duration (from video)
- 7. You can also split video.
- 8. You can also reduce file size drastically using this command.
- 9. Reduce the size of all the videos in a directory.
1 Introduction
ffmpeg is a great piece of software. It is a cross platform utility to modify audio and video. It can do lot of wonderful things like editing videos, encoding them and live streaming as well. In this post I want to share whatever little I know and have been exploring.
Installing it is easy. Just check your package manager but on Arch linux you can do sudo pacman -S ffmpeg and it should install it.
2 Live streaming with ffmpeg
I recently made a video explain how to use ffmpeg to live stream from local computer to YouTube using nothing but shell scripts.
Check the video here.
3 Record audio with ffmpeg
4 Screen recording with ffmpeg
ffmpeg -video_size 1368x768 -framerate 25 -f x11grab -i :0.0+0,30 -f pulse -i default -ac 2 rec-01.mp4
5 Concatenate multiple files
5.1 Create file.txt for the concatenate to work
for f in *.mp3 ; do echo "file '${f}'" >> file.txt; done;
5.2 While concatenating multiple videos remove audio using
ffmpeg -safe 0 -f concat -i file.txt -vcodec copy -an output.MOV
5.3 Concatenate audio files
ffmpeg -safe 0 -f concat -i file.txt -acodec copy all.mp3
6 Merge video with audio and keeping the shortest duration (from video)
ffmpeg -i output.MOV -i ~/Documents/sounds_youtube/tmp/all.mp3 -map 0:v -map 1:a -filter:a "volume=0.2" -vcodec copy -shortest final.MOV
7 You can also split video.
ffmpeg -i output.MOV -ss 00:00:00 -t 00:09:00 -c copy final.MOV
8 You can also reduce file size drastically using this command.
ffmpeg -i input.mp4 -vcodec libx265 -crf 28 output.mp4
9 Reduce the size of all the videos in a directory.
for f in *.MP4;do ffmpeg -i ${f} -vcodec libx265 -crf 28 small_${f};done;