01_ffmpeg

Example code

Typical video conversion command:

ffmpeg -hide_banner -loglevel Warning -i input.webm -c:a aac -b:a 128k -c:v libx264 -b:v 1000k -s 1920x1080 -r 25 output.mp4

### remove audio from file:

ffmpeg -i 1.mp4 -c copy -an out.mp4

### Video to audio

ffmpeg -i 1.mp4 -vn out.mp3

### speed up/down:

ffmpeg -i 1.mp4 -filter:v "setpts=PTS/10" output.mp4

### concat file from file list:

ffmpeg -f concat -safe 0 -i list.txt -c copy output.mp4

content of list .txt:

file '/home/davood/Desktop/video/out.mp4' file '/home/davood/Desktop/video/out2.mp4'

### remove extra text:

ffmpeg -hide_banner ...

### use cuda:

ffmpeg -hwaccel cuda ...

### just copy audio:

ffmpeg -c:a copy ...

### just copy video:

ffmpeg -c:v copy ...

### set audio container to AAC and bitrate to 128k:

ffmpeg -i input.mp4 -c:v copy -c:a libfdk_aac -b:a 128k output.mp4

it might not work in windows, so use built-in AAC:

... -c:a aac ...

### set video container to H.264 and bitrate to 1MB/s:

ffmpeg -i input -c:v libx264 -c:a copy output.mp4

### two pass encoding:

> Windows users should use NUL instead of /dev/null and ^ (in command prompt) or ` (in PowerShell) instead of \.

ffmpeg -y -i input -c:v libx264 -b:v 2600k -pass 1 -an -f null /dev/null &&
ffmpeg -i input -c:v libx264 -b:v 2600k -pass 2 -c:a aac -b:a 128k output.mp4

### change dimension:

ffmpeg -i input.mp4 -s 1920x1080 output.mp4

### change frame rate:

ffmpeg -i input.mp4 -r 25 output.mp4

### rotation:

ffmpeg -i in.mov -vf "transpose=1" out.mov

0 = 90CounterCLockwise and Vertical Flip (default) 1 = 90Clockwise 2 = 90CounterClockwise 3 = 90Clockwise and Vertical Flip

### cut a part of file:

//// with start and stop time: ffmpeg -i input.mp4 -ss 00:01:00 -to 00:02:05 output.mp4

//// with start and duration(in seconds): ffmpeg -i input.mp4 -ss 00:01:00 -t 100 output.mp4

### set encoding preset:

... -preset ultrafast ... ... -preset veryslow ...

### set lossless H.264:

... -qp 0 ...

### restict CPU usage
to use 2 cores:

• threads 2

### Log levels

ffmpeg -loglevel

defaul level is warning. available log levels, from less info to more info:

Quiet Panic Fatal Error Warning Info Verbose Debug

[reference](https://opensource.com/article/17/6/ffmpeg-convert-media-file-formats)

[reference on presets and encoding](https://trac.ffmpeg.org/wiki/Encode/H.264)