FFmpeg command: from beginner to proficient | ffmpeg command parameter description
FFmpeg command: from beginner to proficient | ffmpeg command parameter description
This section mainly introduces the common parameters of the ffmpeg command.
The main parameters
| project | illustrate |
|---|---|
| -i | Set input stream |
| -f | Set output format (format) |
| -ss | Starting time |
| -t | length of time |
Audio parameters
| project | illustrate |
|---|---|
| -aframes | Set the number of audio frames to output |
| -b:a | Audio bit rate |
| -ar | Set audio sample rate |
| -ac | Set the number of sound channels |
| -acodec | Set the sound codec. If copy is used, it means that the original codec data must be copied. |
| -an | Does not process audio |
| -of | audio filter |
Example:
ffmpeg -i test.mp4 -b:a 192k -ar 48000 -ac 2 -acodec libmp3lame -aframes 200 out2.mp3
Video parameters
| project | illustrate |
|---|---|
| -vframes | Set the number of video frames to output |
| -b or -b:v | Set video bitrate |
| -r | Set frame rate |
| -s | Set the width and height of the screen |
| -vn | Not processing video |
| -aspect aspect | Set aspect ratio (4:3, 16:9 or 1.3333, 1.7777) |
| -vcodec | Set the video codec. If copy is used, it means that the original codec data must be copied. |
| -vf | video filter |
Example:
ffmpeg -i test.mp4 -vframes 300 -b:v 300k -r 30 -s 640*480 -aspect 16:9 -vcodec libx265 out3.h265
More references
ffmpeg official documentation: ffmpeg Documentation