71 lines
1.3 KiB
Markdown
71 lines
1.3 KiB
Markdown
---
|
|
title: ffmpeg
|
|
category: CLI
|
|
---
|
|
|
|
### Common switches
|
|
|
|
```bash
|
|
-codecs # list codecs
|
|
-c:v # video codec (-vcodec) - 'copy' to copy stream
|
|
-c:a # audio codec (-acodec)
|
|
```
|
|
|
|
```bash
|
|
-fs SIZE # limit file size (bytes)
|
|
```
|
|
|
|
### Bitrate
|
|
|
|
```bash
|
|
-b:v 1M # video bitrate (1M = 1Mbit/s)
|
|
-b:a 1M # audio bitrate
|
|
```
|
|
|
|
### Video
|
|
|
|
```bash
|
|
-aspect RATIO # aspect ratio (4:3, 16:9, or 1.25)
|
|
-r RATE # frame rate per sec
|
|
-s WIDTHxHEIGHT # frame size
|
|
-vn # no video
|
|
```
|
|
|
|
### Audio
|
|
|
|
```bash
|
|
-aq QUALITY # audio quality (codec-specific)
|
|
-ar 44100 # audio sample rate (hz)
|
|
-ac 1 # audio channels (1=mono, 2=stereo)
|
|
-an # no audio
|
|
-vol N # volume (256=normal)
|
|
```
|
|
|
|
## Example
|
|
|
|
### Ringtone conversion using ffmpeg
|
|
|
|
```bash
|
|
ffmpeg -i foo.mp3 -ac 1 -ab 128000 -f mp4 -acodec libfaac -y target.m4r
|
|
```
|
|
|
|
### To web
|
|
|
|
```bash
|
|
# no audio
|
|
ffmpeg -i input.mov -vcodec h264 -an -strict -2 output.mp4
|
|
ffmpeg -i input.mov -vcodec libvpx -an output.webm
|
|
```
|
|
|
|
```bash
|
|
ffmpeg -i input.mov -vcodec h264 -acodec aac -strict -2 output.mp4
|
|
ffmpeg -i input.mov -vcodec libvpx -acodec libvorbis output.webm
|
|
```
|
|
|
|
```html
|
|
<video width="320" height="240" controls>
|
|
<source src="movie.mp4" type='video/mp4'></source>
|
|
<source src="movie.webm" type='video/ogg'></source>
|
|
</video>
|
|
```
|