FFmpeg常用命令集合
来源:互联网 发布:淘宝怎么成为大v 编辑:程序博客网 时间:2024/06/16 12:33
之前很多文章都写到编解码里了,以后的FFmpeg相关文章会直接写到"FFmpeg"类别中;
更多文章,可以参考FFmpeg官方网站https://ffmpeg.org/,文档 和 https://trac.ffmpeg.org/wiki
这里先说音频解码:
如:ffmpeg -i input.flv -f s16le -acodec pcm_s16le output.raw
from:https://trac.ffmpeg.org/wiki/audio%20types
Audio Types
FFmpeg can read various raw audio types (sample formats) and demux or mux them into different containers (formats). For example, you can read and write raw PCM audio into a WAV container.
Sample Formats
Raw audio in FFmpeg can take several different "forms", i.e. sample formats. For instance:
- s means "signed" (for the integer representations), u would mean "unsigned"
- 16 means 16 Bits per sample
- le means "little endian" coding for the samples
You can see a list of supported sample formats by inspecting the ffmpeg -formats output:
$ ffmpeg -formats | grep PCM DE alaw PCM A-law DE f32be PCM 32-bit floating-point big-endian DE f32le PCM 32-bit floating-point little-endian DE f64be PCM 64-bit floating-point big-endian DE f64le PCM 64-bit floating-point little-endian DE mulaw PCM mu-law DE s16be PCM signed 16-bit big-endian DE s16le PCM signed 16-bit little-endian DE s24be PCM signed 24-bit big-endian DE s24le PCM signed 24-bit little-endian DE s32be PCM signed 32-bit big-endian DE s32le PCM signed 32-bit little-endian DE s8 PCM signed 8-bit DE u16be PCM unsigned 16-bit big-endian DE u16le PCM unsigned 16-bit little-endian DE u24be PCM unsigned 24-bit big-endian DE u24le PCM unsigned 24-bit little-endian DE u32be PCM unsigned 32-bit big-endian DE u32le PCM unsigned 32-bit little-endian DE u8 PCM unsigned 8-bit
These represent all the built-in raw audio sample formats.
Reading and Writing Raw Audio
FFmpeg can take input of raw audio types by specifying the type on the command line. For instance, to convert a "raw" audio type to a ".wav" file:
ffmpeg -f pcm_s32le input_filename.raw output.wav
You can specify number of channels, etc. as well, ex:
ffmpeg -f u16le -ar 44100 -ac 1 -i input.raw output.wav
The default for muxing into WAV files is pcm_s16le. You can change it by specifying the audio codec and using the WAV file extension:
ffmpeg -i input -c:a pcm_s32le output.wav
which will create a WAV file containing audio with that codec (not a raw file). There are also other containers that can contain raw audio packets, like pcm_bluray.
If you want to create a raw file, don't use the WAV format, but the raw one (as seen in the table above), e.g. s16le, and the appropriate audio codec:
ffmpeg -i input -f s16le -c:a pcm_s16le output.raw
- FFmpeg常用命令集合
- ffmpeg常用命令
- ffmpeg常用命令
- ffmpeg 常用命令
- ffmpeg常用命令
- ffmpeg常用命令
- ffmpeg常用命令
- FFmpeg 常用命令
- ffmpeg常用命令
- ffmpeg常用命令
- ffmpeg常用命令
- FFMPEG常用命令
- ffmpeg 常用命令
- ffmpeg 常用命令
- ffmpeg常用命令
- ffmpeg常用命令
- ffmpeg 常用命令
- FFmpeg常用命令
- dl4j的BaseLayer前向与反向传播算法计算过程简介
- Python 2.7 拾遗(3)
- try-with-resources资源自动释放特性
- 菜鸡日常刷CF # 452DIV2 前三题
- Map.putAll()的用法
- FFmpeg常用命令集合
- 修改包名Xcode
- OpenGL: 模板缓冲区的理解
- 程序员 30 岁前,该如何规划自己的职业发展?
- dubbo2.5.3注解版
- 规则引擎
- mysql
- 共享内存通信
- jquery