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ffmpeg
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# 基础查询命令 | |
ffmpeg -muxers | |
ffmpeg -demuxers | |
ffmpeg -codecs | |
ffmpeg -decoders | |
ffmpeg -encoders | |
ffmpeg -formats | |
ffmpeg -devices | |
ffmpeg -layouts | |
ffmpeg -sample_fmts | |
ffmpeg -filters | |
ffmpeg -protocols | |
ffmpeg -bsfs | |
ffmpeg -f avfoundation -list_devices true -i "" | |
# 录制视频 | |
ffmpeg -f avfoundation -i 1 -r 30 -s 2880x1800 t.yuv | |
# 录制音频 | |
ffmpeg -f avfoundation -i :0 sound.wav | |
# 分解与复用 | |
ffmpeg -i demo.flv -vcodec copy -acodec copy demo_out.mp4 | |
## 抽取视频 -an 不要音频 | |
ffmpeg -i demo.mov -an -vcodec copy demo_out.h264 | |
## 抽取音频 -vn 不要视频 | |
ffmpeg -i demo.mov -vn -acodec copy demo_out.aac | |
# 提取 YUV 数据 | |
ffmpeg -i input.mp4 -an -c:v rawvideo -pix_format yuv420p out.yuv | |
# ffmpeg 提取 PCM 数据 | |
-ar audio rate 44.1k | |
-ac audio channel 单声道 双声道 | |
-f 数据存储格式 | |
signed 16bit little end | |
ffmpeg -i input.mp4 -vn -ar 44100 -ac 2 -f s16le out.pcm | |
ffplay -ar 44100 -ac 2 -f s16le out.pcm | |
# 滤镜 加水印、去水印、画中画、视频裁剪、音频倍速 | |
## 视频裁剪 | |
### 宽度-200 | |
视频编码器 libx264 | |
音频编码器 copy | |
ffmpeg -i input.mov -vf crop=in_w-200:in_h-200 -c:v libx264 -c:a copy out.mp4 | |
# -ss 00:00:01 秒开始, 持续时间 -t 10 s | |
ffmpeg -i input.move -ss 00:00:01 -t 10 out.ts | |
### inputs.txt 文件列表 | |
#### 内容格式 | |
file '1.ts' | |
file '2.ts' | |
file '3.ts' | |
ffmpeg -f concat -i inputs.txt out.flv | |
# 图片与视频互转 | |
# -r rate 张/s -f format | |
ffmpeg -i input.flv -r 1 -f image2 image-%3d.jpeg# 分解与复用 | |
# 图片转视频 | |
ffmpeg -i image-%3d.jpeg out.mp4 | |
# 直播推流 | |
ffmpeg -re -i out.mp4 -c copy -f flv rtmp://server/live/streamName | |
# 直播拉流 | |
ffmpeg -i rtmp://server/live/streamName -c copy dump.flv | |
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cmake_minimum_required(VERSION 3.15) | |
project(learning_demos C) | |
set(CMAKE_C_STANDARD 11) | |
include_directories("/usr/local/Cellar/ffmpeg/4.2.1_1/include") | |
link_directories("/usr/local/Cellar/ffmpeg/4.2.1_1/lib") | |
find_package(sdl2) | |
include_directories(${SDL2_INCLUDE_DIRS}) | |
aux_source_directory(player PLAYER) | |
aux_source_directory(. CURRENT_DIR) | |
add_executable(learning_demos main.c ${PLAYER} ${CURRENT_DIR} ) | |
target_link_libraries( | |
learning_demos | |
avcodec | |
avdevice | |
avfilter | |
avformat | |
avresample | |
avutil | |
postproc | |
swresample | |
swscale | |
) |
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