ffmpeg入门程序（ffmpeg入门常用命令分类）

今天我们学常用命令分类中的基本查询命令：

下面我们看看几个命令

• ffmpeg -demuxers
• ffmpeg -demuxers | more 分屏查看 下面是一部分可支持的解复用格式

File formats: D. = Demuxing supported .E = Muxing supported -- D 3dostr 3DO STR D 4xm 4X Technologies D aa Audible AA format Files D aac raw ADTS AAC (Advanced Audio Coding) D ac3 raw AC-3 D acm Interplay ACM D act ACT Voice file format D adf Artworx Data Format D adp ADP D ads Sony PS2 ADS D adx CRI ADX D aea MD STUDIO audio D afc AFC D aiff Audio IFF D aix CRI AIX D alaw PCM A-law D alias_pix Alias/Wavefront PIX image D alp LEGO Racers ALP

ffmpeg -muxers

ffmpeg -muxers | more

File formats: D. = Demuxing supported .E = Muxing supported -- E 3g2 3GP2 (3GPP2 file format) E 3gp 3GP (3GPP file format) E a64 a64 - video for Commodore 64 E ac3 raw AC-3 E adts ADTS AAC (Advanced Audio Coding) E adx CRI ADX E aiff Audio IFF E alaw PCM A-law E amr 3GPP AMR E apng Animated Portable Network Graphics E aptx raw aptX (Audio Processing Technology for Bluetooth) E aptx_hd raw aptX HD (Audio Processing Technology for Bluetooth) E asf ASF (Advanced / Active Streaming Format) E asf_stream ASF (Advanced / Active Streaming Format) E ass SSA (SubStation Alpha) subtitle E ast AST (Audio Stream) E au Sun AU

C 音视频开发学习资料：点击领取→音视频开发（资料文档 视频教程 面试题）（FFmpeg WebRTC RTMP RTSP HLS RTP）

ffmpeg -devices

Devices: D. = Demuxing supported .E = Muxing supported -- D avfoundation AVFoundation input device D lavfi Libavfilter virtual input device E sdl,sdl2 SDL2 output device

ffmpeg -codecs

Codecs: D..... = Decoding supported D表示解码器 .E.... = Encoding supported E表示编码器 ..V... = Video codec V:视频编解码 ..A... = Audio codec A:音频编解码 ..S... = Subtitle codec S:字幕 ...I.. = Intra frame-only codec I:帧内预测压缩编码 ....L. = Lossy compression L :有损压缩 .....S = Lossless compression S:无损压缩 ------- D.VI.S 012v Uncompressed 4:2:2 10-bit D.V.L. 4xm 4X Movie D.VI.S 8bps QuickTime 8BPS video .EVIL. a64_multi Multicolor charset for Commodore 64 (encoders: a64multi ) .EVIL. a64_multi5 Multicolor charset for Commodore 64, extended with 5th color (colram) (encoders: a64multi5 ) D.V..S aasc Autodesk RLE D.V.L. agm Amuse Graphics Movie D.VIL. aic Apple Intermediate Codec DEVI.S alias_pix Alias/Wavefront PIX image DEVIL. amv AMV Video D.V.L. anm Deluxe Paint Animation

我们查找一下264编码

ffmpeg -codecs | grep 264

DEV.LS h264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (encoders: libx264 libx264rgb h264_videotoolbox )

ffmpeg -formats

File formats: D. = Demuxing supported .E = Muxing supported -- D 3dostr 3DO STR E 3g2 3GP2 (3GPP2 file format) E 3gp 3GP (3GPP file format) D 4xm 4X Technologies E a64 a64 - video for Commodore 64 D aa Audible AA format files D aac raw ADTS AAC (Advanced Audio Coding) DE ac3 raw AC-3 D acm Interplay ACM D act ACT Voice file format D adf Artworx Data Format D adp ADP D ads Sony PS2 ADS E adts ADTS AAC (Advanced Audio Coding) DE adx CRI ADX D aea MD STUDIO audio D afc AFC DE aiff Audio IFF

查看是否支持MP3格式

ffmpeg -formats | grep mp3

DE mp3 MP3 (MPEG audio layer 3)

ffmpeg -bsfs

Bitstream filters: aac_adtstoasc av1_frame_merge av1_frame_split av1_metadata chomp dump_extra dca_core eac3_core extract_extradata filter_units h264_metadata h264_mp4toannexb h264_redundant_pps hapqa_extract hevc_metadata hevc_mp4toannexb imxdump mjpeg2jpeg mjpegadump mp3decomp mpeg2_metadata mpeg4_unpack_bframes mov2textsub noise null opus_metadata pcm_rechunk prores_metadata remove_extra text2movsub trace_headers truehd_core vp9_metadata vp9_raw_reorder vp9_superframe vp9_superframe_split

1. 录制屏幕视频 ffmpeg -f avfoundation -i 1 -r 30 out.YUV ffmpeg -f avfoundation -i1 -r 30 -pixel_format yuv420p out.yuv
2. 录制音频 ffmpeg -f avfoundation -i :0 out.wav ffmpeg -f avfoundation -i :0 -sample_rate 44100 -channels 2 out.wav ffmpeg -f avfoundation -i :0 -ar 44100 -ac 2 out.wav
3. 查找avfoundation库下支持的设备 ffmpeg -f avfoundation -list_devices true -i ""

avfoundation库下支持的设备 [AVFoundation indev @ 0x7fb857609780] AVFoundation video devices: [AVFoundation indev @ 0x7fb857609780] [0] FaceTime高清摄像头（内建） [AVFoundation indev @ 0x7fb857609780] [1] Capture screen 0 [AVFoundation indev @ 0x7fb857609780] AVFoundation audio devices: [AVFoundation indev @ 0x7fb857609780] [0] 外置麦克风 [AVFoundation indev @ 0x7fb857609780] [1] MacBook Pro麦克风

4.播放视频

ffmpeg -video_size 2880x1800 -pixel_format uyvy422 out.yuv

5.播放音频

ffmpeg out.wav

分解与复用

• 保留编码格式 ffmpeg -i input.mp4 -vcodec copy -acodec copy out.flv

抽取视频

• 保留编码格式 ffmpeg -i input.mp4 -vcodec copy -an outcopy.h264
• 强制格式 ffmpeg -i input.mp4 -vcodec libx264 -an out.h264

C 音视频开发学习资料：点击领取→音视频开发（资料文档 视频教程 面试题）（FFmpeg WebRTC RTMP RTSP HLS RTP）

抽取音频

• 保留编码格式 ffmpeg -i input.mp4 -vn -acodec copy outcopy.aac
• 强制格式 ffmpeg -i input.mp4 -vn -acodec libmp3lame out.mp3

• 数据分辨率和源视频一致 ffmpeg -i input.mp4 out.yuv
• 分辨率转为320x240 ffmpeg -i input.mp4 -video_size 320x240 out.yuv

提取RGB

ffmpeg -i input.mp4 -pixel_format rgb24 out.rgb

RGB和YUV之间的转换

ffmpeg -pixel_format yuv420p -video_size 960x544 -i input.yuv -pixel_format rgb24 out.rgb

抽取PCM

ffmpeg -i input.mp4 -vn -ar 44100 -ac 2 -f s16le out.pcm

播放pcm ffplay -ar 44100 -ac 2 -f s16le out.pcm

抽取YUV

ffmpeg -i input.mp4 -an -vcodec rawvideo -pixel_format yuv420p out.yuv

抽取PCM

ffmpeg -i input.mp4 -vn -ar 44100 -ac 2 -f s16le out.pcm

5.滤镜命令

在学滤镜命令之前 我们先了解一下分解与复用过程

分解与复用

滤镜实际上是对解码后的数据帧进行滤镜处理 过程如下：

裁剪命令

• ffmpeg -i input.mp4 -vf crop=in_w-200:in_h-200 -c:v libx264 -c:a copy out.mp4 crop格式： crop=out_w:out_h:x:y

6.裁剪与合并命令

裁剪命令

• ffmpeg -i input.mp4 -ss 00:00:00 -t 10 out.mp4

合并命令

• ffmpeg -f concat -i input.txt out.mp4

7. 图片、视频互转命令

视频转图片

• ffmpeg -i input.mp4 -r 1 -f image2 image-=.jpeg

图片转视频

• ffmpeg -i image-=.jpeg out.mp4

直播相关命令 推流命令

• ffmpeg -re -i input.mp4 -c copy -f flv rtmp://......

拉流命令

• ffmpeg -i rtmp://.... -c copy out.mp4

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