sdl SDLoutput devicecodecs 命令 所有的编解码器ffmpeg -codecsCodecs: 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 4:2:10-bit D.V.L. 4xm 4X Movie D.VI.S 8bps QuickTime 8BPS video .EVIL. a64_multi Multicolor charset for Commodore 6(encoders: a64multi ) .EVIL. a64_multi Multicolor charset for Commodore 6 extended with 5th color (colram) (encoders: a64multi) 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 Animationffmpeg -codecs | grep 264DEV.LS h26 H.26/ AVC / MPEG-AVC / MPEG-part 1(encoders: libx26libx264rgb h264_videotoolbox ) formats命令 支持的文件格式ffmpeg -formatsFile formats: D. = Demuxing supported .E = Muxing supported -- D 3dostr 3DO STR E 3g 3GP(3GPPfile format) E 3gp 3GP (3GPP file format) D 4xm 4X Technologies E a6 a6- video for Commodore 6D aa Audible AA format files D aac raw ADTS AAC (Advanced Audio Coding) DE ac raw AC-D acm Interplay ACM D act ACT Voice file format D adf Artworx Data Format D adp ADP D ads Sony PSADS E adts ADTS AAC (Advanced Audio Coding) DE adx CRI ADX D aea MD STUDIO audio D afc AFC DE aiff Audio IFFffmpeg -formats | grep mpDE mp MP(MPEG audio layer 3)bsfs命令 所有的比特流过滤器Bitstream filters:aac_adtstoascav1_frame_mergeav1_frame_splitav1_metadatachompdump_extradca_coreeac3_coreextract_extradatafilter_unitsh264_metadatah264_mp4toannexbh264_redundant_ppshapqa_extracthevc_metadatahevc_mp4toannexbimxdumpmjpeg2jpegmjpegadumpmp3decompmpeg2_metadatampeg4_unpack_bframesmov2textsubnoisenullopus_metadatapcm_rechunkprores_metadataremove_extratext2movsubtrace_headerstruehd_corevp9_metadatavp9_raw_reordervp9_superframevp9_superframe_split录制屏幕视频 ffmpeg -f avfoundation -i -r 3out.yuv ffmpeg -f avfoundation -i-r 3-pixel_format yuv420p out.yuv录制音频 ffmpeg -f avfoundation -i :out.wav ffmpeg -f avfoundation -i :-sample_rate 4410-channels out.wav ffmpeg -f avfoundation -i :-ar 4410-ac out.wav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ffmpeg -video_size 2880x180-pixel_format uyvy42out.yuvffmpeg out.wav保留编码格式 ffmpeg -i input.mp-vcodec copy -acodec copy out.flv保留编码格式 ffmpeg -i input.mp-vcodec copy -an outcopy.h264强制格式 ffmpeg -i input.mp-vcodec libx26-an out.h264音视频开发（资料文档+视频教程+面试题）（FFmpeg+WebRTC+RTMP+RTSP+HLS+RTP）保留编码格式 ffmpeg -i input.mp-vn -acodec copy outcopy.aac强制格式 ffmpeg -i input.mp-vn -acodec libmp3lame out.mp3提取像素格式和PCM数据 抽取YUV数据分辨率和源视频一致 ffmpeg -i input.mpout.yuv分辨率转为320x24ffmpeg -i input.mp-video_size 320x24out.yuvffmpeg -i input.mp-pixel_format rgb2out.rgbffmpeg -pixel_format yuv420p -video_size 960x54-i input.yuv -pixel_format rgb2out.rgbffmpeg -i input.mp-vn -ar 4410-ac -f s16le out.pcm播放pcm ffplay -ar 4410-ac -f s16le out.pcmffmpeg -i input.mp-an -vcodec rawvideo -pixel_format yuv420p out.yuvffmpeg -i input.mp-vn -ar 4410-ac -f s16le out.pcm在学滤镜命令之前 我们先了解一下分解与复用过程滤镜实际上是对解码后的数据帧进行滤镜处理 过程如下：ffmpeg -i input.mp-vf crop=in_w-200:in_h-20-c:v libx26-c:a copy out.mpcrop格式： crop=out_w:out_h:x:yffmpeg -i input.mp-ss 00:00:0-t 1out.mp4ffmpeg -f concat -i input.txt out.mp4ffmpeg -i input.mp-r -f imageimage-%3d.jpegffmpeg -i image-%3d.jpeg out.mp4ffmpeg -re -i input.mp-c copy -f flv rtmp://......ffmpeg -i rtmp://.... -c copy out.mp4。