ffmpeg使用说明(2)：ffmpeg提取video，audio，yuv/rgb，PCM
提取视频
保留封装格式
ffmpeg -i cctv1.flv -an -vcodec copy cctv1_copy.flv
$ ffprobe cctv1.flv
Input #0, flv, from 'cctv1.flv':
Metadata:
encoder : Lavf58.20.100
Duration: 00:00:23.69, start: 0.000000, bitrate: 1793 kb/s
Stream #0:0: Audio: mp3, 48000 Hz, stereo, fltp, 128 kb/s
Stream #0:1: Video: flv1, yuv420p, 1920x1080, 200 kb/s, 25 fps, 25 tbr, 1k tbn
$ ffmpeg -i cctv1.flv -an -vcodec copy cctv1_copy.flv
$ ffprobe cctv1_copy.flv
Input #0, flv, from 'cctv1_copy.flv':
Metadata:
encoder : Lavf58.29.100
Duration: 00:00:23.40, start: 0.103000, bitrate: 1733 kb/s
Stream #0:0: Video: flv1, yuv420p, 1920x1080, 200 kb/s, 25 fps, 25 tbr, 1k tbn
转换封装格式
ffmpeg -i cctv1.flv -vcodec libx264 -an cctv1.h264
$ ffprobe cctv1.flv
Input #0, flv, from 'cctv1.flv':
Metadata:
encoder : Lavf58.20.100
Duration: 00:00:23.69, start: 0.000000, bitrate: 1793 kb/s
Stream #0:0: Audio: mp3, 48000 Hz, stereo, fltp, 128 kb/s
Stream #0:1: Video: flv1, yuv420p, 1920x1080, 200 kb/s, 25 fps, 25 tbr, 1k tbn
$ ffmpeg -i cctv1.flv -vcodec libx264 -an cctv1.h264
$ ffprobe cctv1.h264
Input #0, h264, from 'cctv1.h264':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: h264 (High), yuv420p(progressive), 1920x1080, 25 fps, 25 tbr, 1200k tbn, 50 tbc
是否需要转码的差异在于-vcodec copy 还是-vcodec codec_name
提取音频
保留封装格式
ffmpeg -i cctv1.flv -vn -acodec libmp3lame test.mp3
ffmpeg -i cctv1.flv -vn cctv1.mp3
$ ffprobe cctv1.flv
Input #0, flv, from 'cctv1.flv':
Metadata:
encoder : Lavf58.20.100
Duration: 00:00:23.69, start: 0.000000, bitrate: 1793 kb/s
Stream #0:0: Audio: mp3, 48000 Hz, stereo, fltp, 128 kb/s
Stream #0:1: Video: flv1, yuv420p, 1920x1080, 200 kb/s, 25 fps, 25 tbr, 1k tbn
$ ffmpeg -i cctv1.flv -vn cctv1.mp3
$ ffprobe cctv1.mp3
Input #0, mp3, from 'cctv1.mp3':
Metadata:
encoder : Lavf58.29.100
Duration: 00:00:14.54, start: 0.023021, bitrate: 128 kb/s
Stream #0:0: Audio: mp3, 48000 Hz, stereo, fltp, 128 kb/s
Metadata:
encoder : Lavc58.54
转换封装格式
$ ffmpeg -i cctv1.flv -vn -acodec aac cctv1.aac
$ ffprobe cctv1.flv
Input #0, flv, from 'cctv1.flv':
Metadata:
encoder : Lavf58.20.100
Duration: 00:00:23.69, start: 0.000000, bitrate: 1793 kb/s
Stream #0:0: Audio: mp3, 48000 Hz, stereo, fltp, 128 kb/s
Stream #0:1: Video: flv1, yuv420p, 1920x1080, 200 kb/s, 25 fps, 25 tbr, 1k tbn
$ ffmpeg -i cctv1.flv -vn -acodec aac cctv1.aac
$ ffprobe cctv1.aac
Input #0, aac, from 'cctv1.aac':
Duration: 00:00:14.10, bitrate: 135 kb/s
Stream #0:0: Audio: aac (LC), 48000 Hz, stereo, fltp, 135 kb/s
是否需要转码的差异在于-acodec copy 还是-acodec codec_name
提取yuv
支持的yuv格式汇总
IO... yuv420p 3 12
IO... yuv422p 3 16
IO... yuv444p 3 24
IO... yuv410p 3 9
IO... yuv411p 3 12
IO... yuvj420p 3 12
IO... yuvj422p 3 16
IO... yuvj444p 3 24
IO... yuv440p 3 16
IO... yuvj440p 3 16
IO... yuva420p 4 20
IO... yuv420p16le 3 24
IO... yuv420p16be 3 24
IO... yuv422p16le 3 32
IO... yuv422p16be 3 32
IO... yuv444p16le 3 48
IO... yuv444p16be 3 48
IO... yuv420p9be 3 13
IO... yuv420p9le 3 13
IO... yuv420p10be 3 15
IO... yuv420p10le 3 15
IO... yuv422p10be 3 20
IO... yuv422p10le 3 20
IO... yuv444p9be 3 27
IO... yuv444p9le 3 27
IO... yuv444p10be 3 30
IO... yuv444p10le 3 30
IO... yuv422p9be 3 18
IO... yuv422p9le 3 18
IO... yuva422p 4 24
IO... yuva444p 4 32
IO... yuva420p9be 4 22
IO... yuva420p9le 4 22
IO... yuva422p9be 4 27
IO... yuva422p9le 4 27
IO... yuva444p9be 4 36
IO... yuva444p9le 4 36
IO... yuva420p10be 4 25
IO... yuva420p10le 4 25
IO... yuva422p10be 4 30
IO... yuva422p10le 4 30
IO... yuva444p10be 4 40
IO... yuva444p10le 4 40
IO... yuva420p16be 4 40
IO... yuva420p16le 4 40
IO... yuva422p16be 4 48
IO... yuva422p16le 4 48
IO... yuva444p16be 4 64
IO... yuva444p16le 4 64
IO... yuv420p12be 3 18
IO... yuv420p12le 3 18
IO... yuv420p14be 3 21
IO... yuv420p14le 3 21
IO... yuv422p12be 3 24
IO... yuv422p12le 3 24
IO... yuv422p14be 3 28
IO... yuv422p14le 3 28
IO... yuv444p12be 3 36
IO... yuv444p12le 3 36
IO... yuv444p14be 3 42
IO... yuv444p14le 3 42
IO... yuvj411p 3 12
IO... yuv440p10le 3 20
IO... yuv440p10be 3 20
IO... yuv440p12le 3 24
IO... yuv440p12be 3 24
IO... yuva422p12be 4 36
IO... yuva422p12le 4 36
IO... yuva444p12be 4 48
IO... yuva444p12le 4 48
不改变参数
ffmpeg -i cctv1.flv -pix_fmt yuv420p -t 40ms 1920x1080_yuv420p_cctv1.yuv
Input #0, flv, from 'cctv1.flv':
Metadata:
encoder : Lavf58.20.100
Duration: 00:00:23.69, start: 0.000000, bitrate: 1793 kb/s
Stream #0:0: Audio: mp3, 48000 Hz, stereo, fltp, 128 kb/s
Stream #0:1: Video: flv1, yuv420p, 1920x1080, 200 kb/s, 25 fps, 25 tbr, 1k tbn
File '1920x1080_yuv420p_cctv1.yuv' already exists. Overwrite ? [y/N] y
Stream mapping:
Stream #0:1 -> #0:0 (flv1 (flv) -> rawvideo (native))
Press [q] to stop, [?] for help
Output #0, rawvideo, to '1920x1080_yuv420p_cctv1.yuv':
Metadata:
encoder : Lavf58.29.100
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1920x1080, q=2-31, 622080 kb/s, 25 fps, 25 tbn, 25 tbc
Metadata:
encoder : Lavc58.54.100 rawvideo
frame= 1 fps=0.0 q=-0.0 Lsize= 3038kB time=00:00:00.04 bitrate=622080.0kbits/s dup=3 drop=0 speed=1.93x
video:3038kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
改变参数
ffmpeg -i cctv1.flv -pix_fmt yuv420p -t 3 -s 320x240 320x240_yuv420p.yuv
Input #0, flv, from 'cctv1.flv':
Metadata:
encoder : Lavf58.20.100
Duration: 00:00:23.69, start: 0.000000, bitrate: 1793 kb/s
Stream #0:0: Audio: mp3, 48000 Hz, stereo, fltp, 128 kb/s
Stream #0:1: Video: flv1, yuv420p, 1920x1080, 200 kb/s, 25 fps, 25 tbr, 1k tbn
Stream mapping:
Stream #0:1 -> #0:0 (flv1 (flv) -> rawvideo (native))
Press [q] to stop, [?] for help
Output #0, rawvideo, to '320x240_yuv420p.yuv':
Metadata:
encoder : Lavf58.29.100
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 320x240, q=2-31, 23040 kb/s, 25 fps, 25 tbn, 25 tbc
Metadata:
encoder : Lavc58.54.100 rawvideo
frame= 75 fps=0.0 q=-0.0 Lsize= 8438kB time=00:00:03.00 bitrate=23040.0kbits/s dup=3 drop=0 speed=9.82x
video:8438kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
提取rgb
判断支持rgb的像素格式
IO... rgb24 3 24
IO... rgb8 3 8
.O..B rgb4 3 4
IO... rgb4_byte 3 4
IO... rgba 4 32
IO... rgb48be 3 48
IO... rgb48le 3 48
IO... rgb565be 3 16
IO... rgb565le 3 16
IO... rgb555be 3 15
IO... rgb555le 3 15
IO... rgb444le 3 12
IO... rgb444be 3 12
IO... rgba64be 4 64
IO... rgba64le 4 64
IO... rgb0 3 24
$ ffmpeg -i cctv1.flv -pix_fmt rgb24 -s 1080x720 -t 40ms 1080x720_rgb24.rgb
Input #0, flv, from 'cctv1.flv':
Metadata:
encoder : Lavf58.20.100
Duration: 00:00:23.69, start: 0.000000, bitrate: 1793 kb/s
Stream #0:0: Audio: mp3, 48000 Hz, stereo, fltp, 128 kb/s
Stream #0:1: Video: flv1, yuv420p, 1920x1080, 200 kb/s, 25 fps, 25 tbr, 1k tbn
File '1080x720_rgb24.rgb' already exists. Overwrite ? [y/N] y
Stream mapping:
Stream #0:1 -> #0:0 (flv1 (flv) -> rawvideo (native))
Press [q] to stop, [?] for help
Output #0, rawvideo, to '1080x720_rgb24.rgb':
Metadata:
encoder : Lavf58.29.100
Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 1080x720, q=2-31, 466560 kb/s, 25 fps, 25 tbn, 25 tbc
Metadata:
encoder : Lavc58.54.100 rawvideo
frame= 1 fps=0.0 q=-0.0 Lsize= 2278kB time=00:00:00.04 bitrate=466560.0kbits/s dup=3 drop=0 speed= 1.8x
video:2278kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
yuv与rgb互转
$ ffmpeg -video_size 1280x720 -pix_fmt yuv420p -i 1280x720_yuv420p.yuv -pix_fmt rgb24 -t 40ms 1280x720_rgb24.rgb
Input #0, rawvideo, from '1280x720_yuv420p.yuv':
Duration: 00:00:06.76, start: 0.000000, bitrate: 276071 kb/s
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1280x720, 276480 kb/s, 25 tbr, 25 tbn, 25 tbc
File '1280x720_rgb24.rgb' already exists. Overwrite ? [y/N] y
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
Press [q] to stop, [?] for help
Output #0, rawvideo, to '1280x720_rgb24.rgb':
Metadata:
encoder : Lavf58.29.100
Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 1280x720, q=2-31, 552960 kb/s, 25 fps, 25 tbn, 25 tbc
Metadata:
encoder : Lavc58.54.100 rawvideo
frame= 1 fps=0.0 q=-0.0 Lsize= 2700kB time=00:00:00.04 bitrate=552960.0kbits/s speed=1.23x
video:2700kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
$ ffmpeg -video_size 1280x720 -pix_fmt rgb24 -i 1280x720_rgb24.rgb -pix_fmt yuv420p -t 40ms -s 320x240 320x240_yuv420p.yuv
Input #0, rawvideo, from '1280x720_rgb24.rgb':
Duration: 00:00:00.04, start: 0.000000, bitrate: 552960 kb/s
Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 1280x720, 552960 kb/s, 25 tbr, 25 tbn, 25 tbc
File '320x240_yuv420p.yuv' already exists. Overwrite ? [y/N] y
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
Press [q] to stop, [?] for help
Output #0, rawvideo, to '320x240_yuv420p.yuv':
Metadata:
encoder : Lavf58.29.100
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 320x240, q=2-31, 23040 kb/s, 25 fps, 25 tbn, 25 tbc
Metadata:
encoder : Lavc58.54.100 rawvideo
frame= 1 fps=0.0 q=-0.0 Lsize= 112kB time=00:00:00.04 bitrate=23040.0kbits/s speed= 2.2x
video:112kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
提取pcm
$ ffmpeg -i cctv1.aac -ar 48000 -ac 2 -f s16le 48000_2_s16le.pcm
Input #0, aac, from 'cctv1.aac':
Duration: 00:00:14.10, bitrate: 135 kb/s
Stream #0:0: Audio: aac (LC), 48000 Hz, stereo, fltp, 135 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (aac (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, s16le, to '48000_2_s16le.pcm':
Metadata:
encoder : Lavf58.29.100
Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Metadata:
encoder : Lavc58.54.100 pcm_s16le
size= 2728kB time=00:00:14.54 bitrate=1536.0kbits/s speed= 524x
video:0kB audio:2728kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
本文来自博客园，作者：flxx，转载请注明原文链接：https://www.cnblogs.com/faithlocus/p/15520037.html
