ffmpeg命令使用
[1].[代码] 截取一张352x240尺寸大小的，格式为jpg的图片 跳至 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
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1
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ffmpeg -i
test
.asf -y -f image2 -t 0.001 -s 352x240 a.jpg
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[2].[代码] 把视频的前30帧转换成一个Animated Gif 跳至 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
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1
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ffmpeg -i
test
.asf -vframes 30 -y -f gif a.gif
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[3].[代码] 截取指定时间的缩微图,-ss后跟的时间单位为秒 跳至 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
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1
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ffmpeg -i
test
.avi -y -f image2 -ss 8 -t 0.001 -s 350x240
test
.jpg
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[4].[代码] 转换文件为3GP格式 跳至 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
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1
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ffmpeg -y -i
test
.mpeg -bitexact -vcodec h263 -b 128 -r 15 -s 176x144 -acodec aac -ac 2 -ar 22500 -ab 24 -f 3gp
test
.3gp
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[5].[代码] 转换文件为3GP格式 v2 跳至 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
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1
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ffmpeg -y -i
test
.wmv -ac 1 -acodec libamr_nb -ar 8000 -ab 12200 -s 176x144 -b 128 -r 15
test
.3gp
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[6].[代码] 如何使用 ffmpeg 编码得到高质量的视频 跳至 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
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1
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ffmpeg.exe -i
"D:\Video\Fearless\Fearless.avi"
-target film-dvd -s 720x352 -padtop 64 -padbottom 64 -maxrate 7350000 -b 3700000 -sc_threshold 1000000000 -trellis -cgop -g 12 -bf 2 -qblur 0.3 -qcomp 0.7 -me full -
dc
10 -mbd 2 -aspect 16:9 -pass 2 -passlogfile
"D:\Video\ffmpegencode"
-an -f mpeg2video
"D:\Fearless.m2v"
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[7].[代码] 转换指定格式文件到FLV格式 跳至 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
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1
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ffmpeg.exe -i
test
.mp3 -ab 56 -ar 22050 -b 500 -r 15 -s 320x240 f:\
test
.flv
ffmpeg.exe -i
test
.wmv -ab 56 -ar 22050 -b 500 -r 15 -s 320x240 f:\
test
.flv
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[8].[代码] 转码解密的VOB 跳至 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
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ffmpeg -i snatch_1.vob -f avi -vcodec mpeg4 -b 800 -g 300 -bf 2 -acodec mp3 -ab 128 snatch.avi
echo
上面的命令行将vob的文件转化成avi文件，mpeg4的视频和mp3的音频。注意命令中使用了B帧，所以mpeg4流是divx5兼容的。GOP大小是300意味着29.97帧频下每10秒就有INTRA帧。该映射在音频语言的DVD转码时候尤其有用。
echo
同时编码到几种格式并且在输入流和输出流之间建立映射
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[9].[代码] 转换wav到mp2格式 跳至 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
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1
2
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ffmpeg -i
/tmp/a
.wav -ab 64
/tmp/a
.mp2 -ab 128
/tmp/b
.mp2 -map 0:0 -map 0:0
echo
上面的命令行转换一个64Kbits 的a.wav到128kbits的a.mp2 ‘-map
file
:index’在输出流的顺序上定义了哪一路输入流是用于每一个输出流的。
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[10].[代码] 转换文件为3GP格式 跳至 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
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1
2
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ffmpeg -i
test
.avi -y -b 20 -s sqcif -r 10 -acodec amr_wb -ab 23.85 -ac 1 -ar 16000
test
.3gp
echo
注：如果要转换为3GP格式，则ffmpeg在编译时必须加上–
enable
-amr_nb –
enable
-amr_wb，详细内容可参考：转换视频为3GPP格式
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[11].[代码] 转换文件为MP4格式（支持iPhone/iTouch） 跳至 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
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ffmpeg -y -i input.wmv -f mp4 -async 1-s 480x320 -acodec libfaac -vcodec libxvid -qscale 7 -dts_delta_threshold 1 output.mp4
ffmpeg -y -i source_video.avi input -acodec libfaac -ab 128000 -vcodec mpeg4 -b 1200000 -mbd 2 -flags +4mv+trell -aic 2 -
cmp
2 -subcmp 2 -s 320x180 -title X final_video.mp4
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[12].[代码] 将一段音频与一段视频混合 跳至 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
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1
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ffmpeg -i son.wav -i video_origine.avi video_finale.mpg
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[13].[代码] 将一段视频转换为DVD格式 跳至 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
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1
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ffmpeg -i source_video.avi -target pal-dvd -
ps
2000000000 -aspect 16:9 finale_video.mpeg
echo
注：target pal-dvd : Output
format
ps
2000000000 maximum size
for
the output
file
,
in
bits (here, 2 Gb) aspect 16:9 : Widescreen
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[14].[代码] 转换一段视频为DivX格式 跳至 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
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1
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ffmpeg -i video_origine.avi -s 320x240 -vcodec msmpeg4v2 video_finale.avi
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[15].[代码] Turn X images to a video sequence 跳至 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
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ffmpeg -f image2 -i image%d.jpg video.mpg
echo
注：This
command
will transform all the images from the current directory (named image1.jpg, image2.jpg, etc...) to a video
file
named video.mpg.
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[16].[代码] Turn a video to X images 跳至 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
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ffmpeg -i video.mpg image%d.jpg
echo
注：This
command
will generate the files named image1.jpg, image2.jpg, ...
echo
The following image formats are also availables : PGM, PPM, PAM, PGMYUV, JPEG, GIF, PNG, TIFF, SGI.
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[17].[代码] 使用ffmpeg录像屏幕(仅限Linux平台) 跳至 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
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ffmpeg -vcodec mpeg4 -b 1000 -r 10 -g 300 -vd x11:0,0 -s 1024x768 ~
/test
.avi
echo
其中，-vd x11:0,0 指录制所使用的偏移为 x=0 和 y=0，-s 1024×768 指录制视频的大小为 1024×768。录制的视频文件为
test
.avi，将保存到用户主目录中
echo
如果你只想录制一个应用程序窗口或者桌面上的一个固定区域，那么可以指定偏移位置和区域大小。使用xwininfo -frame命令可以完成查找上述参数。
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[18].[代码] 重新调整视频尺寸大小(仅限Linux平台) 跳至 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
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1
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ffmpeg -vcodec mpeg4 -b 1000 -r 10 -g 300 -i ~
/test
.avi -s 800×600 ~
/test-800-600
.avi
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[19].[代码] 把摄像头的实时视频录制下来，存储为文件(仅限Linux平台) 跳至 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
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1
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ffmpeg -f video4linux -s 320*240 -r 10 -i
/dev/video0
test
.asf
echo
更多信息可参考ffmpeg工程组论坛的讨论贴：有关ffmpeg的视频采集
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[20].[代码] 使用ffmpeg压制H.264视频 跳至 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
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ffmpeg -threads 4 -i INPUT -r 29.97 -vcodec libx264 -s 480x272 -flags +loop -
cmp
chroma -deblockalpha 0 -deblockbeta 0 -crf 24 -bt 256k -refs 1 -coder 0 -me umh -me_range 16 -subq 5 -partitions parti4x4+parti8x8+partp8x8 -g 250 -keyint_min 25 -level 30 -qmin 10 -qmax 51 -trellis 2 -sc_threshold 40 -i_qfactor 0.71 -acodec libfaac -ab 128k -ar 48000 -ac 2 OUTPUT
echo
注：使用该指令可以压缩出比较清晰，而且文件转小的H.264视频文件
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