Edited at

FFmpegコマンドメモ

More than 1 year has passed since last update.

随時追加予定

動画の変換

ffmpeg -i a.mp4 -b:v 8000k -ab 128k -ar 48000 b.mp4

Input a.mp4

Output b.mp4

動画のビットレート 8000k

音声のビットレート 128k

サンプリングレート 48k

試しに使えそうな動画データセット

American Sign Language Lexicon Video Dataset (ASLLVD)

http://vlm1.uta.edu/~athitsos/asl_lexicon/



$ ffmpeg -i scene1-camera1.mov

ffmpeg version 2.7.1 Copyright (c) 2000-2015 the FFmpeg developers

built with Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)

configuration: --prefix=/usr/local/Cellar/ffmpeg/2.7.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-vda

libavutil 54. 27.100 / 54. 27.100

libavcodec 56. 41.100 / 56. 41.100

libavformat 56. 36.100 / 56. 36.100

libavdevice 56. 4.100 / 56. 4.100

libavfilter 5. 16.101 / 5. 16.101

libavresample 2. 1. 0 / 2. 1. 0

libswscale 3. 1.101 / 3. 1.101

libswresample 1. 2.100 / 1. 2.100

libpostproc 53. 3.100 / 53. 3.100

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'scene1-camera1.mov':

Metadata:

creation_time : 2008-03-26 03:32:27

Duration: 00:00:33.93, start: 0.000000, bitrate: 4515 kb/s

Stream #0:0(eng): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 4512 kb/s, 60 fps, 60 tbr, 120k tbn, 25 tbc (default)

Metadata:

creation_time : 2008-03-26 03:32:27

handler_name : 3ivx MPEG-4 Alias Data Handler

encoder : 3ivx MPEG-4 5.0.2

At least one output file must be specified

=====================

$ ffmpeg -i scene1-camera1.mov -an -f image2 -vf fps=fps=60 -qscale 1 -qmin 1 -qmax 1 img_%06d.png

ffmpeg version 2.7.1 Copyright (c) 2000-2015 the FFmpeg developers

built with Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)

configuration: --prefix=/usr/local/Cellar/ffmpeg/2.7.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-vda

libavutil 54. 27.100 / 54. 27.100

libavcodec 56. 41.100 / 56. 41.100

libavformat 56. 36.100 / 56. 36.100

libavdevice 56. 4.100 / 56. 4.100

libavfilter 5. 16.101 / 5. 16.101

libavresample 2. 1. 0 / 2. 1. 0

libswscale 3. 1.101 / 3. 1.101

libswresample 1. 2.100 / 1. 2.100

libpostproc 53. 3.100 / 53. 3.100

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'scene1-camera1.mov':

Metadata:

creation_time : 2008-03-26 03:32:27

Duration: 00:00:33.93, start: 0.000000, bitrate: 4515 kb/s

Stream #0:0(eng): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 4512 kb/s, 60 fps, 60 tbr, 120k tbn, 25 tbc (default)

Metadata:

creation_time : 2008-03-26 03:32:27

handler_name : 3ivx MPEG-4 Alias Data Handler

encoder : 3ivx MPEG-4 5.0.2

Please use -q:a or -q:v, -qscale is ambiguous

Output #0, image2, to 'img_%06d.png':

Metadata:

encoder : Lavf56.36.100

Stream #0:0(eng): Video: png, rgb24, 640x480 [SAR 1:1 DAR 4:3], q=1-1, 200 kb/s, 60 fps, 60 tbn, 60 tbc (default)

Metadata:

creation_time : 2008-03-26 03:32:27

handler_name : 3ivx MPEG-4 Alias Data Handler

encoder : Lavc56.41.100 png

Stream mapping:

Stream #0:0 -> #0:0 (mpeg4 (native) -> png (native))

Press [q] to stop, [?] for help

frame= 2036 fps=129 q=0.0 Lsize=N/A time=00:00:33.93 bitrate=N/A


video:291046kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown