在Ubuntu中使用ffmpeg提取視頻的時間

Question

我使用的是Ubuntu 14.04.5 LTS 32位和ffmpeg來提取視頻的時間。

在Windows 10的命令作品：

/usr/bin/ffmpeg -i video.mp4 -vstats 2> & 1 

在Linux中的ffmpeg返回錯誤紅色：必須指定

至少一個輸出文件

錯誤完全是在這裏：

ffmpeg version 2.4.3-1ubuntu1~trusty6 Copyright (c) 2000-2014 the FFmpeg developers 
built on Nov 22 2014 17:07:19 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1) 
configuration: --prefix=/usr --extra-version='1ubuntu1~trusty6' --build-suffix=-ffmpeg --toolchain=hardened 
--extra-cflags= --extra-cxxflags= --libdir=/usr/lib/i386-linux-gnu --shlibdir=/usr/lib/i386-linux-gnu --incdir=/ 
usr/include/i386-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample 
--enable-avisynth --enable-fontconfig --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray 
--enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfreetype --enable-libfribidi 
--enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus 
--enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libssh 
--enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp 
--enable-opengl --enable-x11grab --enable-libxvid --enable-libx265 --enable-libdc1394 --enable-libiec61883 
--enable-libzvbi --enable-libzmq --enable-frei0r --enable-libx264 --enable-libsoxr --enable-openal 
--enable-libopencv 
libavutil  54. 7.100/54. 7.100 
libavcodec  56. 1.100/56. 1.100 
libavformat 56. 4.101/56. 4.101 
libavdevice 56. 0.100/56. 0.100 
libavfilter  5. 1.100/5. 1.100 
libavresample 2. 1. 0/2. 1. 0 
libswscale  3. 0.100/3. 0.100 
libswresample 1. 1.100/1. 1.100 
libpostproc 53. 0.100/53. 0.100 
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4': 
Metadata: 
major_brand  : mp42 
minor_version : 0 
compatible_brands: mp41isom 
creation_time : 2017-01-29 15:42:02 
location  : -21.6646-46.7394/ 
location-eng : -21.6646-46.7394/ 
Duration: 00:01:49.43, start: 0.000000, bitrate: 1171 kb/s 
Stream #0:0(und): Video: h264 (Main) (avc1/0x31637661), yuv420p(tv), 640x360 [SAR 1:1 DAR 16:9], 992 kb/s, 
15.01 fps, 15 tbr, 30k tbn, 60 tbc (default) 
Metadata: 
    creation_time : 2017-01-29 15:42:02 
    handler_name : VideoHandler 
    encoder   : AVC Coding 
Stream #0:1(und): Audio: aac (mp4a/0x6134706D), 48000 Hz, stereo, fltp, 174 kb/s (default) 
Metadata: 
    creation_time : 2017-01-29 15:42:02 
    handler_name : SoundHandler 
At least one output file must be specified 

我該如何解決這個問題？

Answer 1

使用

/usr/bin/ffmpeg -i video.mp4 -vstats -map 0:v -f null - 2>&1 

或者你可以只使用ffprobe

ffprobe -show_entries format=duration -of compact=p=0:nk=1 video.mp4