ffmpeg - 抽屉盒 : error when evaluating the expression 'max'

Question

我尝试使用命令:

/usr/bin/ffmpeg -i uploads/14940964561.mp4 -vf "drawbox=x=0:y=0:w=1000:h=1000:color=white@0.2:t=max" uploads/output.mp4

输出错误

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-l
inux-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-lib
freetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-li
brtmp --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-li
bwavpack --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 '14942588091.mp4':
Metadata:
major_brand     : isom
minor_version   : 512
compatible_brands: isomiso2avc1mp41
encoder         : Lavf56.4.101
Duration: 00:00:08.00, start: 0.000000, bitrate: 350 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 347 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
  handler_name    : VideoHandler
[Parsed_drawbox_0 @ 0x856b8e0] [Eval @ 0xbf9ae638] Undefined constant or missing '(' in 'max'
Last message repeated 5 times
[Parsed_drawbox_0 @ 0x856b8e0] Error when evaluating the expression 'max'
[Parsed_drawbox_0 @ 0x856b8e0] Failed to configure input pad on Parsed_drawbox_0
Error opening filters!

这是错误正确的消息。
以前，一条消息和代码是错误的。对不起!

消息错误:

我使用 Ubuntu 32 位，但 Windows 10 中的命令有效。

Answer 1

您的 ffmpeg太旧了。

最简单的升级方法是下载一个最近的、已经编译的版本。见FFmpeg Download Linux、macOS 和 Windows 的链接页面。