向ffprobe/ffmpeg添加“超时”标志会导致其立即失败

Question

如果我运行ffprobe -timeout 20 -v trace -print_format json -show_format -show_streams 'http://www.sample-videos.com/video/mp4/720/big_buck_bunny_720p_2mb.mp4'，即使将超时设置为20秒，该命令也会立即失败，出现Connection timed out错误。它不会等待接近20秒的任何地方，只需退出代码1就立即退出。以下是跟踪输出。

ffprobe version 3.2.2 Copyright (c) 2007-2016 the FFmpeg developers 
    built with gcc 6.2.1 (GCC) 20160830 
    configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avisynth --enable-avresample --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libass --enable-libbluray --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-netcdf --enable-shared --enable-version3 --enable-x11grab 
    libavutil  55. 34.100/55. 34.100 
    libavcodec  57. 64.101/57. 64.101 
    libavformat 57. 56.100/57. 56.100 
    libavdevice 57. 1.100/57. 1.100 
    libavfilter  6. 65.100/6. 65.100 
    libavresample 3. 1. 0/3. 1. 0 
    libswscale  4. 2.100/4. 2.100 
    libswresample 2. 3.100/2. 3.100 
    libpostproc 54. 1.100/54. 1.100 
{ 
[http @ 0x5598e7df1e20] Setting default whitelist 'http,https,tls,rtp,tcp,udp,crypto,httpproxy' 
[http @ 0x5598e7df1e20] request: GET /video/mp4/720/big_buck_bunny_720p_2mb.mp4 HTTP/1.1 
User-Agent: Lavf/57.56.100 
Accept: */* 
Range: bytes=0- 
Connection: close 
Host: www.sample-videos.com 
Icy-MetaData: 1 


http://www.sample-videos.com/video/mp4/720/big_buck_bunny_720p_2mb.mp4: Connection timed out 

} 

如果我删除了-timeout 20标志，该命令正常工作。我怎样才能得到ffprobe以超时工作？

Answer 1

-timeout的单位在每个协议中是不同的。

在HTTP中，单位是微秒。