如何通过ssh在远程机器上使用ffmpeg

问题描述

我的LAN上有三台电脑，

I have three computers on my LAN,

一个运行ubuntu ，

一个运行 openSuse

和我的服务器运行Archlinux 。

one running ubuntu,
one running openSuse
and my server running Archlinux.

我只设法得到 ffmpeg 在我的服务器上正常工作。

I've only managed to get ffmpeg to work properly on my server.

我想编写一个脚本，假装是一个 ffmpeg 安装本地机器，但实际上只是使用服务器的 ffmpeg 。

I would like to write a script that would pretend to be an ffmpeg installation on the local machine, but would actually just be using the server's ffmpeg.

示例：

ffmpeg -i file.avi out.flv

然后按照预期的方式获取正常输出，

但我想要在archlinux上使用ffmpeg。

and then get the normal output as one would expect,
but I want it to use the ffmpeg on the archlinux.

有关我如何让这个工作的任何建议。

（最好在Ruby中）

any advice as to how I would get this to work.
( preferably in Ruby )

编辑：我把这个问题扩展到了

I've extended this question to How do I display progress bars from a shell command over ssh

推荐答案

我没有很多红宝石，但这似乎很有效！

I don't have a lot of ruby-fu, but this seems to work!

先决条件，

sudo yum install rubygems
sudo gem install net-ssh net-sftp highline echoe

代码（含评论），

#!/usr/bin/env ruby

require 'rubygems'
require 'net/ssh'
require 'net/sftp'
require 'highline/import'

file = ARGV[ 0 ]                  # filename from command line
prod = file + "-new"              # product filename (call it <file>-new)
rpath = "/tmp"                    # remote computer operating directory
rfile = "#{rpath}/#{file}"        # remote filename
rprod = "#{rpath}/#{prod}"        # remote product
cmd  = "mv #{rfile} #{rprod}"     # remote command, constructed

host = "-YOUR REMOTE HOST-"
user = "-YOUR REMOTE USERNAME-"
pass = ask("Password: ") { |q| q.echo = false }  # password from stdin

Net::SSH.start(host, user, :password => pass) do |ssh|
        ssh.sftp.connect do |sftp|
                # upload local 'file' to remote 'rfile'
                sftp.upload!(file, rfile)

                # run remote command 'cmd' to produce 'rprod'
                ssh.exec!(cmd)

                # download remote 'rprod' to local 'prod'
                sftp.download!(rprod, prod)
        end
end

然后我可以这样运行，

dylan@home ~/tmp/ruby) ls
bar  remotefoo.rb*
dylan@home ~/tmp/ruby) ./remotefoo.rb bar
Password:
dylan@home ~/tmp/ruby) ls
bar  bar-new  remotefoo.rb*

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