Comments on: Encoding media files in Ruby using ffmpeg/mencoder with progress tracking

By: Lele

Lele — Mon, 23 Jun 2008 13:25:13 +0000

Hi,
I’m trying to do something similar to what you did.
One thing I’m trying to add now is a timeout, what I would like to do is to check if I get some output from mencoder, if I don’t get any output on the stdour or error for more that 30 sec I want to quit the process.
Is that possible?
thanks very much in advance

By: Chris

Chris — Sun, 22 Jun 2008 16:35:38 +0000

The ffmpeg progress counter will never update with Ruby 1.8.6 because duration is defined out of scope (the first if clause) when processing each line from ffmpeg’s output (the second if clause) — to fix it, change the line: “progress = nil” to “duration = progress = nil” and it will work fine.

By: benok

benok — Sat, 16 Feb 2008 00:56:20 +0000

Hi, do you know this library?
It’s very handy.
http://0xcc.net/ruby-progressbar/index.html.en

By: Adam

Adam — Tue, 22 Jan 2008 22:20:24 +0000

Hi , Thanks for this tutorial.
I am on leopard FFmpeg version SVN-r9102, ruby 1.8.6.
The above code works fine for me but the progress wont update sequentially as expected.

Any idea what this could be?? Is it something to do with pipe.each(“\r”) ??

By: Руслан Разбежкин

Руслан Разбежкин — Fri, 14 Dec 2007 09:59:37 +0000

Помогите решить вот такую проблему:
конвертирую flv в mov
на входе 8 Мб
на выходе 51 Мб, т.е. в 6 раз больше.

команда такая:
ffmpeg -i sqlintro1.flv -sameq 01sql.mov

Подскажите, если не затруднит, какими ключами можно уменьшить размер выходного файла, чтобы он был примерно таким же как и входной.

By: links, ideas and geek stuff » Blog Archive » links for 2007-10-19

links, ideas and geek stuff » Blog Archive » links for 2007-10-19 — Fri, 19 Oct 2007 00:44:59 +0000

[…] Encoding media files in Ruby using ffmpeg/mencoder with progress tracking […]

By: Converting movies to flv format. « nuby on rails

Converting movies to flv format. « nuby on rails — Sun, 19 Aug 2007 20:48:03 +0000

[…] going with a different guide […]

By: Baerz

Baerz — Tue, 19 Jun 2007 09:41:33 +0000

Hey, works :) Thanks…

By: Dmytro Shteflyuk

Dmytro Shteflyuk — Tue, 19 Jun 2007 09:28:07 +0000

Baerz, you should define methods execute_mencoder and execute_ffmpeg before executing them, for example, right after definition of the class MediaFormatException.

By: Baerz

Baerz — Tue, 19 Jun 2007 09:20:55 +0000

Hi, i tried to implement your Script, but it will not work for me. I get an Error: undefined method `execute_mencoder’ for main:Object (NoMethodError)

Why? :)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57

class MediaFormatException < StandardError
end

command_mencoder = "/usr/bin/mencoder /home/download/medien_trailer.mov -o /home/robin/download/output.avi -oac lavc -ovc lavc -lavcopts vcodec=xvid:acodec=mp3"
command_ffmpeg = "/usr/bin/ffmpeg -y -i /home/download/medien_trailer.mov -vcodec xvid -acodec mp3 -ab 96 /home/robin/download/output.avi 2>&1"

begin
execute_mencoder(command_mencoder)
execute_ffmpeg(command_ffmpeg)
rescue
print "ERROR\n"
exit 1
end

def execute_mencoder(command)
progress = nil
Open3.popen3(command) do |pipe|
pipe.each("\r") do |line|
if line =~ /Pos:[^(]*(\s*(\d+)%)/
p = $1.to_i
p = 100 if p > 100
if progress != p
progress = p
print "PROGRESS: #{progress}\n"
$defout.flush
end
end
end
end
raise MediaFormatException if $?.exitstatus != 0
end

def execute_ffmpeg(command)
progress = nil
Open3.popen3(command) do |pipe|
pipe.each("\r") do |line|
if line =~ /Duration: (\d{2}):(\d{2}):(\d{2}).(\d{1})/
duration = (($1.to_i * 60 + $2.to_i) * 60 + $3.to_i) * 10 + $4.to_i
end
if line =~ /time=(\d+).(\d+)/
if not duration.nil? and duration != 0
p = ($1.to_i * 10 + $2.to_i) * 100 / duration
else
p = 0
end
p = 100 if p > 100
if progress != p
progress = p
print "PROGRESS: #{progress}\n"
$defout.flush
end
end
end
end
raise MediaFormatException if $?.exitstatus != 0
end