Extract Audio from RM File without Convert it

[Bruno AUgusto]

Hi all,

This is my first post here, and I think it's the right place for such question.

The subject explains what I want to do by itself.

My final goal is to create a Video File with the Video from an HD FLV Source and the Audio from this file (dubbed).

I tried several apps to do the task because my knowledge is kind of limited about the process.

All the tries resulted in MP3 files with a mild wheezing not present (or not so perceptible) in the original RM File.

I thought it could be problem of excessive decibels and, using MP3Gain I figured out the files was with 98 dB. I lowered it to "normal" (89 dB) and the wheezing decreased, but I still can hear it.

Maybe something in the conversion RM ---> MP3 screwed up, I don't know...

[OFFTOPIC]

Who should I talk with to fix a nickname mistake. In my last name, there is mistyped uppercased 'U'.

[bat999]

and the Audio from this file (dubbed).
.

Use a program such as mediainfo to show what's in the RM file and post the result here.

[Bruno AUgusto]

If I exported correctly, here is the requested data:

General
Complete name                    : C:\Users\Usuário\Desktop\Vid1.rm
Format                           : RealMedia
File size                        : 60.4 MiB
Duration                         : 19mn 46s
Overall bit rate                 : 413 Kbps

Video
ID                               : 1
Format                           : RealVideo 4
Codec ID                         : RV40
Codec ID/Info                    : Based on AVC (H.264), Real Player 9
Duration                         : 19mn 46s
Bit rate                         : 349 Kbps
Width                            : 640 pixels
Height                           : 480 pixels
Display aspect ratio             : 4:3
Frame rate                       : 23.976 fps
Bits/(Pixel*Frame)               : 0.047
Stream size                      : 49.4 MiB (82%)

Audio
ID                               : 0
Format                           : Cooker
Codec ID                         : cook
Codec ID/Info                    : Based on G.722.1, Real Player 6
Duration                         : 19mn 47s
Bit rate                         : 64.1 Kbps
Channel(s)                       : 2 channels
Sampling rate                    : 44.1 KHz
Bit depth                        : 16 bits
Stream size                      : 9.07 MiB (15%)

[bat999]

...

[Ai Haibara]

I used to have a utility, that I can't remember the name of at the moment, that 'extracted' (probably converted) the audio in an .rm to .wav... if I remember correctly. I'll see if I can find it again. Don't ffmpeg and mencoder both have support for the older Real codecs, though?

Edit: Websearches have turned up what I think is a console (CLI) utility, ra2wav (although that's not what I remember using). You might also be able to use Tinra to convert the video and extract the video from the converted version, but I'm not sure you won't run into issues with that - like FLV, Real formats tend to be somewhat highly compressed, so the audio and video quality often suffer - and converting to other formats afterward may not help.

[Bruno AUgusto]

Well, in one of my tries, I stumbled upon Pazera Free Audio Extractor. With this program I found an option under Output Format called Try extract original audio stream.

The result file was a WAV File fo 199 MB.

However, I have two questions about the process:

1. The program has several files, but only TWO executables: The main program (GUI) and ffmpeg.exe.
   With this, I'm supposing it uses ffmpeg to do the task, just like Ai Haibara said.
   
   What is the command line to the this task without the GUI?
   
2. The source RM Video File has near of 60 MB. Why the result audio file is more than 3x large?

[EDIT]

Well, everytime we we're happy with something working well, something else comes to screw up.

Honestly, I should be warned about this...

Anyway... The dubbed audio was extracted, but if compared to HD Video, it's not synchronized. Is there any way to change audio speed using something from Video Source?

I don't know, retrieve some information about original audio (english) and then apply it to dubbed audio, increasing or lowering its speed, in order to synchronize automatically?

[davexnet]

Perhaps the audio editor Audacity, has time stretch functions.

[Bruno AUgusto]

And how exactly this feature would work? I was thinking something less manual, like input the correct video, the wrong audio and something "mathemagically" help to fix.