Amplifying Audio Stream in Video

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Amplifying Audio Stream in Video

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Trom

Member

18. January 2006 @ 06:36

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From time to time when I need to up the volume of an mp3 I can load the file into CoolEditPro and amplify the file by up to 10db. I am now looking for a way to do this with the audio stream from a video file(.mp4). I know I can rip the audio file from the Video file but its the process of joining both up together again so they are in sync that bothers me. Can someone give me some pointers regarding the software and steps I need to take to achieve this.

The reason I want to do this is when I rip a DVD with NeroRecode2 to an mp4 file for the PSP the volume is very low, as it is with most apps that do this job. I would like to be able to amplify the audio stream before I put the file on the PSP.

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rp_024

Suspended permanently

18. January 2006 @ 09:47

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I've heard a lot of hype with avisynth

http://www.avisynth.org/

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HP A350N P4 2.8ghz 180gig hd with 1.5gig PC3200 DDR ram. Plextor 712a DVD-R,CD-R,Rom w/Buffer underrun and lossless technology, Media Ritek DVD-R

celtic_d

AfterDawn Addict

18. January 2006 @ 18:53

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For mp3 you really ought to check out mp3gain. That way you can increase volume without re-encoding.

For mp4, I would suggest that you try aacgain. Same principle basically as mp3gain. Pretty sure that it supports the mp4 container, although you might need to Demux to an audio only mp4 first.

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paxophile

Newbie

2. February 2006 @ 22:57

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mp4s are not muxed like a mpeg1 or mpeg2 file. An mp4 is a container where audio and
video tracks are laid out much like Quicktime .mov files. In fact, mp4s were modelled after
Quicktime.

Having said that, it would be really nice if a developer could take the extra step to modify
iVolume or AACgain to work with .mov and .m4v (.mp4) files. It would be as simple as getting
the app to ignore the video track(s) in the container, since the data is NOT muxed. There has
got to be a growing need for this with the popularity of the iPod video (and iTunes working
with videos now).

Is someone listening... PLEASE?! I have been waiting for this for 2 years now. I have over 2000
music videos in .mp4 and .mov that need this functionality!

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This message has been edited since posting. Last time this message was edited on 2. February 2006 @ 22:58

celtic_d

AfterDawn Addict

3. February 2006 @ 04:51

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As long as it remuxes the mov to mp4 I guess it would be ok. aacgain is opensource if you want to take a look at it.

Hmmm, sf cvs seems to be down, but it should be: http://cvs.sourceforge.net/viewcvs.py/mp3gain/aacgain

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