Can someone make me a ffmpeg file for normalizing mp4 files? I am Clueless.

[xrayengineer]

Hello, I use Handbrake to make videos for watching on my nookcolor, however the audio levels of the movies are too low. I know that ffmpeg can take care of this, but i cannot figure out the script.

If possible, I would like to take a completed, h.264 with AAC audio mp4 file, and "run" ffmpeg on it to "boost" the volume . I don't know what % of a boost it would need, but perhaps 45% increase would be a rough guess.

Can anyone offer any help? I would use this program on a Windows 7 box.

Thank you!

[bat999]

Hi
To change the volume there's an option '-vol'.
By default it's 256 so if you use 512 it will increase.

Your command could be something like this:-

ffmpeg -i movie.mp4 -vcodec copy -acodec libfaac -ab 128K -vol 512 output.mp4

That would keep the video track unchanged, and the audio will be aac at 128Kbps with an increase in volume.
Test it with a short clip first, see what it sounds like. Change the bitrate if you like too.

[xrayengineer]

Bat999 :

Thanks! I had to use FFE instead of the strict command line, because I am running this on a standard Windows 7 box. After I stumbled around to get the settings to match your line it worked perfect!

The 512 volume number was perfect as well.

thank you for the information!