Raise volume on an Mp4

[tahuhali]

I have a large Mp4 file that has very, very low volume whenever played. I have spent about 2 hours searching for a good tool to increase the gain with no results. the only one i found and tried was Avidemux 2.6, and it didn't work as expected. anyone know something i can use without re-encoding the whole file?

[ozok]

You can do it by seperatly encoding audio while not touching the video.
1) Download beta_2307 from https://bitbucket.org/ozok/taudioconverter-audio-converter/downloads (only in beta version this func works)
2) Add your video file to the list.
3) Set codec, bitrate etc.
3.1) Make sure "Method" is "Encode Audio"
4) Click to "Filters" button. Check "Change volume" and set value in percentage. Start encoding.
5) If it all goes well, you'll have an m4a file in output folder. You can then mux this audio stream with video using a mp4box GUI or mp4box itself.

[Nologic]

May I suggest trying VideoGain course there are a few other app's on the forums that do much the same thing.

However it will re-encode your audio stream...but not your video stream....well unless you select re-encode for H264...and your video stream isn't H264. If it's already H264 even if re-encode is selected it won't encode the video stream.

[redwudz]

One possible problem. If the audio is at a very low level and if you just boost it, you may also boost all the noise.
If you do make major changes, do it on a copy of the original or just use a small sample of the original for experimenting with, so you don't damage the original.

If you need a more 'in depth' audio editor, try the freeware Audacity or something similar.
But you will have to learn how to demux the audio from the video, process it and then mux it back in.

And welcome to our forums.

[lordsmurf]

The easiest way to do this is to use TMPGEnc Smart Renderer 4.
Fixing audio is 99% of the reason I bought it. That and sync fixes.
It's so simple with this tool.

[sum_guy]

Simple, open in handbrake, goto the audio tab, increase the gain to 20 and let it encode.