OT: is it possible to increase the volume in an mp4 file

[Ranjan Maitra]

Hi,

I apologize for this OT question but I have just finished recording an hour-long masterpiece for my class. However, the volume appears to be really low. I don't know why this happened, but long story short, I really do not want to do this again, so I was wondering is there any software on Fedora 31 that will allow me to edit the mp4 to increase the volume. I doubt that this is that easy, but I still thought that I would give it a try.

Many thanks again for your suggestions, and best wishes,
Ranjan

[Ed Greshko]

On 2020-04-02 11:44, Ranjan Maitra wrote:
> I apologize for this OT question but I have just finished recording an hour-long masterpiece for my class. However, the volume appears to be really low. I don't know why this happened, but long story short, I really do not want to do this again, so I was wondering is there any software on Fedora 31 that will allow me to edit the mp4 to increase the volume. I doubt that this is that easy, but I still thought that I would give it a try.
>
> Many thanks again for your suggestions, and best wishes,

Not really OT since it is a question about usage of utilities under fedora.

I'm sure there are command line options.  However, I've been using HandBrake from rpmfusion quite
a bit to add Chinese subtitles to movies for friends and family.

One of the options when doing this is in the audio area to up the gain.  I've used this option and it has
served me well.

[Doug McGarrett]

On 4/2/20 12:03 AM, Ed Greshko wrote:
> On 2020-04-02 11:44, Ranjan Maitra wrote:
> > I apologize for this OT question but I have just finished recording an hour-long masterpiece for my class. However, the volume appears to be really low. I don't know why this happened, but long story short, I really do not want to do this again, so I was wondering is there any software on Fedora 31 that will allow me to edit the mp4 to increase the volume. I doubt that this is that easy, but I still thought that I would give it a try.
> >
> > Many thanks again for your suggestions, and best wishes,
>
> Not really OT since it is a question about usage of utilities under fedora.
>
> I'm sure there are command line options.  However, I've been using HandBrake from rpmfusion quite
> a bit to add Chinese subtitles to movies for friends and family.
>
> One of the options when doing this is in the audio area to up the gain.  I've used this option and it has
> served me well.

If you have to increase the gain significantly, the SSN--signal to noise ratio--is likely to take a beating. Try it and 
see.  --doug

[Samuel Sieb]

On 4/1/20 8:44 PM, Ranjan Maitra wrote:
> I apologize for this OT question but I have just finished recording an hour-long masterpiece for my class. However, the volume appears to be really low. I don't know why this happened, but long story short, I really do not want to do this again, so I was wondering is there any software on Fedora 31 that will allow me to edit the mp4 to increase the volume. I doubt that this is that easy, but I still thought that I would give it a try.

ffmpeg is a great tool for adjusting media files.
https://trac.ffmpeg.org/wiki/AudioVolume describes only for a .wav file, 
so here's what should work for yours:
ffmpeg -i input.mp4 -c:v copy -filter:a "volume=1.5" output.mp4
That should just the video directly and adjust the volume by 150%. 
Adjust as necessary.

OT: is it possible to increase the volume in an mp4 file [Solved]

[Ranjan Maitra]

Thanks very much to Ed, Doug and Samuel.

I installed and used handbrake with the following:

HandBrakeCLI --gain 20 -i Worksheet13.mp4 -o temp.mp4

and while not a masterpiece any longer, it will pass, especially for those who did not know what the silent treatment conveyed....

Thanks to Sam also, this would have been an easier option. I will try it but since I have uploaded and there is a limit on the MB of files I am allowed to have (and no way to delete files up on Canvas), I will not upload further.

As always, this is such a knowledgeable and helpful group! NO wonder I have stuck to Fedora from FC1!

Many thanks again and best wishes,
Ranjan

On Wed, 1 Apr 2020 22:04:46 -0700 Samuel Sieb  wrote:
> On 4/1/20 8:44 PM, Ranjan Maitra wrote:
> > I apologize for this OT question but I have just finished recording an hour-long masterpiece for my class. However, the volume appears to be really low. I don't know why this happened, but long story short, I really do not want to do this again, so I was wondering is there any software on Fedora 31 that will allow me to edit the mp4 to increase the volume. I doubt that this is that easy, but I still thought that I would give it a try.
>
> ffmpeg is a great tool for adjusting media files.
> https://trac.ffmpeg.org/wiki/AudioVolume describes only for a .wav file,
> so here's what should work for yours:
> ffmpeg -i input.mp4 -c:v copy -filter:a "volume=1.5" output.mp4
> That should just the video directly and adjust the volume by 150%.
> Adjust as necessary.
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