In some situations you get a movie where the audio is extremely low and even turning the volume of your TV or PC to maximum doesn't give a satisfactory result.
The following PC tutorial for beginners, shows how to permanently increase the loudness of an audio track in a movie/TV show. The example movie uses an XVID codec in an avi container but the method used should be similar for movies with other codec/container combinations.
There are a number of different ways to achieve the same result but I'm using the Avidemux freeware for this tutorial.
Avidemux is available on a number of platforms, other than PC (i.e. Linux, OSX), so while the screenshots may differ slightly for those platforms, the method should be quite similar to that detailed here.
What you need
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Avidemux
Method
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1. Download and install Avidemux.
2. Start Avidemux and you'll get the main interface as shown in Image A.
Image A
3. Select "File->Open" in the top left corner and then select the file you wish to open.
4. If the Index of the file is damaged, then you will get the following dialog, as show in Image B. Just click "Yes" (Item 1, Image B).
Image B
5. You'll now see the following dialog box as the index is rebuilt (Image C). Don't cancel this, just let it complete by itself.
Image C
6. We don't need to touch the video track of the film so we leave the video setting at "Copy" (Item 1, Image D).
We're going to adjust the loudness of the audio track, which requires decoding and then re-encoding of the audio track. So, in the case of the film in this example, for the re-encoded audio track which we are creating, we select MP3(lame) as the the container(codec) combination under the Audio heading. (Item 2, Image D).
Most AVIs use MP3 as the container for their audio track and the Lame codec is an excellent, widely used, free codec.
Image D
7. Now select "Configure" (Item 1, Image E) and check the settings are as shown in the LAME configuration dialogue box. We're using these settings to maximise compatibility with standalone avi player units. If the original film had a mono audio track then this will just result in the new audio track being pseudo-stereo, which will increase the apparent loudness of the audio. With the settings as shown, then select "OK" (Item 2, Image E).
Image E
8. Next select "Filters" (Item 1, Image F). In the dialog box that appears, select a Gain Mode of "Manual" (Item 2, Image F). Now the Gain in this tool is measured in decibels (dB). We're going to skip the theory of this and just note that a Gain of 10dB will double the loudness of the sound perceived by the user. So put 10.00 at Item 3, Image F. Then Select "OK" (Item 4, Image F).
We now select the output format for the movie. In this example that's AVI.(Item 5, Image F)
Image F
9. Now we save the changed AVI. Click "Save Video" (Item 1, Image G). In the dialog box that comes up, pick a location with enough space for the AVI. (Item 2, Image G).
Select a new name for the adjusted AVI. Note that you must manually add the suffix for the file to the file name (in this case .avi) since Avidemux won't add it automatically. (Item 3, Image G) (It's best to save as a new file name and not to overwrite the original version, as you might need the original for the purposes of seeding etc)
Now select "Save". (Item 4, Image G)
Image G
10. The Encoding dialogue box will now appear. If you're not planning to use the PC for anything else while this is happenning then you can change the encoding priority (Item 1, Image H) in order to speed things up. I woulldn't recommend changing this above "Normal" if you are planning to use the PC while the re-encoding is occurring.
If you don't want to wait for the process to finsh then you can tick the box at Item 2, Image H, and the PC will automatically shut down when the AVI is finished.
Image H
11. When the re-encoding is finished you get the following dialog box (Image I). Just click "OK".
Image I
12. That's it.
NOTE : If the avi is one which you are currently seeding or wish to reseed in the future, then don’t save as the original file name as this will invalidate your copy of the torrent. i.e. keep two copies of the avi, one the untouched original for seeding purposes and one for watching/burning to DVD.
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