Edited audio file loses volume when muxed. Avidemux being used.

[pooksahib]

I sometimes edit the audio of an mp4/avi by opening the video with WavePad, making my changes to the audio, then saving a new mp3 file. Avidemux is then used to put the new audio on to the video but, very often, there's a burst of static at the start. I've no idea why that should be, it seems to depend on where you cut the video originally.

It was suggested to me that I save a wav file rather than an mp3 and let avidemux do the conversion to mp3. This plan works insofar as the 'static' problem doesn't arise but I now have another problem as shown in the attachments. Can anyone suggest why the volume is being lowered and how to prevent this? Thank you for your time.

[davexnet]

Which release of avidemux ?

[pooksahib]

Hi. 2.6.8

[davexnet]

mp4/avi? Do you mean divx/xvid or H264 ? NO need to be coy, the more details the better.

Why don't you use Virtualdub to add the new audio to the avi ?

[jagabo]

Make sure you don't have the audio filters set set change the volume. For example, make sure Gain Mode is set to None.

[pooksahib]

H264 mainly. There may have been some divx/xvids along the way, I wasn't checking. I'll try VDub next time I have a rogue avi but they're in the minority, my files are mostly mp4.

Yep, Gain is None.