adding audio with avidemux

[ricmetal]

hi guys
im having some trouble with avidemux
i have an mp4 video file with an acc audio track which i need to have added a wav file (and convert this wav it to acc) all in avidemux
can it be done?
avidemux is not bothering with the wav file and exporting the mp4 with only its original audio track.



can inot package the mp4 with an aac and a "to-convert" wav?
regards

[poisondeathray]

Open source muxers do not support PCM WAV in MP4 container . You can put it into a MOV container with ffmpeg

[ricmetal]

Open source muxers do not support PCM WAV in MP4 container . You can put it into a MOV container with ffmpeg

ive added pcm wav audio to at least 7 mp4 videos in the past week with avidemux
what are you talking about?

its get then converted to aac
but adding a wav to be converted to aac doesnt work when the mp4 already has one other aac

did you not see the encoding for the wav in the image?

[poisondeathray]

I'm talking about muxing native PCM WAV into MP4 container. It doesn't work with open source muxers.

If you convert it to AAC, it's no longer WAV, obviously

So convert it to AAC, then add it

[ricmetal]

i converted the wav into m4a but avidemux doesn't accept the file.

[poisondeathray]

Try putting it into MP4 container, or AAC

Or use another muxer like yamb or mymp4boxgui (both GUI's for MP4box)

Avidemux is pretty buggy software

[ricmetal]

yes, buggy with features i need.
is there any other muxer which allows me to change the gain of the audio file already present in the mp4?

[poisondeathray]

yes, buggy with features i need.
is there any other muxer which allows me to change the gain of the audio file already present in the mp4?

Muxers don't change gain.

For aac you can do adjust the gain losslessly with replaygain . But that means it only works with devices or software that supported it (basically all commonly used software players do) . So what you plan to do with this, what target etc.... becomes important

Otherwise you have to re-encode it with the gain and incur quality loss, then mux it . You have to decide what type of gain, e.g. normalize to some db level, or apply a fixed gain etc...

[ricmetal]

avidemux has a gain mode which allows gain change but i have to re-encode the aac (just tested now)

will i loose quality if i re-encode the audio to same format? aac to aac
?

[poisondeathray]

avidemux has a gain mode which allows gain change but i have to re-encode the aac (just tested now)

will i loose quality if i re-encode the audio to same format? aac to aac
?

Yes you always lose quality when you re-encode with a lossy format

But if you use high enough bitrate, you can minimize that loss

Replay gain method is different - it adjusts gain by using metadata, so there is no quality loss

[ricmetal]

ok.
thanks.

i'll have to start exporting audio again and setting gains before converting.

cheers