Solved avidemux trying to add mp3 to avi

Click audio in the menu bar. Go select track. In the window that opens check track 1 enabled. In next field click dropdown and add audio track to browse to your audio. See snip

avidemux.jpg
 

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Thank you for your detailed response. It worked! I had posted this question on many other forums. Their responses reminded me of the old Settlement Cook Book where it often said "Cook Until Done".
 

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It's a handy program. I use it a lot to boost low audio on movies -

video - copy
audio - select codec - filter - manual gain 12dB (say)

you can also do lossless edits, as long as you cut on I-frames

video - copy
audio - copy
 

My Computer My Computer

At a glance

W10 Pro x64, W7 Pro x64 in VMwarei7 2600K @ 4.4GHz8GB Mushkin @ 1600MHzNvidia GTX 750 Ti
Computer type
PC/Desktop
Computer Manufacturer/Model Number
self build
OS
W10 Pro x64, W7 Pro x64 in VMware
CPU
i7 2600K @ 4.4GHz
Motherboard
MSI Z68A-GD80
Memory
8GB Mushkin @ 1600MHz
Graphics Card(s)
Nvidia GTX 750 Ti
Monitor(s) Displays
27" Benq + 27" LG
Screen Resolution
1080p
Hard Drives
500GB 850 Evo SSD + 3 * 2TB Seagate
PSU
EVGA 650 GS modular
Case
Antec 300
Cooling
Seidon 120V v2
Internet Speed
62/18 Mbps
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Defender (W10) + MSE (W7)
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I agree. Several of my clips have poor video. Avidemus separates out the audio easily. Audicity can often clean up the audio without the loss of sync. Then Avidemus rejoins the video and audio.
 

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Another Avidemux tip - if a movie audio is out of sync, you can determine the ms shift amount (milliseconds = 1/1000 second)) by playing the problem movie in VLC and hitting J or K till it's in sync (this jumps the audio in +/- 50ms amounts), then re-muxing in Avidemux using the correct timeshift value from VLC in 'shift ms'.

VideoLAN - VLC: Official site - Free multimedia solutions for all OS!
 

My Computer My Computer

At a glance

W10 Pro x64, W7 Pro x64 in VMwarei7 2600K @ 4.4GHz8GB Mushkin @ 1600MHzNvidia GTX 750 Ti
Computer type
PC/Desktop
Computer Manufacturer/Model Number
self build
OS
W10 Pro x64, W7 Pro x64 in VMware
CPU
i7 2600K @ 4.4GHz
Motherboard
MSI Z68A-GD80
Memory
8GB Mushkin @ 1600MHz
Graphics Card(s)
Nvidia GTX 750 Ti
Monitor(s) Displays
27" Benq + 27" LG
Screen Resolution
1080p
Hard Drives
500GB 850 Evo SSD + 3 * 2TB Seagate
PSU
EVGA 650 GS modular
Case
Antec 300
Cooling
Seidon 120V v2
Internet Speed
62/18 Mbps
Antivirus
Defender (W10) + MSE (W7)
Browser
Firefox
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