Adding extra audio tracks to an mp4 movie file?

I'm new to using iMovie or similar programs for converting/merging video and audio, so any help that steers me in the right direction is greatly appreciated.
I made an mp4 file of a movie, and want to add an audio track to the mp4 file. The audio track is an mp3 file. However, in order for me to have the new audio track sync up with the video, I need the audio track to start playing before the movie begins. Please note that I'm not interested in burning this to a DVD; I just want a new mp4 file with the extra audio track.
With this in mind:
1) What program would be best for merging an mp3 file with an mp4 video file, plus adding extra time to the video in order to accommodate the extra time in the audio track? I have iMovie HD 6.0.3, and the latest version of Handbrake, unless another program is better for this task.
2) What steps do I need to perform to merge the two files? I'm having trouble figuring out how to do this in Handbrake, and importing the mp4 file in iMovie will take forever.
As I said, I'm new to using these programs, so if you need me to clarify anything, please ask and I'll do my best to help out. Thanks!

QuickTime Player Pro ($30) can do the job in just a few seconds. Its .mov container can have up to 99 tracks.
Open the .mp4 file, select all and Copy.
Switch to the .mp3 file, move the playhead to the needed start point and paste in the entire .mp4 file.
The hardest part is a pencil and paper to note the time of each file to find the proper insertion point.

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Open the movie in the QuickTime Player and Select Export -> Sound to AIFF.
Drop the exported AIFF file into iTunes.
Make sure the iTunes CD Import Settings in Prefs is set to the MP3 encoder.
Right-Click on the AIFF file in the iTunes Library display and select Create MP3 Version.

IMovie audio issues. Fine in timeline, but when rendering to iTunes or Media Browser, audio from certain portions of movie files are heard in places where it shouldn't be !

iMovie 11 audio issues. Fine in timeline, but when rendering to iTunes or Media Browser, audio from certain portions of movie files are heard in places where it shouldn't be !
I have created a project where I have a montage of photos and video clips edited together with music under. Some audio portions of the video files are being muted in some areas and those portions are being heard in another part of the project. This is not for all video clips only certain ones.
The project plays fine in the timeline, but when I render the project thru iTunes or Media Browser, this is when the project goes corrupt.
I tried detaching the Audio from the video clips and this somewhat worked, but the original problem still exists with certain audio still being heard where it's not supposed to be.

I have a fix - or rather, a workaround.
WARNING: It is lengthy, but still far better than starting a new project from scratch.
I had this same issue and none of my transitions/clips were at custom speeds, nor did I have anything else weird going on. Unfortunately there is nothing you can do within iMovie to fix this, at least there wasn't for me. iMovie is BY FAR the buggiest software I have ever used and if you haven't already spent hours slaving away on a project, you are so much better off using just about anything else to edit your video.
...But let's assume you have already spent many hours working on your project and you don't want to start all over. Well then, you have at least one option.
It's a pain in the neck, but it's infinitely better than restarting your project from scratch.
This will require:
A software called Soundflower (which is free) and some kind of audio editing software (I use Logic, but really any should work).
1.) You're going to need to export your video with the messed up audio. Typically if you're audio is messing up, you're video is at least usually working just fine (at least it always does for me).
2.) You're going to need to open that video in your audio software and import only the audio. If your software doesn't give you this option, then you're going to need to record the audio from your video using the audio software and Soundflower. You can find tutorials on how to do this, but it's honestly pretty straightforward once you start playing around with you Mac's audio I/O settings. Remember to have your computer's volume all the way up when doing this.
3.) Watch/listen to your video and make notes of where the audio errors occur. I HIGHLY RECOMMEND writing down times too, as they will be extremely helpful later.
4.) Now were going to rip some working audio from the iMovie project itself. Go back into your iMovie project and only play back audio while in the edit window for this step. Do NOT play your project back in full screen.
This part is key: if you try to play back your project from the beginning the audio will usually still mess up. So, what you're gonna have to do is go back on your edit window timeline right before these errors occur and play that specific clip back while recording this working audio with Soundflower and your audio software. Essentially we're only recording the parts of the audio where these errors occur, so try to do this in order if you can. Try to leave several seconds of audio in before the error - that way we can use it as reference when we construct our new audio track.
5.) Now in your audio software you should have your original error-filled audio track and the new clips that we just captured. This part can be painstaking if you're not familiar with audio editing softwares, but as you'll learn, it's really not that hard.
You're going to look at your original audio track and compare it to your new working audio clips. You should be able to notice where those new clips are supposed to go by looking at the identical (or close to identical) waveform shapes in your original audio track. The two should correspond with one another. If you don't understand what I mean right now, you will when you start playing around with the audio. This is why marking times is very important.
Take your new clips and split them up if you haven't already, that way you can drag them around and edit them separately from one another. Essentially your going to line these new clips up with original and then replace the original parts with new ones.
We need to get this as precise as possible, so start off by getting them as close as you can with your naked eye, and then use a zoom tool to zoom in as much as possible so that you can get them lined up PERFECTLY, or at least extremely close. In some softwares you can just drag these new clips on top of the old track, but most of the time you will need to actually cut out the old piece and replace it with the new one. In doing this, zoom in and make sure that you are NOT cutting out a bigger space than your new clip will fill - otherwise you will have small gaps in your audio.
VERY IMPORTANT: Also make sure that this new audio track starts at the EXACT SAME time as your original - otherwise your new audio will be out of sync.
I know this part can really suck if you're not used to audio editing, but at this point, there is little other choice.
6.) Once you are done with this, export your newly pieced together audio track.
7.) Now open iMovie and create a NEW project. Re-import the video that you exported earlier that has the messed up audio. This might take a while, so just be patient.
8.) Then right click the clip and select "Detach Audio". This will do just that - allowing you to edit the audio separately from the video. Now delete this audio.
9.) Now, import the new, perfect audio track that we just made and make sure that it starts at the start of the project. Make sure it's in sync and that everything works.
Now just export your new video with the working audio and you should be done. Since we have given iMovie the audio with no editing actually being done in iMovie, it does not have to generate its own audio now and you should have absolutely no errors now - unless there is some that you forgot to take out earlier.
YOU'RE FINALLY DONE!!!
I know this entire process *****, but if you're that far into your project, there is little else that you can do. Now you've learned your lesson:
DON'T USE IMOVIE EVER AGAIN.
I hope this helped!

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.mp4 is just a media-container, or wrapper.
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I was thinking about why the songs arent importing and I feel that its either, A) the format of the files has changed since you last imported them, or B) you may need to rebuild the iTunes library.
Here is an article about doing just that:
iTunes: How to re-create your iTunes library and playlists
http://support.apple.com/kb/ht1451
Re-creating the iTunes Library file
Note: After re-creating your library, any devices that you sync with iTunes (Apple TV, iPod, iPhone, iPad) will see your iTunes library as a new library and will completely resync. The next sync with such a device will take longer and may reset some options since your rebuilt library isn't familiar to the device.
1. Quit iTunes.
2. Locate your iTunes folder (this is the folder that contains the iTunes Library and iTunes Library.xml files).
Operating System
Default location of iTunes Folder
Mac OS X
/Users/[your username]/Music
Microsoft Windows XP
\Documents and Settings\[your username]\My Documents\My Music\
Microsoft Windows Vista
\Users\[your username]\Music\
Microsoft Windows 7
\Users\[your username]\My Music\
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5. Drag the following file from your iTunes folder to the Trash:
Mac OS X
"iTunes Library" or "iTunes Library.itl"
Microsoft Windows
"iTunes Library.itl"
6. Open iTunes.
Important: Do not add any content into iTunes at this point (such as by purchasing something from the iTunes Store).
7. Choose File > Library > Import Playlist.
8. Navigate to the "iTunes Library.xml" file on the Desktop.
Mac users: Click Choose.
Windows users: Click Open.
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Regards,
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Hi,
with some help from replies to other questions I managed to get a working DVD/BR with cool 2.0 / 5.1 sound and subtitles.
But for now I do have to select the audio track manually and also I do have to enable subtitles from the DVD/BR players menu.
So I wanted to add a DVD/BR menu where you can choose the audio track which should be played and to switch on and of subtitles.
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Thanks for your posting, but there is the higlight Layer.
I opend the menue in photoshot once more and enabled the layers.
For me a button has the following different states:
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Mouse Over, the highlight shows up, so you can see where you are with your mouse. e.g. "English Subtitle √"
Mouse left click, the highlight "sticks" to the menue item and when moving the mouse avay it is still highlighted, e.g. "English Subtitle √"
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I thought, the highlight button states are markend with (=1) & (=3) ....
BTW. in encore menue edit mode, if I click the show selected/activated Subpicture Highlight, the right layer shows up (with my √-symbol)
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Regards . Götz

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Codec : icod
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Adding extra audio tracks to an mp4 movie file?

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