I m looking for a software which record song to a video yet mute the existing song already on the video..i mean mute the existing song and re record the new song.please help me asap
Re: video help (asap)
Here is something get to you started:
An Alternative Solution: Align the Audio Tracks
The best solution which I have found is a variant on the clapperboard method, but it requires only an audio “clap”, and it works independently of any particular video editing software.
What it does require is that the video camera has its own microphone which is recording the same sound as the separate higher quality audio recording that you are making. And it requires access to some audio editing software.
The problem of alignment can be stated as the problem of how much time the separate audio recording has to be moved forwards or backwards to align with the video.
To solve this problem, you only need audio software. The most suitable software for this purpose is Audacity, which is freely available (for free) for Mac, Windows and Linux.
Detailed Instructions
To successfully align your video and audio, proceed as follows:
Record the video and separate audio, with a suitable reference sound at the beginning of the recording (this will be trimmed off once you are finished, so remember to leave a suitable gap between the reference sound and whatever it is you are actually recording).
If they are not already there, copy the video and audio recordings to your computer. (For sound, it is recommended to save as uncompressed WAV, only compressing at the last moment when the final video is to be created. For video, from a consumer video recorder, it is likely to be pre-compressed anyway.)
Start Audacity.
In Audacity, open the video file. Being quite clever about media formats, Audacity will automatically extract and load the audio track of your video. If it doesn’t, then you’ll have to find some other way to get the audio track out of the video.
To add the separately recorded audio track to the same Audacity window, choose the menu item File => Import => Audio …
Note that individual tracks can be muted and unmuted. Also note that, due to being recorded differently, the correspondence between the two tracks may not be completely obvious visually. For example, the camera audio may contain ambient room noise that is not readily distinguishable from music just from looking at the wave forms.
For each track, separately, determine the precise millisecond when the reference note occurs. Do this using a combination of play, stop, zoom in, zoom out and scrolling back and forth in time.
Write down the time of the reference sound in milliseconds for each track.
Using your calculator, subtract one number from the other to determine the size of the gap in milliseconds.
Now, shift the separately recorded audio track in the desired direction by the required number of milliseconds. There are obviously two possible alternatives:
Shift forward, by inserting silence. In Audacity this is done via the Generate => Silence… menu option, making sure to select the hh:mm:ss + milliseconds input option (confusingly, the default “seconds” option looks like it might work, but that’s a comma not a decimal point, so choosing 3,600 will add an hour of silence, not 3.6 seconds).
Shift backward, by firstly selecting from time zero until the required number of milliseconds (you can for example type the actual numbers into the Selection Start and End values at the bottom of the screen, selecting format hh:mm:ss + milliseconds so that you can specify milliseconds, and then secondly hitting the Delete key).
Once shifted, you can test for alignment by playing with both tracks unmuted. If it just sounds like one audio track, then you’re probably good to go.
Now, delete the extracted video audio track from the Audacity window, and then export the aligned audio track to a new WAV file.
At this point, you still have a camera video with its own audio track, and you have a separately recorded audio track which is now perfectly aligned with the video audio track.
Now you need to use some video editing software to replace the video’s original audio track with the separately recorded track.
The video editor I have used is Avidemux. The following steps will create an output video with replacement audio:
Open Avidemux
In Avidemux, choose Open to open the video file.
From the Avidemux menu, choose Audio => Main Track
In the dialog, change the Audio Source option from Video to External WAV
Click on the Browse… button to select the aligned audio track.
Click OK
This gives you a video with the audio track replaced by the separately recorded and correctly aligned audio track.
WARNING: Avidemux may not actually correctly align video and audio when playing the video. (At least it didn’t for me. However this doesn’t prevent you using Avidemux for simple editing tasks.)
Use the selection options to trim the beginning and end of the video (in particular you won’t want to retain the initial reference sound).
Select desired video encoding, audio encoding and container format.
Click Save and choose a file name to save to.
Wait a while …
When it’s done, press OK, and you’re done!
Upload to YouTube, or whatever.
taken from: How to Sync Video and Separately Recorded Audio, Using Only Open-Source Software
Re: video help (asap)
JoelKhan … 
That is way too too much effort …
suhaina
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Download and install or if you already have it … “Windows Live Movie Maker”
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Import the video you want to use
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Import the audio files you want to use
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Drag the video files on to the time line video bar
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Drag the audio files into the " Audio Music" bar
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Right click on the video clips/scenes on the timeline and go to audio and mute
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Publish the file and you will end up with a video with your custom audio on it
Re: video help (asap)
Thanks psyah. I dont have windows so went with audacity.
Re: video help (asap)
I have windows, and I still only use Audacity
Re: video help (asap)
You can also use Camtasia. It’s similar to Windows Movie Maker.
First 30 days of use is free.
Re: video help (asap)
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Re: video help (asap)
psyah where is time line?
Re: video help (asap)
psyah I think I don’t know how to use movie maker.:S . where to import audio and video file? u mean in pc.?where is time line video and audio bar? how to drag it…?if u could tell me briefly exactly whr r the buttons on movie maker .. sorry for ask such dumb question but if u tell me I will be very thank ful to u if u tell me in details please 