I am looking for any help on how to add an mp3 audio file onto a video file. The video format is in mp4. I can cut the mp3 to the length of the video clip but how can I sync that audio with that clip the easiest way. Any advice here please? Also what's the best format for a video which gives high quality picture and sound? Thanks.
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You can't just insert a piece of audio into a video container at an arbitrary point. It has to be a complete audio track with a matching length to the video. So you will either have to mix it into the existing original audio, or create a new track with silence up to the point where you audio starts, and from the end of your audio to the end of the clip.
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