Note the project sample rate in the lower-left corner of Audacity - that’s the rate it will use when exporting. Is it the same length as the original? If so, you should be good to go, so you can delete (or, safer, mute) the original voice track (unmute the other two if necessary) and export the MP4. Then, open the iMovie project with the three original tracks (one video, two audio) and add a new blank audio track at the bottom and import the edited WAV file. Export a WAV of that and take it into Audacity to edit the silences. If muting doesn’t work, make a COPY of the iMovie project, detach audio from video, then delete the video and game-sounds audio track so that all that remains is your voice track. See if you can mute the video and game-sounds tracks to export just your voice as a WAV file. In iMovie, detach the audio from the video (if necessary) so you have three separate tracks - one video and two audio. I believe there is a little delay (beginning silence) added to MP4 audio too but the decoder might automatically remove it. MP4 audio (M4A or AAC) is more immune to accumulated damage than MP3. That’s a constant delay so it can be fixed and it doesn’t get worse with longer files. If you must use lossy compression MP3 will add a few milliseconds of silence to the beginning of the file so you may have to slightly re-adjust the timing after loading the audio into your video editor. I have a program called Womble MPEG Video Wizard that has a “fix timestamps” feature (which sometimes works), but I think it’s no longer available, it’s not free, and it might only work with MPEG-2.īTW - It’s best if you can export to WAV (or another lossless format) to minimize the number of times the audio is lossy-compressed. But, that’s a lossy process even at a higher bitrate. Sometimes, I’ve solved it by transcoding the original audio/video file to a different (usually slightly higher) bitrate or to a completely different format. It seems to happen more often with MPEG-4 or MOV files than with MPEG-2, and DV-AVI seems to be pretty-much immune. The more compressed files seem to be more prone to this. I think the problem is “timing glitches” in the original MP4.
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