For people who use Sony Vegas 8 or less for editing, and you can’t edit you mp4 or mov files here’s the fix or way around it without having to convert it.
Do not update to Quicktime 7.6.4, stay with 7.6.2. For Sony Vegas users, it was causing problems with mp4 and mov files, I don’t know why this is im just here to tell you not to do it.
Another problem people are having that i have seen, is that they are complaining when they drag a .mov clip from their camera into vegas, it shows the video but no audio, or the audio is just dead on the time line.
To fix this, just change the extension of .mov to .mp4 then drag it in., it should then work with audio. If by some chance it doesn’t then here’s what to do next.
Last choice would be to convert it with a program called MediaCoder, or you can get quicktime pro so you can export the mov or mp4 file. When you are exporting in Quicktime, make sure you select MP4 – and Pass through.
What this does is that it wraps the .mov file in .mp4 container, so vegas picks up the audio. If your video is then laggy, then you can google that or I will write-up a tutorial on a fix for you.
If you have any problems at all in getting this fix to work, then let me know by dropping a comment.