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AVCHD rewrapped to MP4
I edit AVCHD in PP CC on Windows 7. Up until now, I have simply bulk-copied a card full of AVCHD to my hard drive, making sure to preserve the folder structure of the AVCHD as I did so. That works fine.
I am trying something a bit different. I collaborate with editors who cut on FCP, so I’m looking into rewrapping (not transcoding!) my AVCHD footage into MP4. I’ve used AWPro to do the rewrap, and the MP4 files it generates play fine in Windows Media Player and Quicktime for Windows.
However, when I import these MP4 files into Premiere Pro, something very strange happens. The clip is longer in PP than its actual size–a 00:11:45 test clip imports into Premiere Pro as a 00:14:15 clip. However, the audio imports at it’s correct length of 00:11:45, while the picture imports at 00:14:15. As a result, picture and sound are out of sync, and the picture runs slightly slowly and about two minutes too long.
Has anyone else run into a problem like this one? Any thoughts on what might be causing it, or how I might fix it? Thanks for your help!
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3 Replies
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Dont use that converter.
Obviously it does not work correct.———————————————–
Adobe Certified Expert Premiere Pro CC
Adobe Community Professional -
Actually, AWPro does a re-wrap, rather than a transcode. And the app is simply a GUI for ffmbc, which a lot of people apparently use to rewrap AVCHD. So, I think it’s far more likely that I’ve got a setting wrong.
However, I suppose it would be a good idea for me to try ffmbc from the command line, just in case AWPro is feeding ffmbc a bad parameter.
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That sounds about right. Also, some cameras have a variable frame rate that has caused issues with ffmbc as well as adobe software in the past. You may want to make sure your AVCHD folder structure is intact.
With one camera, I rarely have a problem. I do two conversions and I’m done. But with multiple cameras and long recordings, this is dreadful slow. I’ve started using MTS joiner software, That just combines the files, then I edit them in Adobe while I convert a copy for output (note that the converted copy is usually huge prores). When I finish editing, I move on.
When I cannot edit the file capably, I have to convert first. When I do that, I usually go to Prores Proxy for working files, then to the full format for output.
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