I don't have an answer to your question about conversion software, but if you have been able to import from this camera in the past, then either you have changed the settings on the camera, and it is now recording in a different format than before, or something has changed on your computer. It would probably be worthwhile to figure out what is happening, because it may impact future projects.

Do you still have any Sony Bloggie video, from an earlier project, that you can try to bring into Vegas? If so, that will let you figure out whether the problem is caused by a change in the video format, or whether something on your computer has changed.

I believe that some MP4 formats (MP4 has lots of different formats) require Quicktime. If your Quicktime installation has changed, then this could keep you from importing the MP4 files.

Do you have more than one version of Vegas installed? I think that native import of some flavors of MP4 wasn't supported until Vegas 10. In addition (and I've had this happen myself), some MP4 files will import into Vegas 10 without Quicktime (I do not have Quicktime installed on my main computer), whereas other MP4 files absolutely require Quicktime. I often try to bring MP4 files into my Vegas 10 installation, and when that doesn't work, I send it off to an old computer that has Vegas 7 installed, but also has Quicktime. I then render out from that using Cineform or MXF, and then use that file. So, in my case, my "conversion software" is another instance of Vegas, but with Quicktime installed.

I'm guessing that you have changed a setting on the Bloggie and are now getting a different MP4 version. If so, then changing the Quicktime installation may be the easiest solution to your problem. Others with more experience may be able to offer more specific help.

Thanks Rob and John,

I agree something is different between last week and this week, but I didn't actually change any settings, it just somehow came out without audio and wasn't recognised in Vegas.

BUT

Since I posted I have continued searching and trialling, and my fourth try was successful - I found a program called Aunsoft Video Converter and the free trial version has just converted it to a new MP4 which Vegas will accept!

Life is ok again. I shall now purchase the full version ($35) to get rid of the watermark.

Did Quicktime update itself?
What are your Vegas and QT versions.

Vegas Pro 12 Bld 714. QT 7.7.4

I've seen a couple of other posts about 7.7.4, released about five months ago.
No promises, but a rollback to 7.4.x would rule it out.
There's also a "Quicktime Lite" being talked about on the Movie Studio forum.

Yes, thanks musicvid10, I'll keep an eye on that.

I don't think that was the cause here though - something different happened in the camera to produce a non-standard file. I just tried shooting another test with the same camera and this time the audio was there and it came straight into Vegas.

Fortunately the Aunsoft program was able to read the non-standard files and convert them to Vegas compatible MP4s.