Love how Apple keeps taking segments of the previous version and making them disappear. Overall I can't say I am thrilled with '13 version. Titles have become increasingly limited in terms of being able to chose your preferred font and positioning of text. In many cases you get only the font they start with and NO chance to center, or right or left justify.
Now to this problem and in my case a 2010 iMac with latest iMovie '13 (10.0.9) and latest OS Mavericks.
I made a couple of movies with a single 60-90 second strip of home movies.....no edits and a single title. No problems.
But then I put together a nearly 7 minute movie with lots of interview segments and photo and video overlays and titles and some music at open and close.
Went to render the first draft to YouTube and got the -50 video render error. Went searching here and found some people speculating that the problem might be using video clips less than five seconds. Checked and adjusted those....same problem. Called Apple tech support (had to pay for it and they claimed they weren't even aware of the problem (as of today....astounding given the number of messages posted here about this problem.)
One of the big hassles is trying to figure out WHAT element of my production is causing the render problems and I do have one item here which could help community members who have the same hassle.
Go ahead and SHARE the movie and export it to a selected file location on your computer (not YouTube or Vimeo)
The render will begin and if you are having render problems, at some point the process will halt and you will get the dreaded -50 error message.
However, I discovered that I DID get an output file in my specified location. But, it was only about two minutes and 20 some seconds long instead of the full movie length of nearly 7 minutes.
So I went to the end of the truncated video file I had created and THAT pointed me to where, in the movie, the render problem was arising.
Went back to my movie and found the potential problem clip which was the next one after my shortened video ended. First, I tried detaching the audio and keeping the photos I had been using as cutaways....I assumed that would be getting rid of possible problem video, but that didn't work either.
So, I then simply cut out the whole clip (fortunately the rest of the narrative repeated most of the information in what cut deleted) and tried another render. This time it worked.
So bottom line....go ahead and render your full movie....if there is a render error you will get a video file that runs only to the point where something in your movie is causing render problems. It is a pretty quick way to zero in on the problem clip. However, if there are additional problem clips downstream, you may have to do this more than once. Fortunately, I only had to do it this one time. Hope this helps, although it still doesn't explain what the problem was with the clip that was causing the error, and Apple sure seems to be less than aware or interested in solving the problem.
