If you wish to share (export) files from iMovie 10, this is what I have discovered:
1. Reading the basic documentation is helpful ... (As per Judysings) I found something "new to me". Namely, once a movie project is "in" your "Theatre" you can just 'drag and drop' the rendered movie file somewhere else, eg as an .mp4 file onto a USB. However, there remains a mystery about what quality of file gets duplicated to your USB. See Note A below.
iMovie Help: Share to iMovie Theater
http://help.apple.com/imovie/mac/10.0/#mov3b2b964a8
2. When you share a Project to Theatre a "mysterious set of processes" (should) begin. Your Project begins transcoding into several playable movie files (.mp4 format). (a) You know this (background) process is going correctly when you see:
- A notification and task progress bar line beneath your Project in the "Theatre" window of your iMovie. The notification says: Creating Movie.
- The "Activity" circle, top right of screen appears, and slowly turns from an annulus to a filled circle. Click on the Activity circle. It will show you what the CURRENT task is doing, and an expected time of completion. You should note (hope) that time-to-complete decreases as you return to examine this.
- If all is going correctly, your CPU processors will be cooking. In your Activity Monitor you I see ProTranscoderTool_sb using approx 300 % of my CPU (i have a 4-core iMac). Furthermore, I see iMovie using 40 % of CPU, and a steady load on the processors of about 83 %. These figures suggest you should leave your computer alone and go away to New Zealand for a cup of Hobbit tea! (I am in NZ already, so I'll go to Mordor). My computer's fan starts up and the top of the screen gets warm enough to fry eggs.
3. The "mysterious set of processes" in (2) produces, in sequence ,three .mp4 files from your Theatre Project, Moderate quality (?), Better quality, Best Quality. Where these three files live on my iMac is a mystery. The command: Reveal in Finder is not active for the Theatre project. (Why not?)
4. You can ... easily ... upset all these background processes, which you should AVOID! What seems to happen is that the background processes stall/halt/cease/desist/suspend all existence due to getting unhappy about something you might have done.. For example, I found that importing new video footage from a DV camera SEEMED to stall a File Export process I had going in the background.
5. You know your background processes have halted/failed/stalled (perhaps irretrievably?) when (See Step 2):
- The Activity circle stops its countdown, but LIES that it is still doing work (ie the time estimate to task completion fails to decrement; the bar graph beneath the project in Theatre fails to advance, and, more obviously:
- The ProTranscoder no longer uses your CPU.
5. So, what to do when background tasks seem stalled? ... my suggestions.
6. Cancel background processes by clicking on the X besides the Activity circle notification. (The X may not be there for all background processes)
7. Quit iMovie. iMovie will warn you that background processes will terminate. Stop. Look. Listen. Then Quit iMovie.
8. Restart iMovie
Wait to observe if other background tasks in the Activity circle initiate. Decide whether to wait or cancel, depending on whether they appear to be concluding usefully, as per (2). Possibly return to Step 6 and 7.
9. Find your project in the Theatre. Wait a while and see if the processes in (2) begin automatically.
10. If your Project does not appear in the Theatre:
- Find your project in the Library.
- Share the project to the Theatre
- Check that the activities in (2) are restarting.
11. I suspect part of our problems are to do with not understanding the brilliance of the new iMovie 10 interface, and being a bit impatient. See Step 1 above! When all else fails, read the documentation. 🙂
12. My suggestion to Apple is that the Activity circle:
Shows a list of ALL tasks queued up for processing.... Because I discovered its EASY to accidentally create a heap of background tasks, because you think nothing is happening!
13. Maybe there are some bugs in iMovie that cause iMovie fail to restart background tasks after compute-intensive foreground tasks such as:
- Importing new video from a DV camera. (Just a suspicion)
- Too many background tasks
14. Note A: Quality of files 'dragged and dropped' from Theatre.
Once a movie project is "in" your "Theatre" you can just 'drag and drop' the rendered movie file somewhere else, e.g. as an .mp4 file onto a USB. However, there remains a mystery to me about what quality of file gets duplicated to your USB.
I would expect that the file that gets dragged to your USB is the highest resolution version in your Theatre. However, when I tested this proposition by explicitly exporting a file (using SHARE/File), HD I got a LARGER (doubled) file size, due to a doubled data rate (from 5 mb/s to 11 Mb/s). Same dimensions, and same frame rate (fps).
15. Note B: File size on a USB formatted to FAT32 will crash iMovie file export.
If your USB is formatted to, say MS-DOS FAT32, then the maximum file size you can export is a micro-squidgen over 4 Gb. About 1 hour of Better Quality MP4. iMovie Share/File will quite unceremoniosly once you hit the FAT 32 limit. In my case, the limit was about 4.2 Gb.
Suggestion: it might be better to let iMovie export the Project to Theatre, then drag and drop the file thereby created to the USB. If the file is too large, you can SHARE/File specifiying the target file size you require, sacrificing quality if needed. Else, go back to your source Project and split into smaller sections.