Do some research on setting up your macpro for "distributed" rendering using qmaster. This will allow you to utiltize the multiple cores on your computer and vastly speed up the rendering. It usually takes a little bit of playing with the settings in the system prefrences: apple qmaster to find the optimal setting. I seem to remember that you need to install qmaster when you did the fcp install. you can always install it now doing a custom install.
Because I've found some MP4s to cause Compressor grief and this sounds like it might be an example. A one day MPEG2 encode of a one hour MP4 is off the charts abnormal. First converting the file to an intermediate format is worth a shot.
But if the original file were playing nice with Compressor, then no…I wouldn't recommend it and would expect adding the PR transcode step to double the processing time, more or less.
Did a test tonight...
Converted an one hour h.264 video to DVD and converted the same one hour video from ProRes 422 to DVD. It is faster to convert a ProRes movie to DVD compared to using an h.264 video to DVD. When converting the one hour h.264 to DVD the fans on the iMac sped up indicating to me that the h.264 to DVD placed bigger load on the iMac. The fans ran normal with the ProRes file. Converting the video from h.264 to ProRes, the fans ran normally. Did not look at the final video. I would bet 2 bucks that the ProRes video converted to the DVD format safely.
One hour video...
H.264 to ProRes
4 min 45 sec
ProRes to DVD
1 pass VBR Best
8 min 16 sec
h.264 to DVD
1 passVBR Best
12 min 10 sec
ProRes to DVD
2 pass VBR Best
16 min 45 sec
h.264 to DVD
2 passVBR Best
24 min 31 sec
27" Early iMac
3.4GHz Quad-Core Intel Core i7
16GB 1333MHz DDR3 SDRAM - 4x4GB
2TB Serial ATA Drive + 256GB Solid State Drive
AMD Radeon HD 6970M 2GB GDDR5
Apple Qmaster sharing set to 4 instances...
I always convert convert mp4 or h.264 videos to ProRes LT. Better to use ProRes LT over ProRes 422. The file is smaller and the quality damage has already been done to the mp4/h.264 video. (You won't see the difference between PreRes LT or ProRes 422.)
How are you converting to ProRes? I'm trying it now in MPEG Streamclip and for an hour of video it's taking well over an hour to convert.
For some reason Compressor won't even allow me to add .mp4 files any more. Weird.
I've just downloaded a trial version of PavTube Video Converter and again, for an hour of mp4 it's taking well over an hour to convert to ProRes LT.
I'm open to suggestions folks...
Download this free Compressor repair app from Digital Rebellion:
To setup the Qmaster in Compressor:
Setup the panel like below
Click on the option button...
Pick half what is shown for Number of Instances. (After you try the a test video. Max out the number of instances and see which setting works best for you.)
In the Inspector window... check Allow Job Segmenting...
Pick your cluster... Submit.
Try a short video, 3 minutes or so that you know that works in Compressor. Compress to h.264 for convenience. You can (should) open Activity Monitor app to see how Compressor is working.