Videos shot on Canon Vixia HF R20 are jerky on iMac. Do I need more RAM?

Hi. I have a new Canon Vixia HF R20 video recorder. I learned here how to upload videos, but they are very jerky. The first few frames seem OK but then the sound continues and the picture remains frozen, then even the sound breaks up. The red bar continues smoothly to move across the thumbnails. Should I have more RAM or something? I have closed all other progams and restarted but this does not help. I have 10.5.8 and the following:
Model Name:
iMac
  Model Identifier:
iMac8,1
  Processor Name:
Intel Core 2 Duo
  Processor Speed:
2.4 GHz
  Number Of Processors:
1
  Total Number Of Cores:
2
  L2 Cache:
6 MB
  Memory:
2 GB
  Bus Speed:
1.07 GHz
  Boot ROM Version:
IM81.00C1.B00
  SMC Version (system):
1.29f1
Thank you in advance!

Is your footage HD? Or what is the pixel size of your videos? I see you have 2 GB, which is at the low end for processing video, especially if it is HD. I have 12 GB and find that is better. I'd at least double yours or max it out; see OWC (macsales.com):
http://eshop.macsales.com/shop/memory/iMac/Intel_Core_2_Duo_PC2-6400
As you can see, Apple officially supports 4 GB, but OWC has tested 6 GB, so the decision is yours.

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