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FCP 7 - Timeline & Output Video Jerky, Choppy, Getting Stuck

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Shitij Kohli
FCP 7 - Timeline & Output Video Jerky, Choppy, Getting Stuck
on Jul 9, 2014 at 8:21:54 pm
Last Edited By Shitij Kohli on Jul 9, 2014 at 9:17:53 pm


I have an iMac with following config.

Processor 2.7 GHz Intel Core i5
Memory 8 GB 1600 MHz DDR3
Graphics NVIDIA GeForce GT 640M 512 MB
Software OS X 10.8.4 (12E55)

I have been editing since last 1.5 years on the iMac, i use FCP 7...Until last 3-4 days everything was working smoothly but now i am having major difficulty with playing footage on my timeline (while playing it jerks, gets stuck...then starts again...& follows the same cycle).

When i make the output file MP4, MOV...the output file also plays Choppy & each viewing the jumps are random (so there is no fixed place where jumps appear, but they do appear)...& the output is sure jumpy.

While editing, even a small change i do creates an Orange color line over the clip (& requires render, without which it doesnt play well, at all)....I think my memory usage (Application = 2560MB) exceeds & thats why Orange lines comes.

I have 500 GB of free space on my iMac. I have 4 external hard-discs connected to my Mac (All Segate plus with 3TB of data each...all the hard-disks are pretty full with less than 30GB of space left free).

I have also deleted the rendered files of all the projects which are not in use now....(had never done that for past 8-9 months)...still the issue remains.

I am editing Canon Mark 3 footage. As always, I have converted the Canon mov files (which were originally shot in H.264, 1920x1080, 25 fps) to Apple ProRes 422 using MPEG streamclip.

My preset for converting the files in MPEG Streamclip is as follows:

Compression: Apple ProRes 422
Quality: 100%
Frame Size: 1920x1080 (unscaled)
Frame Rate: left blank (should read the Canon preset frame rate of 25 fps)
Interlace Scaling - deselected

After batching all the files I imported them into Final Cut Pro. My sequence preset is Apple ProRes 422, 1920x1080, 25 p, 48 khz.

I am not sure where is the issue.

Why is the timeline not playing smoothly as it used to do?
Why is the final output (mp4, mov) jumpy?

Please help!!!


PS: One more point, since the problem has occured, i have applied smoothcam to some clips & when i view them on timeline (after applying) they seem good...once i take out the final edit it looks very bad in the final movie (the whole clip looks disorientated)...this has never occurred before.

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