Nininini said:
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Stitching video together is always high risk. Files contain headers, color data, often compression, you want to avoid it as much as possible. I'm not a professional videographer, I just make some youtube videos, but almost all the issues I have experienced with video happen during stitching and rendering.
Are you stitching together videos that come out of the same camera/device/time & day or different?
Just rendering in a different format almost always causes color changes. if you turn a .mov file into MP4 for example, I can use 3 programs for it, handbrake, vegas or video studio, all 3 have very slightly different colors.
That applications have different color is not unreasonable - so too do Canon's DPP, Adobe's Lightroom and Phase One's Capture 1. So keep everything in the original format until joined together.
But all this is very interesting because FAT 32 (used by all of Canon's DSLRs) limits the individual file size to 4GB.
To use some numbers from here:
http://www.imaging-resource.com/PRODS/canon-5d-mkiii/canon-5d-mkiiiVIDEO.HTM
91Mbps ~ 11MB/sec ~ 660MB/min ~ 6:12 minutes long.
31Mbps ~ 4MB/sec ~ 240MB/min ~ 17 minutes long.
Of course maybe imaging-resource.com is lying but I've seen many references on the web that point to such limits on video recording time due to FAT32 file sizes being limited to 4GB.
For those that are shooting video on Canon DSLRs, what video rate (in MB/min) do you get? And what size cards are you using?
Is anyone here using the Canon 1DC? For 4K, what was the maximum duration for a single file and at what bit rate?
Now for 4K video, assume the bit rate at least doubles and if the bit rate doubles then the maximum file size in terms of minutes halves. Which gives us a file size of about 3 minutes for 4K on a FAT32 card.
From the 1DC manual is this little segment (page 56)
http://www.manualslib.com/manual/430741/Canon-Eos-1d-C.html?page=56:
Cards with 128 GB or lower capacity will be formatted in FAT format.
Cards with a capacity over 128 GB will be formatted in exFAT format.
... this is apparently true for many other Canon DSLRs (5D Mark III included.)
So the file size limit will also kick in on the 1DC if you're using a 64GB or smaller sized card for 4K video recording.