I am trying to find the best way to convert footage from my gopro camera to prores. I seem to have stumbled across nastiness.
Gopro footage : 1080p 25fps
Using Prores 1080p 25fps (not proxy, LT etc)
I have tried converting my in compressor. I have also tried rendering the mp4 in fcp 7 and exporting a self contained version prores version for fcp 7. I have tried using compressor 4 (also installed) and moeg streamclip. When I look at the resulting prores video using scopes in either fcp or color it looks like the footage has been clamped to the broadcast safe values. Where pointy peaks should be, there are flat dense lines at the broadcast safe values. Pulling back the highs in a three way color correction revels a reduction in detail, particularly notable in the highlight areas
Through much trial and error, I have discovered that if I convert to prores using the ancient QuickTime 7 app there is no "clamping" and there is significant detail retained in the highlight areas (and darks too). This allows me room to color correct to better result.
It seems qt7 is only thing that will do the conversion accurately.
I have double checked as much as I can. In color for example I do not have "broadcast safe" switched on. It has made me doubt my process and I feel I have gone through fcp and compressor (and mpeg stream clip) as much as I can looking for some sort of similar "broadcast safe" switch.
I obviously don't want to loose highlight info at such an early stage of the workflow.
As far as I can tell, it does not happen when converting to gopro's CineForm codec and highlight detail beyond the legal broadcast level is retained.
I would love to hear that I am missing something about this or doing something wrong!
MacPro 4x dual core
Mountain lion (latest updates)
Note: I have fcp x installed but I am not using this for this job.