After reaing John’s comments, I did a search on “ffmpeg prores legal” The summary of what I found is that the files created identify as prores with most(?) NLE’s and players but seem to fail within FCP. This indicates that the reverse engineering, which in some countries is in fact legal, failed to get it 100% correct. Thus, a file created using the ffmpeg method is not technically legal as far as strict ahdesion to the format specsifications.
In the law sense of legal I think John makes a good point about Apple being the only one to distribute the prores encoder. I once made a $335 mistake by using music I thought was legal for me to use. I have been extra careful since then. I would not want to find out in 3 years that I have made 100’s pricey mistakes by using an encoder I thought was legal.
I think it is safe to say that the encoder offered in ffmpeg is not 100 compliant with the prores standard and that the use of this encoder would be considered an infrigment of Apple’s technology.
Jeff
2-Xeon X5680 @ 3.33, EVGA SR-2 Mobo, 48GB DDR3, GTX 580 3072MB, 16TB Attached Storage, Win7, Vegas 11 x64