Jack Zhang
February 13th, 2015, 11:17 AM
As most FS7 owners have found out by now, the FS7 only does non-broadcast compliant 4:2:0 in it's 150mbps Long GOP mode. It's likely the F5, F55 and Z100 also don't have 10bit 4:2:2 Long GOP in 4K specifically. At the moment this thread doesn't fit into a specific camera thread so I'm posting it here.
With the big broadcasters trying to future proof their acquisition by mandating 4K 60p at 10bit 4:2:2 for major productions, XAVC-I at 600mbps is not space efficient and can be a real pain for long-form stuff like concerts. ProRes at 4K 60p is higher than XAVC-I, so it isn't any better.
I understand hardware limitations may make it impossible to compress Long GOP in real time and still maintain 4K 10bit 4:2:2 at the moment. HEVC is not mature enough to be a broadcast acquisition codec. So this begs the question: For productions that need storage efficency, does everyone think now's not the right time? The F5 and F55 may get new ASICs to support it combined with a new firmware update, but it looks like the FS7 is the only cam that won't be broadcast compliant in 4K Long GOP.
The other argument is, does color subsampling matter at that high resolutions? To the broadcasters, I'm willing to bet so, but to the "YouTube" generation of vloggers that like to hold a FS700 selfie style with a single hand (They exist, and it's quite shocking to see that) they don't care. However, the FS7 is not a Youtuber camera in any sense, so the exclusion of Long GOP 4K 4:2:2 is baffling.
Sony, get on it. Make XAVC-L 4K 10bit 4:2:2 possible.
If I got the F5 and F55 parts wrong (if they already support Long GOP 10bit 4:2:2 at 4K) please let me know.
I also made this thread because I could find nothing on Google about the subject matter.
With the big broadcasters trying to future proof their acquisition by mandating 4K 60p at 10bit 4:2:2 for major productions, XAVC-I at 600mbps is not space efficient and can be a real pain for long-form stuff like concerts. ProRes at 4K 60p is higher than XAVC-I, so it isn't any better.
I understand hardware limitations may make it impossible to compress Long GOP in real time and still maintain 4K 10bit 4:2:2 at the moment. HEVC is not mature enough to be a broadcast acquisition codec. So this begs the question: For productions that need storage efficency, does everyone think now's not the right time? The F5 and F55 may get new ASICs to support it combined with a new firmware update, but it looks like the FS7 is the only cam that won't be broadcast compliant in 4K Long GOP.
The other argument is, does color subsampling matter at that high resolutions? To the broadcasters, I'm willing to bet so, but to the "YouTube" generation of vloggers that like to hold a FS700 selfie style with a single hand (They exist, and it's quite shocking to see that) they don't care. However, the FS7 is not a Youtuber camera in any sense, so the exclusion of Long GOP 4K 4:2:2 is baffling.
Sony, get on it. Make XAVC-L 4K 10bit 4:2:2 possible.
If I got the F5 and F55 parts wrong (if they already support Long GOP 10bit 4:2:2 at 4K) please let me know.
I also made this thread because I could find nothing on Google about the subject matter.