But if YouTube are now using the VP9 codec for delivery - your file will be re-encoded anyway? - even if you supply a file within spec?
Or am i confusing the VP9 aspect?
I don't have enough spare time to sit and upload test files! The wife thinks I spend enough of my spare time diving, let know in front of the PC at weekends! LOL
VP9 is google codec for 4K which they use for their own content. H264 is a supported codec and as long as you limit bitrate and settings it will not be re-encoded by youtube
H265 and VP9 achieve the same quality of H264 with a lower bitrate so Netflix uses H265 and Youtube uses VP9, I am not sure what amazon uses but the reality is that netflix works at 25 mbps and amazon at 15 mbps. So amazon is targeting high speed broadband and netflix the low end of fiber and cable and so will youtube with vp9
If you want to go and upload H264 at 30-35 mbps on youtube it will be fine but for most users this will mean buffering
This is the reason why am not investing in a 4K recording device just yet I want to see the codecs moving forward in camera meanwhile I am doing some practice on micro 4:3 as I believe the next Panasonic release to implement H265 will come at some point maybe not this year or they will blow off their own GH4 and LX100 sales most likely next year so underwater early 2017