I wanted to know for my own knowledge what happens with different codecs with content that is delivered on the web. Most of my shoots require moderate color correction recording in SLOG2. The settings on the camera were as follows: Cine EI Mode 800EI, S Gamut/SLOG2, HG33 LUT applied. Exposed light at 70%. Used a Canon 100mm Macro with an Optitek adaptor. This is by no means a scientific test, but my goal was really to find out if recording in any of the other codecs or color sampling makes a difference for web delivery such as here. The SR codec took an extra step for each clip which for me makes post on larger projects not an option. Based on my final export it was obvious to me that the MPEG compression feared the worst as even withe the incandescent christmas light I saw flickering for some reason in post. To my surprise I saw no difference between SR 444 440Mbps 1080p footage and the 2k XAVC 422 100Mbps footage.
So why would you choose one codec over the other? I shoot mainly documentary style footage, run and gun and corporate content. What I find is that most of what I need are two things 1. Time on card ( have 4-128GB SxS Pro+ cards) so if I am shooting a two camera shoot then codec matters. If I am on a one camera shoot then it doesn't really play a part. If I know that I am producing a commercial that will require a fair amount of post effect and color I would consider the SR 444 codec as I got 45 minutes on 1-128GB card. but based on my tests I could not initially see a real difference with a small amount of grading done to the XAVC and the SR 444 clips. The real difference then comes in at the XAVC clips holds 164 minutes of 2k content.
My other walk away from this test was what should I film in HD or 2k. YPbPr or RGB. I am not Alister Chapman with an encyclopedic knowledge of how these technically change an image, but these tests tell me that unless a client is going to DVD or there is a major reason that the aspect ration has to be 16:9 I will shoot either 2k or 4k from here on out. There is just more image, more pixels to share and to me the wider aspect ration does do something to the experience of viewing a video.