Blackmagic Forum

I’m uploading a ~100 minute video to YouTube that I rendered at UHD DNxHR- it’s about 1.4 TB. Apparently, YouTube limits file sizes to no more than 256 GB. I would’ve uploaded the full 1.4 TB file, but it seems that won’t be possible. Is there a recommended compression format that will get 1.4 TB down to around 256 GB? Naturally, I want to minimize compression and upload the largest file (that’s what I’ve been gathering is the optimal way to go as far as YouTube is concerned). I’m guessing that if I compress to an MP4, it’ll bring the 1.4 TB way lower than 256 GB.

NVENC H265 10bit PQ 12, PCM audio.

Ok, thank you for that recommendation!

I’m sorry but you’re trying to achieve something for very little possible gain since you’re already uploading to a website that heavily compresses. Render your file to h265 uhd and be done with it.

Sean van Berlo wrote:I’m sorry but you’re trying to achieve something for very little possible gain since you’re already uploading to a website that heavily compresses. Render your file to h265 uhd and be done with it.

I would, but I get random artifacts whenever I use a format that has frame reordering within Resolve. DNxHR is (I guess) a less compressed format that doesn't use frame reordering? So I'm rendering in that and then converting it in Handbrake, which prevents the appearance of any artifacts.

Frame reordering really is just b-frames and unlikely to create artifacts whatsoever. Are you using NVENC? If so which generation? Is this an AMD GPU?

In Resolve 16, when I render in a format that employs frame reordering (e.g., H.264 MP4), I see certain artifacts where there is high contrast between overlapping images (or in some fades from bright white to black). They are overall rare, and I'm not sure exactly what is causing them, but when I tried rendering with frame reordering off, the artifacts either disappeared or minimized. Rendering in DNxHR produced 0 artifacts. I don't remember if I tested this with my Integrated Graphics disabled or not (i.e., forcing use of my NVIDIA GPU), but I resorted to just rendering in a format where frame reordering does not appear to exist, and then Handbraking to a more manageable file size.

It sounds like an encoder glitch. That's why it's important what you actually used. Resolve's native h264 software encoder is crap. If you used that, use Nvidia / NVENC. Obviously any all intra format doesn't use b frames aka frame reordering. But it really sounds like you used Resolves software encoder, which I'd avoid at any cost.

Lychon wrote:I want to minimize compression and upload the largest file

Use another service instead of YT if quality is your main concern as youtube will re-encode your video in any case.

Otherwise h265 with high bitrate has been best for me.

peterjackson wrote:It sounds like an encoder glitch. That's why it's important what you actually used. Resolve's native h264 software encoder is crap. If you used that, use Nvidia / NVENC. Obviously any all intra format doesn't use b frames aka frame reordering. But it really sounds like you used Resolves software encoder, which I'd avoid at any cost.

That's what I think happened too- at first I thought I had messed up something in the editing, but it doesn't appear to have had anything to do with my clips or any applied effects.

Noerde wrote:

Lychon wrote:Use another service instead of YT if quality is your main concern as youtube will re-encode your video in any case.

Otherwise h265 with high bitrate has been best for me.

I'm probably going to upload to several other video-sharing sites, but YouTube (for better or for worse) is the elephant in the room. Other sites probably re-encode as well, but after re-encoding with Handbrake and doing a test upload to YouTube, it doesn't look too bad at all, at least for my purposes. Of course, this project is not one that has native 4k footage or anything of the sort, so the difference will probably be less noticeable overall.