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Seems an odd option then, who specifies 100mbs long-gop? Even the BBC will accept 50 for prime time. Or was that only 50 in .mxf files?
100mbps long-GoP tends to be the "pro" starting point for acquisition in H.264 /4K
Just done so for discovery channel, it's in their white paper.
50 mbps might be okay for some 4:2:2 codecs. I really can't remember.
BBC will obviously take all sorts depending on content/programme.
GoPro 7 was 60-80 IIRC.
We're moving on to HVEC / H.265 now. Playing with it. It's on most new kit.
A bit off-topic, but since we're talking about video, and there are knowledgeable people in the house, I have a couple of questions (very naive) ...
Are some GPU designed to be better for video than others, e.g. including hardware support for specific operations (I'd use the word "codec" but I don't know what it means!)
Are NVIDIA better/worse than AMD in this respect.
Is there a link between power supplied from your plug and performance of GPU, e.g. will it run faster if plugged into the mains than if you're running off your laptop battery? This last one sounds absurd to me, but as I said above, I know nothing about it!!
Are some GPU designed to be better for video than others, e.g. including hardware support for specific operations (I’d use the word “codec” but I don’t know what it means!)
yes it depends on the software support of choice.
Codec - compressor / decompressor - the thing that crunches your video files down to small sizes so they fit on a memory card.
They are the technology that allow amazing streaming standards across many platforms.
Are NVIDIA better/worse than AMD in this respect
In general NVIDIA seem much better supported on the software I use. I do have an AMD platform and it doesn't work as well as the NVIDA CUDA stuff. I think AMD is mainly OPEN CL. I think both can support both!
Adobe seems to be better set-up with NVIDIA/CUDA.
https://create.pro/blog/opencl-vs-cuda/
Is there a link between power supplied from your plug and performance of GPU, e.g. will it run faster if plugged into the mains than if you’re running off your laptop battery? This last one sounds absurd to me, but as I said above, I know nothing about it!!
There is a link to a GPU getting enough power to work for sure - but not at the plug end - at the PSU (Desktop) - it should be able to deliver around 200-350 (and surplus!) watts for 1080ti. Mobile less.
But it's not really linked to performance - if the card doesn't get enough power - the computer will likely shut down, which is of concern if you build your own system. Off the shelf should be sorted.
Sometimes running from battery the power management will scale the GFX/Resources back - just make sure make sure you have everything to high-performance.
Are some GPU designed to be better for video than others, e.g. including hardware support for specific operations (I’d use the word “codec” but I don’t know what it means!)
Again - CPU is pretty much the king of the codec. Get as much power as you can afford. Our CPUs run at 100% when editing/outputting. The GPU is only 25-50%.
We've just done 10 part doc for Discovery and we did it in 10bit 4K which was real taxing. It works but very stuttery.
We should've done it in 400mbps Intra. However flip side cards are expensive for the amount of data involved.
Pick your poison.
Are some GPU designed to be better for video than others, e.g. including hardware support for specific operations (I’d use the word “codec” but I don’t know what it means!
There's an advantage to using the Nvidia workstation cars (quadra) over the gaming ones (gtx, rtx etc) but it's of very marginal benefit for occasional use, and the other way round the quadra cards are much worse for gaming. So unless you plan on doing it professionally stick with gtx1080 (or any of the 16xx, 20xx cards).
Codec's are a minefield of geekery. There's video codecs, audio codecs and then different ways of combining them. e.g. .mp4 can use h.264 and h.265, as can .avc, but AVC uses a different audio codec to .mp4. So some older hardware won't playback a newer .mp4 containing a h.265 video despite playing back older .mp4 files.
Just be aware that h.264 uses about 50% more data for the same picture quality compared to h.265 and long-GoP (group of pictures, i.e. the compression works by only recording the difference between a group of frames) reduces file sizes by about half compared to iframe (intra-frame, compression only by looking at each frame individually). So where it gives an option go for h.265 and long-gop.
Most consumer level cameras, and most consumer level editing software should be able to deal with anything the other does, just check!
4K mode is the best on GOPRO as you get the most detail to play with.
With the caveat that you then need a faster workstation, more storage etc.
Also the H7 crashes a lot in anything above 1080. Depends how long your recordings are (i.e. it's fine 99% of the time for a ride down a trail, I wouldn't trust it to be left running recording your back garden for hours watching for wildlife).
With the caveat that you then need a faster workstation, more storage etc.
True but then what's there isn't much point in the 4K GoPros - unless you want the slow-mo/stablisation etc.
These things aren't the last word in quality but they have got a lot better.
what's the H7 BTW?
The difference in the quality of YouTube compression between 1080p and 4k videos, especially MTB ones since theres usually a lot more movement is massive. That's why I will always shoot and upload 4k videos to YouTube.
Watch a pov MTB video on YouTube first in 1080p then 4k, it's night and day.
what’s the H7 BTW?
Sorry, hero 7. I was being lazy. We had endless trouble with then crashing when left to run in 2.7 or 4k.
Dont think we ever found a solution, GoPro blamed Anker power supplies and we checked on a scope they are actually quite noisy so it could have been that as we also struggled with timecode. But they would do it when running on their own batteries too (just less often as you could only run for an hour anyway).