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good cheap video-edit card for my build?

#1
SUMMARY:
I'm hoping that getting a dedicated video card will solve my major pet peeve re editing in VRD (slider lag time). If it will, I need recommendations for a low-budget (probably therefore used) video card that'll do the job. And the card needs to be standard PCI height, not taller like some fancy gaming cards, or it won't fit in my case (I have a side fan positioned over the mobo). System specs:

Computer type: PC/Desktop
Computer Manufacturer/Model Number: Homebrew build
OS: 7 Pro x64 (desktop), 7 Ultimate x86 (laptop)
CPU: i7 3770K (no OC)
Motherboard: ASRock z77 Extreme 4
Memory: 16G (2x4) Corsair Vengeance DDR3
Graphics Card(s): n/a
PSU: Corsair TX650M
Case: generic Enlight
Cooling: air front-back 92mm push-pulls; side 120mm push, 80mm pull
Browser: FF only

=====================================

DETAILS:

I won't have the dough to make a new build for at least three more years, so I need to give my current system a new lease on life. Just upgraded ram from 8G Patriot to 16G Corsair, but also need to get a video card. I've been limping along with onboard video ever since I built the system, and for its twilight years I'm hoping to ease the pain a bit.

My biggest peeve with VRD isn't processing/muxing time; what I find most annoying is when I'm actually doing the editing and there's lag in response. I.e. when you right-click to drag the slider forward or backward, instead of getting instant results, you have a lag. If a dedicated video card will eliminate that or at least reduce it considerably, I'll grit my teeth and open the wallet (to a limited extent, unfortunately).

So IF--and that's a very, very important if--a dedicated video card would eliminate the editing lag, I'd like a recommendation for a PCIE 3 card that is:

1. Good for editing with VRD (duh).

2. Cheap--not much over $150, as the RAM upgrade has already punched one hole in my very tight finances. This will mean I have to buy used, but as the system is in its last years anyhow, that's OK.

3. Standard PCI height, not taller. It can be thicker--I don't have a sound card, so if the graphics card overlaps another PCIE slot, no big deal. But the card can't be taller than normal because it'll run into my side fan.

So will a dedicated consumer graphics card solve or reduce my lag woes, and if so, what are some possibilities?
 

jmc

New member
#2
I believe one of the Devs stated here that GPU decoding was removed
and the h.264 decoding for scrolling is CPU only.

When I tested mine (scrolling rapidly with a HD H264.MP4 file) there
was ONLY an increase with the CPU activity. No increase in GPU usage.

I find MPG scrolling to be fine. But the H264.mp4 scrolling is a bit of a pain.

Only GPU compressing might benefit from a new videocard.
 

Danr

Administrator
Staff member
#3
The main question you need to answer for H264 scrubbing (scrolling) is how large are the GOPs. If they are very large, more than 2-3 seconds, scrolling will be slow, because it has to decode so much to display a frame. When you use the main slider, it only scrolls to I-frames so it should be nearly instant. It's only when positioning to frames between GOPs that scrolling can take a while. Is this what you're seeing?

The main quesiton is how large are the GOPs? Do an I-frame to I-frame navigation and measure the number of seconds between them.

Version 6, has a number of performance enhancements to improve scrolling in the presence of large GOPs. We are also looking at whether or not GPU decoding will improve performance. May know more in about a week, as that's just being looked at now. If you're interested in a low-cost GPU card, we are doing our testing with an NVidia GTX 1050. It's less than $150, comes in a full and half-height configurations. All the GPU cards are double width, mostly because of the heatsinks and fans.
 
#4
the H264.mp4 scrolling is a bit of a pain.
Thx jmc for the moral support.

When you use the main slider, it only scrolls to I-frames so it should be nearly instant.
Sure, but that's only useful for zipping up or down the video to find roughly the spot you want. Most of the work is perforce done with the fine-tuning slider, and it's laggy.

It's only when positioning to frames between GOPs that scrolling can take a while. Is this what you're seeing?
I assume so. The fine-tuning slide is never instantaneous, at least re the thumbnails, and that's what counts. What I want is for the the thumbnails to be perfectly synchronized with the fine-tuning slider. As of now, the thumbs are nicely synchronized with the main slider--not quite perfect, but the lag is at a mere fraction of a second, a quibble not worth complaining about. But the fine-tuning slider lags a great deal more--and the fine-tuning slider in conjunction with the thumbnails is where I find myself doing all the real work.

The main quesiton is how large are the GOPs? Do an I-frame to I-frame navigation and measure the number of seconds between them.
Depends on the video. When the broadcaster compressed the double-toothpicks out of the file (at least I assume that's the problem), it'll be around two seconds. For normal videos, about one. I don't have a precise stopwatch timer, and in any case my reaction time for pressing the button at the instant when the thumbnails catch up to the slider is not instant itself, so I can't be perfectly precise. But while some videos are better than others, on none of them does the fine-tuning slider ever deliver the near-perfect synchronization with the thumbnails that the main slider does. And when you're trying to cut that one single F-bomb so you can watch a movie with your kid, the main slider is no help whatsoever.

If you're interested in a low-cost GPU card, we are doing our testing with an NVidia GTX 1050.
If it turns out that V6 plus the GTX 1050 will solve the synch problem between the fine-tuning slider and the thumbnails, that would be awesome. I'd be most grateful if you could post back here with the results of your test next week.
 
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