I have tried vMix on a setup where we had to combine 4 shots into one.
I have the Basic HD version so 4 layers are possible.
I found that when I adjust any setting like positioning an recorded take, (via the "i" button) the program becomes very sluggish. it takes 10s of seconds to react to any button or slider. even opening another recording can take up to a minute.
All the while, the CPU (quad core 3Ghz AMD) are between 5 and 20% per core.

While I succeeded to show the 4 shots combined, the whole process was very tedious and I need to find the cause.

Related issue: The fader does not move smoothly, it disappears when I drag it to one side, sometimes comes back (or not) or jumps back to left. It also can react sluggish.

What I found in during this composition shot is that the first frame of a clip that is shown in the lower row is often the first frame of the clip that was opened BEFORE!
so at one time I had 3 clips open that looked identical, but the moment I made a transition, the frame in the lower row updated to the real image.
That was very confusing because I started to search for clips that were already open but not recognizable.

I am open to all suggestions to improve this.

Rob

Hi Martin,
Thanks for the quick reply.

I am using a Gigabyte GA-880GM-USB3, with the onboard GPU,
there is a 4 core 3Ghz CPU in there.
I am running W7 64bit Ultimate

I am hoping to use this for 1080i capture and playback.
The program looks very promising.

Unfortunately this motherboard has only 1 PCI-Express 16x lane that is occupied with the Decklink Duo card. the other PCI-Express is a 1x slot that can only fit very select cards, due to the onboard GPU build next to it.

When I first installed the program I used 2x Sony EX-3 cameras at 1080i/50 and I could record mjpeg without dropped frames.
But most of the work I do is with Arri Alexa cameras that output also 50i or 25p 1080. But now I see 4-7 dropped frames every second.
The info frame shows that the dropped frames are in the source stream, not in the CPU handling.

CPU Š Hyper Transport Š
AM3+ Socket:
- AMD AM3+ processor
- AMD AM3 PhenomTM II processor/ AMD AthlonTM II processor (Go to GIGABYTE's website for the latest CPU support list.)
5200 MT/s
Bus
Chipset
Memory Š
4 x 1.5V DDR3 DIMM sockets supporting up to 16 GB of system memory
* DuetoWindows32-bitoperatingsystemlimitation,whenmorethan4GBofphysical
Onboard Š Graphics
them in the DDR3_3 and DDR3_4 memory sockets.
(Go to GIGABYTE's website for the latest supported memory speeds and memory modules.)
North Bridge:
- 1 x D-Sub port
- 1 x DVI-D port, supporting a maximum resolution of 1920x1200
* The DVI-D port does not support D-Sub connection by adapter.
- 1 x HDMI port, supporting a maximum resolution of 1920x1200 * Simultaneous output for DVI-D and HDMI is not supported.
Audio Š
Š High Definition Audio
LAN Š
1 x Realtek RTL8111E chip (10/100/1000 Mbit)
Expansion Slots Š
Š 1 x PCI Express x1 slot
Multi-Graphics Technology
Š North Bridge: AMD 880G
Š South Bridge: AMD SB710
memory is installed, the actual memory size displayed will be less than 4 GB.
Š Dual channel memory architecture
Š Support for DDR3 1800 (O.C.)/1333/1066 MHz memory modules
* ToreachDDR31800MHzorabove,youmustinstalltwomemorymodulesandinstall
Realtek ALC889 codec
Š 2/4/5.1/7.1-channel
Š Support for Dolby® Home Theater
Š Support for S/PDIF Out
1 x PCI Express x16 slot, running at x16
(All PCI Express slots conform to the PCI Express 2.0 standard.)
Š 2 x PCI slots
Š Support for ATI Hybrid CrossFireXTM technology
Storage Interface Š
South Bridge:
- 5 x SATA 3Gb/s connectors supporting up to 5 SATA 3Gb/s devices
- 1 x eSATA 3Gb/s port on the back panel supporting up to 1 SATA 3Gb/s
device
- Support for SATA RAID 0, RAID 1, RAID 10, and JBOD

I have the original box right here: AMD X4 640
3.0 GHz True Quad-Core design
2.0 MB total Cache
Socket AM3 w/ Heat Sink Fan

some numbers on that label:

OPN: ADX640WFGMBOX SN: 9R48762E10435

Rob

Hi Martin,

for sure you made it clear that my MoBo is underweight..... That's cool, I can use this computer at home for normal video viewing, not for HD-specialty programs.

Than the next question is, where should I start now.
Due to the character of my work, which is live recording and playback on a film/HD set, I have to consider size and weight as well.

I prefer to use with micro-ATX sized boards because of the smaller case that can be fitted in a - still big - Pelican case, together with a LCD screen.
gigabyte has just come out with a dual Thunderbold MoBo, for i5/i7 processors.
Do I have to look into that direction?

any help appreciated here,

Thanks,

Rob

Ok, that sounds good.
And what about processor? I understand from your remarks that vMix does most of the processing via the GPU, so that is why you want to see a powerful graphic card or unit in the system.
Looking at my current PC, this morning I saw that simple opening a clip and playing back with a fade to another clip often peaks 2 cores to 90+% while the 2 others are around 35%
and in the bottom bar of vMix I sometimes see percentages far higher than 100%, up to 270%!

Any recommendation for a proper CPU?

For the GPU I see that you prefer nVidia, is that for some reason related to the vMix programming?

Thanks for your help Martin, I really appreciate the fast responses.

Rob