Might be helpfull to post your system specs.

Gpu can help with the decode of the multiple streams. But you need a decent gpu that performs well under vegas.

Disk IO needs to be able to keep up with the multiple streams.

Max your system memory with like 16-32GB might help with better disk cache, and keeping the cpu fed.

Running a test with all your source footage converted to XDCAM-EX could help with multiple stream playback as well.

Thanks for replying
The cameras are a sony Nx70e and a nex ea50e
Not sure if it helps but they play perfectly on VLC and in the cameras.

sysyme specs are

I7 Haswell
16gb ram
radion 6850
Os Drive and media drive are both SSD

As astar suggested, do a multicam test with a couple files converted to XDCAM. Certain codecs require a lot of CPU power to play well.

Im just converting a couple of files now, I have just noticed it dosnt seem to be in multi cam anymore seems to be doing the same just on a single video track.

Ok so that seems to be better after converting to XDCAM. What would you guys deduce from that?

What is the frame rate of your source files? What GPU do you have?

25fps and the gpu is a radion 6850

You can monitor GPU with gpu-z or "amd system monitor" When the time line is at speed, you should be seeing the gpu being used, but not nessesaryily at 100%. In fact you should not see more than about 50-75% for smooth playback. 75%+ gpu while playback, and you most likely need a stronger gpu.

I would verify that the GPU is interfacing the motherboard at 16x speed and not 4 or 8x. Most systems will knock the pcie bandwidth in half if you have an add on board in a wrong slot. You want maxImum bandwith path between memory, cpu, and gpu. The 1st page of gpu-z will tell you the interface speed, when you roll your mouse over the slot speed.

Since your running a haswell processor, dumping the 6850 for a 7970 or r9 290x would allow you to use pcie 3.0 interface on your motherboard. Pcie 3.0 has much greater bandwidth and much less communication overhead. The 7970ghz and 290x would have have more than 2x the compute crunch power of the 6850.

Putting cameras on individual media drives would optimize further, since there would be less competition for drive access time.

One last thing to check would be DPC Latency. Google DPC Latency Checker. The DCP latency of the machine should not be running in the red, nor should you be seeing spikes into red. You should be seeing a relatively flat, continuous line in the 500(Green) to 1500(yellow.) If you see spikes that repeat on interval, or mainly red indicators across the board, then you have a system driver that needs to be disabled / updated to remedy the problem.

LatencyMon - is another more complex view
Windows Performance Analyzer - also offers this view under Computation.

Ok so here is the odd thing that has slightly blown my tiny mind, Vegas is behaving fine this morning premier is still dropping frames. I have used GPU-z and amd system monitor and they are both flat lining 0% on the GPU? although amd shows the odd spike, Im not sure that can be a good thing, can it? Im just going to check the rest of your ideas.

Thank you all for taking the time to help me by the way, you have no idea how stressed this has got me. Everything was working fine and I was just editing the best wedding we have filmed everything was right on the day perfect lighting alday ect, I knew something had to bite me lol.


EDIT: So after running vegas for a while I noticed it start to skip frames again GPU was peaking around 20% but CPU was up around 90% +

Edit: Just checked the cpu temps and im running at 100C!!

mattc7

Are you running on an air cooler? If you get that high temps the CPU will throttle down and that could be the cause of your dropped frames.