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tony marone  
#1 Posted : Friday, January 28, 2011 11:38:48 AM(UTC)
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Hello,

I tried recording with the Cineform codec for the first time last night. I was using 1920x1080 at medium quality. Had quite a few dropped frames and after 35 min the recording stopped. There was no warning and I had to wait till after the 5 hour program to find this out. The 35 min that was recorded looks great! Has anyone else experienced this? I was recording on the system drive @ 7200rpm if that helps.

Tony
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#2 Posted : Friday, January 28, 2011 11:03:56 PM(UTC)
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Hi Tony,

What are the system specs of the machine you are using?
Under Settings -> Performance the Output Format can be set to UYVY for better performance with CineForm.

How many dropped frames were shown?

Regards,

Martin
vMix
tony marone  
#3 Posted : Saturday, January 29, 2011 3:03:18 AM(UTC)
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Hi Martin,

The machine is an I7-950 with 6 gigs of ram with Win7 ultimate Gigabyte X58A-UD3R. The amount of frames dropped were in the high 10,000s. I am already using UYVY mode.

Tony
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#4 Posted : Saturday, January 29, 2011 4:52:44 AM(UTC)
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At 35 minutes, 10000 would be close to 4 frames per second being dropped.
The i7-950 is more than enough for 1080p, especially with UYVY, so there is definitely an issue somewhere.

1. What is the CPU usage like before and during a recording?
2. What are the video sources, Intensity, HDV, other?
3. Do the frame rates of the inputs match the frame rate in the Recording Setup?
4. Is there a substantial CPU difference between CineForm in Low and Medium quality?

Thanks for any further information you can provide as I would like to get this resolved.

tony marone  
#5 Posted : Saturday, January 29, 2011 5:30:19 AM(UTC)
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Hi Martin,

The CPU usage is 7 to 10% while not recording. When recording it rises to 9 to 13%.
All video sources are blackmagic cards. 2 decklink duos and one intensity pro.
The frame rates of the inputs match exactly the output and recording frame rates 59.94i/29.97p.
I did not try low quality but I can tell you that the difference in CPU from high to medium was insignificant.

Hope this helps,

Tony
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#6 Posted : Saturday, January 29, 2011 7:32:41 AM(UTC)
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Thanks Tony.

I will run some tests to see if anything shows up and let you know.
tony marone  
#7 Posted : Saturday, January 29, 2011 8:53:03 AM(UTC)
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Hey Martin,

More info.
I did another test and this time it ran for 54 minutes before stopping. Perhaps stopping is not the right term because what really happened was it started dropping 30 frames per second! Each second the dropped frame counter incremented by 30, so it gave no indication of stopping except for this. Also up to the 54 minute mark, just a few frames were dropped, such as when I would access a file on the drive or the system would access the drive, probably no more than 200 frames in that 54 minutes. Then bam! every frame was dropped from that point, effectively ending the recording.

I should mention that I am using 64 bit Win 7.

I am still in the Neoscene trial period and would like to get this sorted so I can make a buying decision soon.

Thanks again,

Tony
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#8 Posted : Saturday, January 29, 2011 11:10:59 AM(UTC)
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Hi Tony,

Just ran a test under the following conditions:

Windows 7 32bit with Core i5 and Western Digital Caviar Black 1TB 7200rpm
vMix 2010 8.1
2x Intensity Pro set to 1920x1080 29.97
NeoScene 5 recording at 1920x1080 29.97 at medium quality

I ran the test for 1 hour 10 minutes and couldn't get it to stop. I tried running other programs copying files anything that might disrupt it.
While it dropped frames, it never went anywhere near dropping 30 a second (which is what happens when it stops as you have described)

The test machine has been optimised for vMix, so the following might be helpful:

* Go to Power Options in the Control Panel
* Select High performance and click Advanced Settings
* Turn off display should be set to Never, Put the computer to sleep should be set to Never.
* Go to Change Advanced Power Settings
* Under Hard Disk change "Turn off hard disk after" to zero (never)
* Under Processor power management change Minimum processor state to 100%

There is the possibility of an issue only affecting 64 bit Windows 7, so I will run the same test again on a 64bit Windows 7 soon.

In older versions of vMix the issue could occur if the hard disk could not keep up for an extended period of time. So you could also try setting vMix output size to 1280x720 and recording to see if the same issue occurs.

Regards,

Martin
vMix

tony marone  
#9 Posted : Tuesday, February 1, 2011 11:47:17 AM(UTC)
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Hey Martin,

This problem seems to have been solved by updating the motherboard BIOS to the latest version. I recorded 3 hours without incident, had about 7 dropped frames total.

I noticed that when recording, if I play back a video that is 24fps, I see 6 dropped frames per second for every second that the video plays. This is when I have the system set for 29.97 frames per second. As soon as I go back to a camera input at 29.97fps, the dropped frames stop happening. Why is this?

Thanks for your help!

Tony
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#10 Posted : Tuesday, February 1, 2011 9:39:40 PM(UTC)
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Hi Tony,

Glad to see the issue looks to be solved. I will note down a bios update for other users.
As for the dropped frames, this is normal because the source frame rate is lower than the recording frame rate. In that case those dropped frames represent duplicate frames in the resulting recording.

Regards,

Martin
vMix
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