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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Epic dropping frames during record

T

Tyrel Stumpff

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Over the last few weeks our Epic has been dropping frames during recording. I thought this was just a monitoring issue but I popped it in the SSD reader and played it back in RCX and the dropped frames where there. Any ideas? I've used different cards with same issue.
 
Tyrel, contact your Bomb Squad rep or if you aren't an owner contact support here: http://www.red.com/contact_us

For this type of error they may ask for you to create a log file to send over. You may want to get that ready.
 
Tyrel ,are you running anything out of the HDMI port on the EPIC?
 
Tyrel, pull that out and try without the wireless transmitter. I had the same issue. No dropped frame issues but would get a stutter in the footage that was reflected on the red mag. Try pulling the wireless transmitter out and testing it out. I am 99% sure your problem will go away.
 
cool, let me know if it works.
 
Hey guys. We were seeing a similar issue with a Paralinx connected directly over HDMI. We don't seem to have any issues with wireless connected via HD-SDI, but with HDMI + Paralinx we're seeing a stutter that doesn't read as drop frames, but is present in the RAW. I'll be contacting RED directly with log info, but avoiding the HDMI seems to have fixed the issue thus far.
 
Make sure you HD-SDI output frequency and LCD/EVF frequencies matches your camera timebase - sort of remember another thread mentioning some issue there.
 
I had this issue when my Paralinx was connected but not powered. Disconnecting the Paralinx or powering it resolved the skipping. I was told that HDMI messages were spamming and causing the frame drop. The data was well and truly lost, so the best I could do with the footage was use Twixtor to interpolate the (generally four) missing frames. Definitely unfortunate.
 
Robert Cook said:
Matthew, what HDMI wireless system were you using?
Click to expand...

It was a Paralinx. I was on the shoot with Matt. We thought is was a brain issue, so we swapped out for another brain, got it all rigged up, and *boom*, dropped frames. I have no idea why anything plugged into the HDMI port on the Epic should be able to affect what's being recorded, but that's what was happening. I've also seen the Epic's touch screen freak out when I plugged a hard line HDMI cable into a television (different body on a different shoot). I just avoid using the Epic's HDMI all the time now.
 
Kyle Wright said:
It was a Paralinx. I was on the shoot with Matt. We thought is was a brain issue, so we swapped out for another brain, got it all rigged up, and *boom*, dropped frames. I have no idea why anything plugged into the HDMI port on the Epic should be able to affect what's being recorded, but that's what was happening. I've also seen the Epic's touch screen freak out when I plugged a hard line HDMI cable into a television (different body on a different shoot). I just avoid using the Epic's HDMI all the time now.
Click to expand...


Got word from a RED tech support rep that in 3.3.15 there were some issues with Paralinx and other 3rd party wireless video. Apparently it's been solved in 4.0.10 - what firmware were you guys on when you saw this?
 
Sidney L. Plaut said:
So to be absolutely sure I read this correct - If you used the HDMI port on build 3.3.15 it could cause dropped frames on the RAW files recorded on the RED MAG SSD?
Click to expand...

According to the RED rep, it was a problem on build 3.3.15 with the Paralinx and some other (unnamed) 3rd party wireless video senders. There was no specific mention of the HDMI port, but for us it only happened to be an issue with that type of video connection. With HD-SDI wireless boxes we didn't have any issues. But that's just anecdotal evidence, so take it for what it is.

The issue would appear as a dropout in the wireless video signal - but there would also be a cluster of missing frames that don't register as dropped frames in the actual RAW footage on the SSD. Like a small ellipse in time.
 
Kyle Wright said:
It was a Paralinx. I was on the shoot with Matt. We thought is was a brain issue, so we swapped out for another brain, got it all rigged up, and *boom*, dropped frames. I have no idea why anything plugged into the HDMI port on the Epic should be able to affect what's being recorded, but that's what was happening. I've also seen the Epic's touch screen freak out when I plugged a hard line HDMI cable into a television (different body on a different shoot). I just avoid using the Epic's HDMI all the time now.
Click to expand...

HDMI has some electronic data "handshaking" signalling (ie data passes in both directions - source and destination devices talk to each other ) which is why it might affect the video paths of the Epic, whereas HD-SDI definitely does not.
 
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