DeckLink SDI 4K dropping/skipping frames
Posted: Sun Jan 21, 2018 8:09 pm
I have a strange issue with a pair of DeckLink SDI 4K cards installed in different workstations.
When I try to capture video from a workstation to the other using Media Express, I get a "Media express could not capture the clip. One or more frames were dropped" error. It may happen after a few seconds or minutes, but it eventually happens.
To test things out, I have created a video with TC burned and have modified one of the code samples to capture the video without drops and I have found that, once in a while, the captured video is repeating one frame, then skipping one. So, when I watch the resulting video, it reads:
...
00:00:15:10
00:00:15:11
00:00:15:12
00:00:15:12
00:00:15:13
00:00:15:15
00:00:15:16
...
So it's repeating frame 00:00:15:12 and skipping frame 00:00:15:14. I don't know if it's the playing or the capturing device, but something fishy is going on. Funny enough, it happens less in 4K25p format than in 1080p50.
I use 10.9.7 drivers on a windows 10 machine with 16GB or RAM and i7-7700 CPU.
I'm at a loss of what may be going on.
When I try to capture video from a workstation to the other using Media Express, I get a "Media express could not capture the clip. One or more frames were dropped" error. It may happen after a few seconds or minutes, but it eventually happens.
To test things out, I have created a video with TC burned and have modified one of the code samples to capture the video without drops and I have found that, once in a while, the captured video is repeating one frame, then skipping one. So, when I watch the resulting video, it reads:
...
00:00:15:10
00:00:15:11
00:00:15:12
00:00:15:12
00:00:15:13
00:00:15:15
00:00:15:16
...
So it's repeating frame 00:00:15:12 and skipping frame 00:00:15:14. I don't know if it's the playing or the capturing device, but something fishy is going on. Funny enough, it happens less in 4K25p format than in 1080p50.
I use 10.9.7 drivers on a windows 10 machine with 16GB or RAM and i7-7700 CPU.
I'm at a loss of what may be going on.