Rinu Posted August 20, 2021 Report Share Posted August 20, 2021 Hello everyone In the below video both are outputs from arena to watchout as capture left is blackmagic ndi capture at 1080p at 30hz and right is ndi capture. How can avoid the latency in ndi and the small glitch in the blackmagic capture VID_20210820_145028.mp4 Quote Link to comment Share on other sites More sharing options...
Rinu Posted August 20, 2021 Author Report Share Posted August 20, 2021 Hello everyone In the below video both are outputs from arena to watchout as capture left is blackmagic ndi capture at 1080p at 30hz and right is ndi capture. How can avoid the latency in ndi and the small glitch in the blackmagic capture VID_20210820_145028.mp4 Quote Link to comment Share on other sites More sharing options...
Rinu Posted August 21, 2021 Author Report Share Posted August 21, 2021 Waiting for your response Quote Link to comment Share on other sites More sharing options...
Dataton Partner RBeddig Posted August 22, 2021 Dataton Partner Report Share Posted August 22, 2021 Maybe you should be a bit more specific. When talking about a Blackmagic device, I would assume that you're talking about a capture card which takes your source signal (e.g. HDMI) and feeds this into the computer over PCIs slots or USB? You're talking about On 8/20/2021 at 1:12 PM, Rinu said: blackmagic ndi capture at 1080p at 30hz We stopped using Blackmagic devices quite some years ago due to the total lack of support and the quality of their drivers. Therefore I actually can't say whether there is a Blackmagic NDI encoder/decoder on the market or not. NDI is a signal traveling through the network, usually encoded by some hardware encoder but sometimes also encoded by the source device itself. Trying to use video signals coming into physical inputs of a capture card and signals using NDI encoding will most probably end up in a lack of synchronization. Encoding and decoding video signals to/from NDI usually leads to appr. 1 frame delay since the encoder has to analyze, compress and repack the incoming stream into the NDI format. When we measured the difference between signals going directly into a Datapath capture card and those from the same source going through a fast NDI converter into WATCHOUT, we measured 1 frame difference. On other servers with different capture cards we even saw that the NDI signal was a frame faster than the captured signal. If the signal needs to be changed in the frame rate or resolution, the delay can even be noticeably longer. If you compare, you should use the same frame rate and resolution on the source side and in WATCHOUT. Then you can measure whether the capture card is faster (which is probably the case) and how much faster it is. Adding frame rate conversions or scaling will usually lead to more latency and this will be different on a capture card or the NDI encoding process. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.