Many organizations are interested in using live video feeds with their projection system. Here is MediaShout's position on the issue.
MediaShout v2.x and MediaShout v3.5 Express do not offer a live video feature. This was due to the fact that the software was written before the computers could handle data transfers big enough for live video.
Version 3.x and 4.x of MediaShout do offer support for an external source for a video feed and will offer support for "live video", but we don't recommend any software for live video editing.
There will always be a delay when processing external video through hardware. This delay, or latency, is caused by the computer capturing, processing, and re-formatting the video for computer display. The latency of captured video from its arrival in the computer until its arrival on MediaShout's display screen depends on the computer's horsepower, capture device, image quality, etc. But, it's likely to be at least a tenth of a second. In some cases it could be as much as a second if not more. While we'll do everything we can in the programming to minimize latency it will still exist. Depending on what's being passed through the computer and for what purpose, the latency through MediaShout will either be a minor issue or a very big problem.
Live camera for IMAG (Image Magnification):
Latency is a big problem if you're doing IMAG. That's because the audience is seeing and hearing the live person on stage in real time. However, the projected image on the video screen is out of sync by a tenth of a second to a whole second. Even at a tenth of a second the effect is distracting and irritating. It's like watching a film where the soundtrack is totally out of sync with the actors' mouth movements.
VCR, DVD, etc.:
If the player's sound is running through the computer along with the video and the capture device is equipped to keep the two streams in synchronization, then both audio and video will be delayed to the same extent. Therefore, though still delayed, they'll be in sync. If the capture device cannot adjust for this or the sound is running straight to the sound board, the two streams will be out of sync and the audience will experience the same problem as with IMAG.
We believe that passing external sourced video through MediaShout for the purpose of superimposing text is a feature that should be sparingly used as it might distract from worship instead of help enhance it. If someone really wants to superimpose lyrics, verses, or other text over a live camera, there is still only one good way to do it, by using a keyer. If a person wants multiple cameras and other standard video effects and the flexibility that's seen at just about every conference, a video switcher with a keyer is still the only way to go.
For more information about how to implement live video, see our article about Implementing Live Video.