<div dir="ltr"><div><div>I very doubt you will manage that with an Arduino... there is a shield that will overlay graphics (rudimentary) over composite video.<br><br></div>Composite video is pretty much a no-no these days, between their artefacts and very low res (575 lines ish)<br><br></div>If you are working to a low budget then your best place to start would probably be an existing computer (needs to be decent) and spend your bucks on a very good graphics card that has 8 outputs (or two graphics cards with four (quad) outputs)<br><div><br></div><div>This is how we put the score screens on podiums on TV quiz shows.<br><br></div><div>You would then write code in something like Visual Basic that would then populate the screens<br><br></div><div>I say 8 outputs as you will need one screen for control and then the other 4 display screens<br><br></div><div>The audio out would come via your sound card / amps / speakers etc<br><br></div><div>This way you will be able to use existing video libs to open your various AVI/MPEG files and send them to the correct destination.<br><br></div><div>This then goes back to your computer - to play four different videos at the same time will require some pretty good hardware, while your graphics cards will do most of the donkey work the computer will have to be fairly decent with plenty of RAM to be able to cope with the data throughput. So fast processors and fast RAM and plenty of it.<br><br></div><div>An ambitious project.<br><br></div><div>On the other hand, depending on the quality required, there is a lot of non HD equipment now coming on the market as old SD studios and OB trucks are closing down.<br><br>There is a lot of kit that can do this sort of thing available on BB List. I have to do the school run now so I don't have time to search for a suitable piece of kit for you right now. <a href="http://www.bblist.co.uk/">http://www.bblist.co.uk/</a><br><br></div><div>I can make enquiries for you if you like.</div><div><br></div><div>Emyr<br><br></div><div><br><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On 1 January 2015 at 15:53, Debi Withers <span dir="ltr"><<a href="mailto:debiwithers@yahoo.co.uk" target="_blank">debiwithers@yahoo.co.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="color:#000;background-color:#fff;font-family:Helvetica Neue-Light,Helvetica Neue Light,Helvetica Neue,Helvetica,Arial,Lucida Grande,Sans-Serif;font-size:13px"><br><div><div>Hello there, <br></div></div><div><br><br></div><div style="display:block"><div style="font-family:Helvetica Neue-Light,Helvetica Neue Light,Helvetica Neue,Helvetica,Arial,Lucida Grande,Sans-Serif;font-size:13px"><div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,Sans-Serif;font-size:16px"><div><div dir="ltr"><br></div><div dir="ltr">I am a new member to this list and am considering joining the Swansea Hackspace fir 6 months next year to realise a project. <br></div><div dir="ltr"><br></div><div dir="ltr">I am writing initially here to get some advice and some indication of how difficult it would be. <br></div><div dir="ltr"><br></div><div dir="ltr">So here is the project: <br></div><div dir="ltr"><br></div><div dir="ltr">I want to make a 'transmission machine' which can simultaneously play back up to 8 channels of digitised media - video, images and audio. <br></div><div dir="ltr"><br></div><div dir="ltr">Ideally the levels will be controlled by an external device, like a mixing desk/ interface, because it is important that people using the machine have the physical experience of controlling the levels - i.e., how loud the audio can played, the clarity of the image. The selections of the digitised files will be made via a laptop.<br></div><div dir="ltr"><br></div><div dir="ltr">Attached to the 8 outputs will be four screens and 1-4 speakers - although all the audio channels will probably be played through one speaker - so comparable to a live mix which plays back multiple audio channels. <br></div><div dir="ltr"><br></div><div dir="ltr">The one complicated thing perhaps is ideally to separate the audio and moving image of the video file so that the audio and image levels can be controlled separately, i.e., turn down the sound but still play the image; turn down the image, still hear the sound.<br></div><div dir="ltr"><br></div><div dir="ltr">I've asked a friend of mine who seems to think this would be possible through Arduino, but I wanted to check in with a local hackspace for advice to flesh out the idea. </div><div dir="ltr"><br></div><div dir="ltr">I've attached a diagram if this helps to explain the idea better. <br></div><div dir="ltr"><br></div><div dir="ltr">I live in Drefach Felindre but could travel to Swansea to work on the circuit if people could help me. I don't quite have the technical expertise to manage it myself! <br></div><div dir="ltr"><br></div><div dir="ltr">I see there is a workshop on 8 Jan but sadly I cannot make this date...<br></div><div dir="ltr"><br></div><div dir="ltr">Many many thanks in advance for your help - <br></div><div dir="ltr"><br></div><div dir="ltr">debi<br></div><br></div> </div> </div> </div> </div></div><br>_______________________________________________<br>
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