That's cool, if it doesn't do it it doesn't do it. So close yet so far!
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| Is this the answer to an HDMI genlock? https://forum.lddb.com/viewtopic.php?f=50&t=9699 |
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| Author: | teddanson [ 15 Mar 2021, 11:52 ] |
| Post subject: | Is this the answer to an HDMI genlock? |
So there's an FPGA board entitled neTV (an neTV2 board is out too but significantly more expensive). It allows you to overlay data on to an HDMI signal. It mentions subtitles being a built in application in the kit. https://www.adafruit.com/product/609 There's a demo video here: https://kosagi.com/netv/netv_demo1.mp4 Having looked at it a bit closer, I think this could well be an answer for overlaying subtitles to Laserdiscs, VHS etc on the assumption you are running said source(s) through a scaler or some other kind of device that will output your composite/svideo/scart source to HDMI. I'm keen to drop the Euro on it but hesitant in case I missed something and this doesn't do what i think it's capable of doing. Any other eggheads think this may do the job? |
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| Author: | admin [ 15 Mar 2021, 14:04 ] |
| Post subject: | Re: Is this the answer to an HDMI genlock? |
teddanson wrote: I'm keen to drop the Euro on it but hesitant in case I missed something and this doesn't do what i think it's capable of doing. Any other eggheads think this may do the job? The most important feature of a genlock is the capability of being transparent when letter pixels don't need to be displayed. Maybe I missed something but this device only seems to placate sections of video (rectangles, basically) into the HDMI video stream. Unless your subtitles obstruct the background with a non-transparent black rectangle, I don't see how this device can gracefully insert subtitles. It seems more relevant to display current information inside airports or hospitals displays, while playing a video in loop in the background. Julien |
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| Author: | rcarlson [ 15 Mar 2021, 14:15 ] |
| Post subject: | Re: Is this the answer to an HDMI genlock? |
Their description does say, "Inside, it's an Angstrom linux box running Webkit that features chroma-key video compositing," which to me suggests it could be capable of displaying subtitles gracefully. I think most of the workload would be in making timing the video and subtitle tracks as easy as possible. Color me interested, though. EDIT: Quote: It mentions subtitles being a built in application in the kit. I missed it; where does it mention this? |
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| Author: | teddanson [ 15 Mar 2021, 15:13 ] |
| Post subject: | Re: Is this the answer to an HDMI genlock? |
Ah apologies, faux pas on my part. From the blog of the creator: "NeTV classic mode thus enables applications such as subtitles and pop-up notifications by throwing away regions of source video and replacing it entirely with overlay pixels." https://www.bunniestudios.com/blog/?cat=17 |
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| Author: | admin [ 15 Mar 2021, 15:21 ] |
| Post subject: | Re: Is this the answer to an HDMI genlock? |
teddanson wrote: "NeTV classic mode thus enables applications such as subtitles and pop-up notifications by throwing away regions of source video and replacing it entirely with overlay pixels." It does mention overlaying PIP (picture in picture) but I have yet to find a mention/example for transparency in the overlay'ed video. Julien |
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| Author: | teddanson [ 15 Mar 2021, 15:32 ] |
| Post subject: | Re: Is this the answer to an HDMI genlock? |
That's cool, if it doesn't do it it doesn't do it. So close yet so far!
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| Author: | rcarlson [ 15 Mar 2021, 15:37 ] |
| Post subject: | Re: Is this the answer to an HDMI genlock? |
I wouldn't give up hope just yet; it may simply require additional software development effort. It's all open source, so why not? |
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| Author: | teddanson [ 15 Mar 2021, 15:43 ] |
| Post subject: | Re: Is this the answer to an HDMI genlock? |
I wouldn't know where to start. Might be something on Github maybe already attempted? If it worked out of the box I'd give it a try. Maybe a serious egghead will see this and try to do it. I wish them the best of luck, and if it works, take my money! 
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| Author: | admin [ 15 Mar 2021, 15:57 ] |
| Post subject: | Re: Is this the answer to an HDMI genlock? |
I found one mention of chroma-key for NeTV2 here: https://www.crowdsupply.com/alphamax/ne ... d-open-way But the examples all overlay full rectangles, no inner transparency I could find. Maybe here: https://github.com/AlphamaxMedia/netv2- ... Colorspace Julien |
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| Author: | jojjelito [ 20 Mar 2021, 14:49 ] |
| Post subject: | Re: Is this the answer to an HDMI genlock? |
I keep dreaming of a box that can overlay the transparent subtitles rendered in 720 or 1080. It looks like one of the SingMai boxes can do this, albeit using HD-SDI instead of HDMI: https://www.singmai.com/modules.html I also found a box like the Datavideo TC-100, but adding captions requires a PC running software. So far the NeTV-2 looks like best bet. Of course I can keep using my s-video CC decoder, but the aspiration was to use the data slicer on the eval board inside the AD7842 to output CC over serial, the render that in antialiased HD for a nicer look. |
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