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This is not to say you must pay a lot of money to get a decent USB video capture dongle.
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It is not only the video capture image quality that can be poor, it can also be the frame rate, available capture resolution and the occurrence of many dropped frames as the chipset struggles in its task to convert the analogue TV signal accurately into the digital domain and packetise it for transfer to the host computer. Hence my warning about old chipsets and USB 1.1 data links. In my experience these use the cheapest available chipset and components so do not expect such a unit to provide the best capture performance.
There are some VERY cheap video capture dongles available on eBay etc. Chips that are working hard and getting too hot can misbehave, throttle their speed or even hang.
Some USB TV capture dongles had ventilation slots and that seems a sensible idea to me. Alternatively, some ventilation holes may be added to the original case. If you do a lot of video capture work, there may be justification in fitting a better case to the dongle that provides ventilation. They can get quite hot whilst in use and this does not bode well for longevity. The small USB video capture dongles often have a sealed case and no ventilation. The chip takes video of many types in on one side and spits out USB packets on the other side This thread may help us to identify which chipsets perform well, and which are to be avoided.
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The newer chipsets offer ‘system on a chip’ highly integrated video capture and have made the complex process of capturing video into a PC simple for hardware manufacturers.
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Drivers can become an issue for some older chipsets, especially for Win10. Whilst it may be new and shiny on the outside, it can contain an old and relatively poor performance chipset. It is important to discover the chipset that is used in a USB capture device. USB3.0 is fast enough for demanding tasks. FireWire was an excellent data link for video capture but is now obsolete. Hence why USB 2.0 or better devices are a good idea. Poor transfer rates can lead to dropped frames and sometimes a capture card will reduce capture quality if the USB data rate is poor. It just comes down to the maths of moving all those pixels into the host PC with the overhead of USB packet transfer to be considered. USB 2.0 should be considered a minimum speed and newer USB 3.0 are likely better for higher resolution, high frame rate captures. There are USB 1.1 and USB 2.0 versions commonly available. It was only when I moved to the convenience of USB connectivity that the trouble started ! Some general comments on USB capture devices from my previous experiences. I then moved onto a Pinnacle PCI card and that worked well with no issues. It did what it was supposed to do and, for its time, produced excellent captures. I have ‘played’ with several video capture devices over the years and often found them to be frustrating due to image quality issues, driver instability on particular operating systems or just plain junk that does not work ! My first ever capture solution was the ATI “All In Wonder Pro” combined PC video and capture ISA card. Some information is already available in different threads: Hauppauge WinTV, EzCap, ARCHOS mini PVR, Grandstream GXV3500 EZCap DFG/USB2pro ImmersionRC Power Play FPV DVR Stay tunedĬat, This is a really welcome Post.
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I'll test with NTSC and PAL video from different sources and update the list with links to the devices. Each device will get it's own post with data, test images and video files. In this thread I want to gather different solutions how this signal can be captured.
Most thermal imagers have an analog video output which is often the only signal which can be easily interfaced.