You will need to use the "netto ts bitrate" as this is in Mbps we need to multiply this by 1000000 to get bps for both the muxrate and bitrate, for the FFVBitrate (video bitrate) we need to multiply by 0.0006 and just round up to a whole number. Use this site to work out your own choice of SR/FEC combinations. You can now duplicate this profile and rename them to suit your own choice of SR/FEC combination, I have and For each profile you will need to change the muxrate, bitrate and FFVBitrate (video bitrate) values for your given choice of SR/FEC, this can be done from the settings, output (advance), recording or the ini file.
Within that window you will see a file basic.ini, replace it with the file contained in the zip file below. With OBS running click on the profile tab and then rename the default profile to click on the file tab and go to show the profile folder. Once you have set the Portsdown up and can confirm the network is working, you need to set up OBS. I set the Portsdown up with a fixed IP of 10.0.0.1 by adding the text ip=10.0.0.1 to the cmdline.txt file found in the root of your SD card. You will need to setup the Portsdown to talk to your PC via a network cable, WiFi wont work reliably. It is also useful to have VLC on the PC for testing, make sure you download the correct one for your system ie 64bit/32bit this will be important for later use with OBS - Hardware Once downloaded copy all the files in the ffmpeg-4.0.2-pthreads folder to C:/ffmpeg and over write the original files. You can download the files from here Download. If you are using a Windows PC then you will need to change some files to ones compiled with pthreads as the w32thread compiled files will cause instability problems with your UDP stream. The program interfaces in to the Portsdown over a wired network connection via an ffmpeg script developed by Evariste F5OEO.Īs well as downloading OBS (making sure you get the right version for your system ie 64bit/32bit) and ensuring it runs on your PC, you will also need to download ffmpeg from - ffmpeg should then be installed on your PC at C:/ffmpeg. OBS can be used as a fully flexible video source for the Portsdown DATV system. More details on the features and the program download from Using OBS with Portsdown
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