Picking up SSTV from Space Station using Goonhilly WebSDR

For picking up SSTV signals from Space Station, you have to find the time when the space station is over the Goonhilly Earth Station. Method was described in a video yesterday (Can you receive SSTV from Space Station using a WebSDR?). Though good signals were recorded, decoding was not good, may be because I could not track Doppler.