Video issues in dorico

Hi, I was wondering if anyone has a good experience in importing videos into DORICO. I have a score with 2 flows and 2 videos. The first one play perfectly. The second one plays the first second (with the audio) then it suddenly stops. I have tried everything (convert it, export it). I cant figure out why this is not working (as the first video has been converted with the same program) works perfectly. Any suggestion appreciated, thanks!