Thanks for the link to stackexchange. Reading this post and others (also the discussion on ffmpeg from when they switched from PAR to SAR) I think the formula: "Yet, with DAR = SAR * PAR HDV 1080i: 16/9 = (1440/1080) * (4/3) = 1.7778 HDV 1280p: 16/9 = (1280/720) * (1/1) = 1.7778" is more correct to write it (for ffmpeg and CinGG): DAR = Width/Height * SAR that is, the (4/3) and the (1/1) are now the SAR and not the PAR. So it is no longer spelled PAR, but always just W/H and SAR. SAR, at this point, is a "pixel aspect ratio" I tried changing the txt (version 4). Do you think it is okay? It is likely to be wrong. @Terje For videos, can I ask you to do 2 and 3? I have never used and don't really understand how DVD/BR works; and I haven't had players/burner for a long time.