> Andrea,
>   Do you think we should try to add some of Igor's information to the manual? MKV seems to have a lot of differences that cause issues because it is an Open Standard and can be used anyway (as opposed to MP4 which is not for free commerical use).

@Phyllis
OK, I try to write a draft. Can you all check if it is correct or can
be improved?
@IgorBeg
How do you see the I-frames of a media? I have only found one ffprobe
command, but it is not convenient to use. Do you have any resource to
elaborate on the problems of seeking mkv?