Reimar Döffinger wrote: > On Fri, Dec 26, 2008 at 11:37:04AM +0300, Igor Katson wrote: > >> I want to extract a png image from lots a videofiles, provided a seek >> point. In 80% of the cases, -vo png does this successfully. >> The cmd in this case is e.g >> >> mplayer video.avi -frames 1 -ss 1 -vo png >> >> But there are files with broken index or smth (here I can't figure out the >> reason), like the one attached, and -vo png does not produce any output. >> Options -idx and -forceidx do not help. The output in this case is e.g. the >> following (if -v turned on): >> > > That video does not contain enough keyframes so seeking forward will seek to to > the end of the video. > You can use e.g. > -vf framestep=30 > and take the file 00000002.png. > Or -vf framestep=I > can be interesting as well since when a good encoder was used this will > result in most pngs being right after a scene change (and possibly also at > better-than-average quality). > > > -lavcopts vqscale=2:keyint=1 > Thanks. So, is it correct, that -ovc lavc and ffmpeg default options just have a different keyint value, and that's why ffmpeg has done the job? _______________________________________________ MPlayer-users mailing list MPlayer-users@xxxxxxxxxxxx https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users
