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). > I solve this problem by reencoding the video with ffmpeg (it's quite little > in size), but when I do this with mencoder, the video is reencoded, but > there is still no out png file. > The cmd in this case is e.g. > mencoder video.3gp -ovc lavc -nosound -o video.avi . The only error output > with the sample file is: -lavcopts vqscale=2:keyint=1 _______________________________________________ MPlayer-users mailing list MPlayer-users@xxxxxxxxxxxx https://lists.mplayerhq.hu/mailman/listinfo/mplayer-users
