I just leaned about a very valuable feature of mplayer: you can graphically determine the crop region with -vf rectangle!<\/p>\n
To do so, create a new config file with this:<\/p>\n
RIGHT change_rectangle 2 10\r\nLEFT change_rectangle 2 -10\r\nUP change_rectangle 3 -10\r\nDOWN change_rectangle 3 10\r\nKP6 change_rectangle 0 10\r\nKP4 change_rectangle 0 -10\r\nKP8 change_rectangle 1 10\r\nKP2 change_rectangle 1 -10<\/pre>\nThen view the movie with<\/p>\n
$ mplayer -vf rectangle\u00a0-input conf=<\/path\/to\/conf> <movie_file><\/pre>\nYou’ll see a white rectangle in the view area. Change the size with the keypad and the position with the cursor keys. The keypad down key\u00a0enlarges the height, keypad down reduces it. Keypad left reduces the width, keypad right enlarges it.<\/p>\n
Once you’re done, quit mplayer and use the rectangle geometry as crop parameter for ffmpeg:<\/p>\n
$ ffmpeg -vf crop=<rectangle_data> ...<\/pre>\nSplitting<\/h3>\n
Splitting isn’t as easy as it seems. You need 2 parameters:<\/p>\n
The latter is not<\/strong> a position in the file, but a duration! So, if you want to cut out everything from position 00:33:42 to 00:46:43, use -ss 00:33:42 -t 00:13:01 (33:42 + 13:02 = 46:43).<\/p>\n Also, -ss is a positional parameter. Use it as an input parameter, i.e. before<\/strong> -i if you don’t want silence and a black screen up front!<\/p>\n Split out 13:02 minutes from position 33:42:<\/p>\n Use the rectangle feature:<\/p>\n Reencode the split movie to mkv with the rectangle data:<\/p>\n Cropping I just leaned about a very valuable feature of mplayer: you can graphically determine the crop region with -vf rectangle! To do so, create a new config file with this: RIGHT change_rectangle 2 10 LEFT change_rectangle 2 -10 UP change_rectangle 3 -10 DOWN change_rectangle 3 10 KP6 change_rectangle 0 10 KP4 change_rectangle 0 -10 … Continue reading How to crop and split a movie<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[78],"tags":[64,48,65,66],"class_list":["post-253","post","type-post","status-publish","format-standard","hentry","category-transcoding","tag-crop","tag-ffmpeg","tag-mplayer","tag-split"],"_links":{"self":[{"href":"https:\/\/tollana.d-tor.org\/notes-to-self\/index.php?rest_route=\/wp\/v2\/posts\/253","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tollana.d-tor.org\/notes-to-self\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tollana.d-tor.org\/notes-to-self\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tollana.d-tor.org\/notes-to-self\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tollana.d-tor.org\/notes-to-self\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=253"}],"version-history":[{"count":2,"href":"https:\/\/tollana.d-tor.org\/notes-to-self\/index.php?rest_route=\/wp\/v2\/posts\/253\/revisions"}],"predecessor-version":[{"id":255,"href":"https:\/\/tollana.d-tor.org\/notes-to-self\/index.php?rest_route=\/wp\/v2\/posts\/253\/revisions\/255"}],"wp:attachment":[{"href":"https:\/\/tollana.d-tor.org\/notes-to-self\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=253"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tollana.d-tor.org\/notes-to-self\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=253"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tollana.d-tor.org\/notes-to-self\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=253"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Example<\/h3>\n
$ mplayer -ss 00:33:42 -t 00:13:02 -i <source> -acodec copy -vcodec copy out.file<\/pre>\n
$ mplayer -vf rectangle -input conf=<\/path\/to\/conf> in.file<\/pre>\n
$ ffmpeg -i <in.file> -acodec copy -vcodec\u00a0libx264 -preset slow -threads 0 -x264opts fast_pskip=0:crf=21 <out.mkv><\/pre>\n","protected":false},"excerpt":{"rendered":"