iphone - How to crop the video? -


i want crop video @ particular portion.given height,width,x , y ,i want crop particular region on video.does have idea.

i have done lot of research didn't find fruitful.i tried cropping using gpuimage cropfilter taking time.

i want perform operation quick possible,please suggest me technique or example how it. in advance

you can use avmutablecomposition , avassetexportsession available in avfoundation framework

for more detail visit apple's reference library avmutablecomposition class reference , avassetexportsession class reference

avasset* asset = // create asset source video url  avmutablecomposition *videocomposition = [avmutablecomposition composition];  avmutablecompositiontrack *compositionvideotrack = [videocomposition              addmutabletrackwithmediatype:avmediatypevideo     preferredtrackid:kcmpersistenttrackid_invalid];  avassettrack *clipvideotrack = [[asset trackswithmediatype:avmediatypevideo] objectatindex:0];  avmutablevideocomposition* videocomposition = [[avmutablevideocomposition    videocomposition]retain]; videocomposition.rendersize = cgsizemake(320, 240); videocomposition.frameduration = cmtimemake(1, 30);  avmutablevideocompositioninstruction *instruction =    [avmutablevideocompositioninstruction videocompositioninstruction]; instruction.timerange = cmtimerangemake(kcmtimezero, cmtimemakewithseconds(60, 30) );   avmutablevideocompositionlayerinstruction* transformer =    [avmutablevideocompositionlayerinstruction    videocompositionlayerinstructionwithassettrack:clipvideotrack]; cgaffinetransform finaltransform = // setup transform grows video, causing crop [transformer settransform:finaltransform attime:kcmtimezero]; instruction.layerinstructions = [nsarray arraywithobject:transformer]; videocomposition.instructions = [nsarray arraywithobject: instruction];  cgsize videosize = myvideocomposition.rendersize;  calayer *parentlayer = [calayer layer];  calayer *videolayer = [calayer layer];  nslog(@"%f %f",_playerlayer.frame.origin.x,_playerlayer.frame.size.width);  parentlayer.frame = cgrectmake( 0, 0  , cropsize.x , cropsize.y );  [videolayer setposition:cgpointmake(videolayer.position.x, videosize.height)];  [parentlayer addsublayer:videolayer];   videocomposition.animationtool = [avvideocompositioncoreanimationtool videocompositioncoreanimationtoolwithpostprocessingasvideolayer:videolayer inlayer:parentlayer];  exporter = [[avassetexportsession alloc] initwithasset:savecomposition    presetname:avassetexportpresethighestquality] ; exporter.videocomposition = videocomposition; exporter.outputurl=url3; exporter.outputfiletype=avfiletypequicktimemovie;   [exporter exportasynchronouslywithcompletionhandler:^(void){}];

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