avmutablecomposition - AVFoundation concatenating videos -

i pulling hair out on this.

i try concatenate videos , won't want do. specifically, have videos have different orientation , try set right layer instruction. alas, not matter try, has no effect...

i read every tutorial, tried implement aplcompositiondebugview provided apple (which looks ok), no avail... i'm ready throw overboard...

here's code:

self.videocomposition = [avmutablevideocomposition videocomposition]; self.videocomposition.rendersize = cgsizemake(480, 320); self.videocomposition.frameduration = cmtimemake(1, 30);  nsmutablearray *videocompositioninstructions = [[nsmutablearray alloc] init];  avmutablecomposition *themutablecomposition = [avmutablecomposition composition];  avmutablecompositiontrack *compositionvideotrack = [themutablecomposition addmutabletrackwithmediatype:avmediatypevideo preferredtrackid:kcmpersistenttrackid_invalid]; avmutablecompositiontrack *compositionaudiotrack = [themutablecomposition addmutabletrackwithmediatype:avmediatypeaudio preferredtrackid:kcmpersistenttrackid_invalid]; avmutablevideocompositionlayerinstruction *passthroughlayer = [avmutablevideocompositionlayerinstruction videocompositionlayerinstructionwithassettrack:compositionvideotrack];  cmtime titleduration = cmtimemakewithseconds(5, 600);  cmtimerange titlerange = cmtimerangemake(kcmtimezero, titleduration);  [compositionvideotrack insertemptytimerange:titlerange]; [compositionaudiotrack insertemptytimerange:titlerange];  cmtime insertpoint = [[transitiontimes lastobject] cmtimevalue];  cmtime totaltime = cmtimemakewithseconds(5, 600);  for(nsdictionary *clip in collection[@"clips"]){      nsstring *moviename = [nsstring stringwithformat:@"collection_%li/recording_%li_%li.mov", (long)editcollection, editcollection, [clip[@"clipid"] longvalue]];      nsurl *asseturl = [nsurl fileurlwithpath:[usefulstuff pathforfile: moviename]];      avurlasset *videoasset = [avurlasset urlassetwithurl:asseturl options:nil];      totaltime = cmtimeadd(totaltime, videoasset.duration);      avassettrack *clipvideotrack = [[videoasset trackswithmediatype:avmediatypevideo] objectatindex:0];     avassettrack *clipaudiotrack = [[videoasset trackswithmediatype:avmediatypeaudio] objectatindex:0];      nserror *error;      [compositionvideotrack inserttimerange:clipvideotrack.timerange oftrack:clipvideotrack attime:insertpoint error:&error];    // add video     [compositionaudiotrack inserttimerange:clipvideotrack.timerange oftrack:clipaudiotrack attime:insertpoint error:&error];    // add audio      [passthroughlayer settransform:clipvideotrack.preferredtransform attime:insertpoint]; ////// should supposedly set video in right orientation @ given time...       insertpoint = cmtimeadd(insertpoint, videoasset.duration);  }  avmutablevideocompositioninstruction *passthroughinstruction = [avmutablevideocompositioninstruction videocompositioninstruction]; passthroughinstruction.timerange = cmtimerangemake(kcmtimezero, totaltime);  nslog(@"total time b %f", cmtimegetseconds(totaltime));  passthroughinstruction.layerinstructions = [nsarray arraywithobject:passthroughlayer]; [videocompositioninstructions addobject:passthroughinstruction];  self.videocomposition.instructions = videocompositioninstructions; 

heeeeeeelp! :)

i don't see in posted code deals orientation problem. need transform in layerinstruction make orientation same.

try this:

avmutablecomposition *composition = [avmutablecomposition composition]; avmutablecompositiontrack *compositionvideotrack = [composition addmutabletrackwithmediatype:avmediatypevideo preferredtrackid:kcmpersistenttrackid_invalid];  avmutablevideocomposition *videocomposition = [avmutablevideocomposition videocomposition];  videocomposition.frameduration = cmtimemake(1,30);  videocomposition.renderscale = 1.0;  avmutablevideocompositioninstruction *instruction = [avmutablevideocompositioninstruction videocompositioninstruction];  avmutablevideocompositionlayerinstruction *layerinstruction = [avmutablevideocompositionlayerinstruction videocompositionlayerinstructionwithassettrack:compositionvideotrack];  // paths user selected nsmutablearray *array = [nsmutablearray array]; for(nsstring* string in videopatharray){     if(![string isequaltostring:@""]){         [array addobject:string];     } } self.videopatharray = array; float time = 0;  (int = 0; i<self.videopatharray.count; i++) {      avurlasset *sourceasset = [avurlasset urlassetwithurl:[nsurl fileurlwithpath:[videopatharray objectatindex:i]] options:[nsdictionary dictionarywithobject:[nsnumber numberwithbool:yes] forkey:avurlassetpreferprecisedurationandtimingkey]];      nserror *error = nil;      bool ok = no;     avassettrack *sourcevideotrack = [[sourceasset trackswithmediatype:avmediatypevideo] objectatindex:0];    cgsize temp = cgsizeapplyaffinetransform(sourcevideotrack.naturalsize, sourcevideotrack.preferredtransform);     cgsize size = cgsizemake(fabsf(temp.width), fabsf(temp.height));     cgaffinetransform transform = sourcevideotrack.preferredtransform;      videocomposition.rendersize = sourcevideotrack.naturalsize;     if (size.width > size.height) {          [layerinstruction settransform:transform attime:cmtimemakewithseconds(time, 30)];     } else {         float s = size.width/size.height;          cgaffinetransform new = cgaffinetransformconcat(transform, cgaffinetransformmakescale(s,s));          float x = (size.height - size.width*s)/2;          cgaffinetransform newer = cgaffinetransformconcat(new, cgaffinetransformmaketranslation(x, 0));          [layerinstruction settransform:newer attime:cmtimemakewithseconds(time, 30)];     }     ok = [compositionvideotrack inserttimerange:sourcevideotrack.timerange oftrack:sourcevideotrack attime:[composition duration] error:&error];      if (!ok) {             // deal error.         nslog(@"something went wrong");     }      nslog(@"\n source asset duration %f \n source vid track timerange %f %f \n composition duration %f \n composition vid track time range %f %f",cmtimegetseconds([sourceasset duration]), cmtimegetseconds(sourcevideotrack.timerange.start),cmtimegetseconds(sourcevideotrack.timerange.duration),cmtimegetseconds([composition duration]), cmtimegetseconds(compositionvideotrack.timerange.start),cmtimegetseconds(compositionvideotrack.timerange.duration));      time += cmtimegetseconds(sourcevideotrack.timerange.duration);  }  instruction.layerinstructions = [nsarray arraywithobject:layerinstruction]; instruction.timerange = compositionvideotrack.timerange;   videocomposition.instructions = [nsarray arraywithobject:instruction]; 

i have taken code here because works me every time. have make resulting transform according requirement.