ios - How to use multiple tracks in an AVMutableComposition -


please see code below. i'm trying add 2nd track have smaller video overlaid on top of background video. can background video display in final exported file. doing wrong? , how control order of tracks, i.e. layering of composition?

    avmutablecomposition* composition = [[avmutablecomposition alloc] init];      nsurl* backgroundurl = [nsurl fileurlwithpath:backgroundoutputpath];             avurlasset* url0 = [avurlasset urlassetwithurl:backgroundurl options:nil];              avmutablecompositiontrack *backgroundvideotrack = [composition addmutabletrackwithmediatype:avmediatypevideo preferredtrackid:kcmpersistenttrackid_invalid];      avassettrack* bgassettrack = [[url0 trackswithmediatype:avmediatypevideo] objectatindex:0];     [backgroundvideotrack inserttimerange:cmtimerangemake(kcmtimezero, [url0 duration])  oftrack:bgassettrack attime:kcmtimezero error:&error];       nsurl* videourl = [[nsbundle mainbundle] urlforresource: @"star" withextension:@"mp4"];      avurlasset* url = [avurlasset urlassetwithurl:videourl options:nil];       avmutablecompositiontrack *compositionvideotrack = [composition addmutabletrackwithmediatype:avmediatypevideo preferredtrackid:kcmpersistenttrackid_invalid];       avassettrack *clipvideotrack = [[url trackswithmediatype:avmediatypevideo] objectatindex:0];      [compositionvideotrack inserttimerange:cmtimerangemake(kcmtimezero, [url duration])  oftrack:clipvideotrack attime:kcmtimezero error:&error];        avassetexportsession *exportsession = [[avassetexportsession alloc] initwithasset:composition presetname:avassetexportpresetmediumquality];       nsstring *exportpath = [documentsdirectorypath stringbyappendingpathcomponent:@"test_av.mp4"];      [[nsfilemanager defaultmanager] removeitematpath:exportpath error:nil];     nsurl *exporturl = [nsurl fileurlwithpath:exportpath];      exportsession.outputurl = exporturl;     exportsession.outputfiletype = avfiletypequicktimemovie;      [exportsession exportasynchronouslywithcompletionhandler:^{         nslog (@"exporting. status %d",                exportsession.status);         switch (exportsession.status) {             case avassetexportsessionstatusfailed:             case avassetexportsessionstatuscompleted: {                 nslog(@"export done");                 break;             }         };     }];

check tutorials.this may helpful you:http://abdulazeem.wordpress.com/2012/04/02/video-manipulation-in-ios-resizingmerging-and-overlapping-videos-in-ios/

http://www.raywenderlich.com/13418/how-to-play-record-edit-videos-in-ios

https://github.com/androidios/aveditdemo


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