audio - iOS Remove Particular Sound from a video -

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i have application plays audio , records video+audio while sound playing. figure out way process video audio picked microphone removed resulting video.

for example, if i'm playing audioa, , recording videob audiob (from microphone), want somehow cancel out audioa resulting audiob, audiob ambient noise , not noise device speakers.

any idea if there's way this?

bonus points if can done without offline processing.

you have deal playback part. here code mix selected audio recorded video.

- (void)mixaudio:(avasset*)audioasset starttime:(cmtime)starttime withvideo:(nsurl*)inputurl affinetransform:(cgaffinetransform)affinetransform  tourl:(nsurl*)outputurl outputfiletype:(nsstring*)outputfiletype withmaxduration:(cmtime)maxduration withcompletionblock:(void(^)(nserror *))completionblock {     nserror * error = nil;     avmutablecomposition * composition = [[avmutablecomposition alloc] init];      avmutablecompositiontrack * videotrackcomposition = [composition addmutabletrackwithmediatype:avmediatypevideo preferredtrackid:kcmpersistenttrackid_invalid];      avmutablecompositiontrack * audiotrackcomposition = [composition addmutabletrackwithmediatype:avmediatypeaudio preferredtrackid:kcmpersistenttrackid_invalid];      avurlasset * fileasset = [avurlasset urlassetwithurl:inputurl options:[nsdictionary dictionarywithobject:[nsnumber numberwithbool:yes] forkey:avurlassetpreferprecisedurationandtimingkey]];      nsarray * videotracks = [fileasset trackswithmediatype:avmediatypevideo];      cmtime duration = ((avassettrack*)[videotracks objectatindex:0]).timerange.duration;      if (cmtime_compare_inline(duration, >, maxduration)) {         duration = maxduration;     }      (avassettrack * track in [audioasset trackswithmediatype:avmediatypeaudio]) {         [audiotrackcomposition inserttimerange:cmtimerangemake(starttime, duration) oftrack:track attime:kcmtimezero error:&error];          if (error != nil) {             completionblock(error);             return;         }     }      (avassettrack * track in videotracks) {         [videotrackcomposition inserttimerange:cmtimerangemake(kcmtimezero, duration) oftrack:track attime:kcmtimezero error:&error];          if (error != nil) {             completionblock(error);             return;         }     }      videotrackcomposition.preferredtransform = affinetransform;      avassetexportsession * exportsession = [[avassetexportsession alloc] initwithasset:composition presetname:avassetexportpresetpassthrough];     exportsession.outputfiletype = outputfiletype;     exportsession.shouldoptimizefornetworkuse = yes;     exportsession.outputurl = outputurl;      [exportsession exportasynchronouslywithcompletionhandler:^ {         nserror * error = nil;         if (exportsession.error != nil) {             nsmutabledictionary * userinfo = [nsmutabledictionary dictionarywithdictionary:exportsession.error.userinfo];             nsstring * sublocalizeddescription = [userinfo objectforkey:nslocalizeddescriptionkey];             [userinfo removeobjectforkey:nslocalizeddescriptionkey];             [userinfo setobject:@"failed mix audio , video" forkey:nslocalizeddescriptionkey];             [userinfo setobject:exportsession.outputfiletype forkey:@"outputfiletype"];             [userinfo setobject:exportsession.outputurl forkey:@"outputurl"];             [userinfo setobject:sublocalizeddescription forkey:@"causelocalizeddescription"];              [userinfo setobject:[avassetexportsession allexportpresets] forkey:@"allexportsessions"];              error = [nserror errorwithdomain:@"error" code:500 userinfo:userinfo];         }          completionblock(error);     }]; }

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