swift - Composing Video and Audio - Video's audio is gone -


my question is, using function below, compose video , audio. want keep video's original sound goes away somehow, not have clue.

i got function this answer

i tried change volumes right after appending avmutablecompositiontracks did not work

for instance;

mutablevideocompositiontrack.prefferedvolume = 1.0 mutableaudiocompositiontrack.prefferedvolume = 0.05

but still, can hear audio file.

the function;

private func mergeaudioandvideo(audiourl: url, videourl: url, completion: @escaping (bool)->void){      let mixcomposition = avmutablecomposition()     var mutablecompositionvideotrack : [avmutablecompositiontrack] = []     var mutablecompositionaudiotrack : [avmutablecompositiontrack] = []     let totalvideocompositioninstruction = avmutablevideocompositioninstruction()      let videoasset = avasset(url: videourl)     let audioasset = avasset(url: audiourl)      mutablecompositionvideotrack.append(mixcomposition.addmutabletrack(withmediatype: avmediatypevideo, preferredtrackid: kcmpersistenttrackid_invalid))     mutablecompositionaudiotrack.append(mixcomposition.addmutabletrack(withmediatype: avmediatypeaudio, preferredtrackid: kcmpersistenttrackid_invalid))     mutablecompositionaudiotrack[0].preferredvolume = 0.05     mutablecompositionvideotrack[0].preferredvolume = 1.0               let videoassettrack = videoasset.tracks(withmediatype: avmediatypevideo)[0]     let audioassettrack = audioasset.tracks(withmediatype: avmediatypeaudio)[0]      {         try mutablecompositionvideotrack[0].inserttimerange(cmtimerangemake(kcmtimezero, videoassettrack.timerange.duration), of: videoassettrack, at: kcmtimezero)         try mutablecompositionaudiotrack[0].inserttimerange(cmtimerangemake(kcmtimezero, videoassettrack.timerange.duration), of: audioassettrack, at: kcmtimezero)     }catch{         print("error#1")     }      totalvideocompositioninstruction.timerange = cmtimerangemake(kcmtimezero, videoassettrack.timerange.duration)      let mutablevideocomposition = avmutablevideocomposition()     mutablevideocomposition.frameduration = cmtimemake(1, 30)     mutablevideocomposition.rendersize = cgsize(width: 1280, height: 720)      //exporting      savepathurl = try! filemanager.default.url(for: filemanager.searchpathdirectory.documentdirectory, in: filemanager.searchpathdomainmask.userdomainmask, appropriatefor: nil, create: true).appendingpathcomponent("merged").appendingpathextension("mov")      let assetexport = avassetexportsession(asset: mixcomposition, presetname: avassetexportpresethighestquality)!     assetexport.outputfiletype = avfiletypempeg4     assetexport.outputurl = savepathurl     assetexport.shouldoptimizefornetworkuse = true      {         try filemanager.default.removeitem(at: savepathurl)     }catch {         print(error)     }      assetexport.exportasynchronously {          switch assetexport.status{         case .completed:             print("completed")             completion(true)         default:             print("failed \(assetexport.error!)")             completion(false)         }     }  }

i figured out. seems avasset loads video holds audio , video separately. can reach them writing``

videoasset.tracks(withmediatype: avmediatypeaudio)[0] //audio of video videoasset.tracks(withmediatype: avmediatypevideo)[0] //video of video(without sound)

so added these lines code , worked! 

var mutablecompositionbacktrack : [avmutablecompositiontrack] = []  mutablecompositionbacktrack.append(mixcomposition.addmutabletrack(withmediatype: avmediatypeaudio, preferredtrackid: kcmpersistenttrackid_invalid))   try mutablecompositionbacktrack[0].inserttimerange(cmtimerangemake(kcmtimezero, videoassettrack.timerange.duration), of: backassettrack, at: kcmtimezero)

there still missing point not know how do, , setting volumes of these audio assets. update answer figure out how.


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