I am writing audio content to a m4a file with ExtAudioFileWriteAsync and it is working perfectly. However, I would also like to add meta data to the exported file.
Is this at all possible? If so, how?
Any help would be much appreciated.
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I don't think you can with ExtAudioFile, but maybe with AudioFile's `kAudioFilePropertyInfoDictionary`. – Rhythmic Fistman Apr 15 '15 at 06:06
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No, doesn't work like that, I simply cannot set that property, it throws me an error saying "The operation couldn't be completed." – Lehel Medves Apr 15 '15 at 07:27
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I think that leaves only AVAssetExportSession – Rhythmic Fistman Apr 15 '15 at 07:31
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Indeed, thank you very much for your feedback and idea, I'll do it with AVAssetExportSession, no way around it – Lehel Medves Apr 15 '15 at 07:37
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I ended up doing it with AVAssetExportSession, loaded the file I am trying to edit into an AVURLAsset, adding the metadata to the export session, then saving the export.
Lehel Medves
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Another 22 hours and I can :) there is a limitation for accepting your own answer. – Lehel Medves Apr 16 '15 at 06:36