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I'm using AVMutableComposition and AVAssetExportSession to composite several discrete audio clips/files together into a single file, similarly to this post but there will be no "video" track. I'd like to give the track some visual appeal using a still image so that when the user plays the clip they don't just see a generic quicktime icon, ideally I'd replace the image with branding or something relevant to the audio content. How would I go about doing it and is there a way to do it without dramatically increasing file size(ie some way to have a really slow framerate or just something so its not generating 30 fps for what is non moving art.) Appreciate any help on this.

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nickthedude
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AVAssetWriter will allow you to create video from a still image. This question provides a great example of how to do so.

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enjayem
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