What is the right command line that would do that? copy the audio stream without transcoding it). I don't care very much about what video codec is used for output, but it is vital that I can use "copy" as the audio codec (i.e. I want FFmpeg to take one JPEG image and an audio file as input and generate a video file of the same duration as the audio file (by stretching the still image for the whole duration). This should be pretty trivial, but I can't find a way to get it to work.
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