Your player probably won't like it but YouTube will. YouTube accepts just about anything so these commands use a few tricks to make encoding faster, or make the file size small, and to keep quality high because YouTube will re-encode whatever you give it. ffmpeg -loop 1 -framerate 1 -i image.jpg -i music.mp3 -c copy -shortest output.mkv It's super fast, but if size is important than the method above may produce a smaller file. This method just stream copies (no encoding) the image into the MKV container. c:v libx264 -preset veryslow -crf 0 -c:a copy -shortest output.mkv ffmpeg -loop 1 -framerate 1 -i image.jpg -i music.mp3 \ It is slower than the stream copy method below, but potentially will output a smaller file size. This method uses libx264 to encode H.264 video. For uploading to YouTube H.264: smallest files
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