Nice find on the mkv container. I had the same issue but ended up re-encoding the audio, which is a bit slower but still pretty zippy:
ffmpeg -f concat -i files.lst -c:v copy -c:a aac combined.mp4
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Nice find on the mkv container. I had the same issue but ended up re-encoding the audio, which is a bit slower but still pretty zippy:
ffmpeg -f concat -i files.lst -c:v copy -c:a aac combined.mp4