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ffmpegdoesn't like; it barfs for me with[concat @ 0x10201a200] Impossible to open '/dev/fd/./01 Track.mp3'. I fixed it by making the path to the files absolute:ffmpeg -f concat -i <(printf "file '/path/to/files/%s'\n" *.mp3) -c copy output.mp3"concat:file1.mp3|file2.mp3"instead ofinputs.txt, and then-f concatis unnecessary.concat:file1.mp3|file2.mp3merges the files before sending it to the decoder. It's basically doingcat file1.mp3 file2.mp3 | ffmpeg -i -and thus can lead to decoding errors when the second file differs from the first or the decoder stumbles over header data in the second file. Using-f concatwith a list of files decodes each file on its own and uses the stream only.