sS ffmpeg_concatVideos(L<File> inVideos, File outVideo) {
  File tempFile = createTempFile();
  saveTextFile(tempFile, print("> ", mapToLines(inVideos,
    f -> "file " + singleQuote(f2s(f)))));

  ret ffmpeg("-f concat -safe 0 -i " + platformQuote(tempFile) + " -c copy -y " + platformQuote(mkdirsForFile(outVideo)));
}