Sometimes I would want to convert from MPEG-TS H.264 to DVD video format, or other conversions, so there are reasons to do so. However, once I had got desynchronized audio, and I don't know if that is because of the original source, because of the conversion, or because some segments have not been recorded. (Also, it could not retain the EIA-608 captions, but that seems to be a limitation with FFmpeg, rather than something I did.)