https://www.nicovideo.jp/cache/sm9.hls.mp4

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例1:
hls to single: sm9[360p,128].hls 新・豪血寺一族 -煩悩解放 - レッツゴー！陰陽師\"'.mp4
hls to single: cannot convert hls to mp4.
hls to single: args: "ffmpeg" "-loglevel" "debug" "-hide_banner" "-allowed_extensions" "m3u8,cmfv,cmfa,key,mp4,m4s,m4a,ts,webm,flv" "-protocol_whitelist" "crypto,tcp,tls,https,file" "-i" "../cache/sm9[360p,128]_新・豪血寺一族 -煩悩解放 - レッツゴー！陰陽師\\"\'.hls/master.m3u8" "-c:v" "copy" "-c:a" "copy" "-id3v2_version" "3" "-metadata" "title=新・豪血寺一族 -煩悩解放 - レッツゴー！陰陽師\\"\'" "-metadata" "comment=sm9[360p,128].hls" "-y" "/tmp/nlHls2Mp4_16145421578022927392.mp4"
hls to single: Splitting the commandline.
hls to single: Reading option '-allowed_extensions' ... matched as AVOption 'allowed_extensions' with argument 'm3u8,cmfv,cmfa,key,mp4,m4s,m4a,ts,webm,flv'.
hls to single: Reading option '-protocol_whitelist' ... matched as AVOption 'protocol_whitelist' with argument 'crypto,tcp,tls,https,file'.
hls to single: Reading option '-i' ... matched as input url with argument '../cache/sm9[360p,128]_新・豪血寺一族 -煩悩解放 - レッツゴー！陰陽師\"'.hls/master.m3u8'.
hls to single: Reading option '-hide_banner' ... matched as option 'hide_banner' (do not show program banner) with argument '1'.
hls to single: Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
hls to single: Reading option '-c:v' ... matched as option 'c' (codec name) with argument 'copy'.
hls to single: Reading option '-c:a' ... matched as option 'c' (codec name) with argument 'copy'.
hls to single: Reading option '-id3v2_version' ... matched as AVOption 'id3v2_version' with argument '3'.
hls to single: Reading option '-metadata' ... matched as option 'metadata' (add metadata) with argument 'title=新・豪血寺一族 -煩悩解放 - レッツゴー！陰陽師\"''.
hls to single: Reading option '-metadata' ... matched as option 'metadata' (add metadata) with argument 'comment=sm9[360p,128].hls'.
hls to single: Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
hls to single: Reading option '/tmp/nlHls2Mp4_10828689105895585898.mp4' ... matched as output url.
hls to single: Finished splitting the commandline.
hls to single: Parsing a group of options: global .
hls to single: Applying option hide_banner (do not show program banner) with argument 1.
hls to single: Applying option loglevel (set logging level) with argument debug.
hls to single: Applying option y (overwrite output files) with argument 1.
hls to single: Successfully parsed a group of options.
hls to single: Parsing a group of options: input url ../cache/sm9[360p,128]_新・豪血寺一族 -煩悩解放 - レッツゴー！陰陽師\"'.hls/master.m3u8.
hls to single: Successfully parsed a group of options.
hls to single: Opening an input file: ../cache/sm9[360p,128]_新・豪血寺一族 -煩悩解放 - レッツゴー！陰陽師\"'.hls/master.m3u8.
hls to single: [NULL @ 0x5eee5842c4c0] Opening '../cache/sm9[360p,128]_新・豪血寺一族 -煩悩解放 - レッツゴー！陰陽師\"'.hls/master.m3u8' for reading
hls to single: ../cache/sm9[360p,128]_新・豪血寺一族 -煩悩解放 - レッツゴー！陰陽師\"'.hls/master.m3u8: No such file or directory

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例2:
hls to single: Splitting the commandline.
hls to single: Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
hls to single: Reading option '-hide_banner' ... matched as option 'hide_banner' (do not show program banner) with argument '1'.
hls to single: Reading option '-i' ... matched as input url with argument 'abc.mp4'.
hls to single: Reading option '-a' ...Unrecognized option 'a'.
hls to single: Error splitting the argument list: Option not found