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Собирал из чанков .m4s, полученных по ссылке
https://какой-то-сайт/720p.av1.mp4.m3u8
затем склеил чанки в один файл
00 00 0E E8 6D 6F 6F 66 00 00 00 10 6D 66 68 64
00 00 00 00 00 00 00 02 00 00 07 98 74 72 61 66
00 00 00 10 74 66 68 64 00 02 00 00 00 00 00 01
00 00 00 14 74 66 64 74 01 00 00 00 00 00 00 00
00 0A FC 80 00 00 00 84 74 72 75 6E 01 00 0F 01
00 00 00 07 00 00 1E 63 00 00 0E 10 00 00 47 BA
02 00 00 00 00 00 00 00 00 00 0E 10 00 01 7C DA
01 01 00 00 00 00 00 00 00 00 0E 10 00 00 00 03
01 01 00 00 00 00 00 00 00 00 0E 10 00 00 00 36
01 01 00 00 00 00 00 00 00 00 0E 10 00 00 00 03
01 01 00 00 00 00 00 00 00 00 0E 10 00 00 28 5C
01 01 00 00 00 00 00 00 00 00 0E 10 00 00 00 03
01 01 00 00 00 00 00 00 00 00 00 84 74 72 75 6E
01 00 0F 01 00 00 00 07 00 02 1C C5 00 00 0E 10
00 00 00 2C 01 01 00 00 00 00 00 00 00 00 0E 10
00 00 00 03 01 01 00 00 00 00 00 00 00 00 0E 10
00 00 4A 5D 01 01 00 00 00 00 00 00 00 00 0E 10
00 00 00 03 01 01 00 00 00 00 00 00 00 00 0E 10
00 00 0C 21 01 01 00 00 00 00 00 00 00 00 0E 10
00 00 00 03 01 01 00 00 00 00 00 00 00 00 0E 10
00 00 0D 30 01 01 00 00 00 00 00 00 00 00 00 84
74 72 75 6E 01 00 0F 01 00 00 00 07 00 02 91 ED
00 00 0E 10 00 00 00 03 01 01 00 00 00 00 00 00
00 00 0E 10 00 00 0C A9 01 01 00 00 00 00 00 00
00 00 0E 10 00 00 00 03 01 01 00 00 00 00 00 00
00 00 0E 10 00 00 56 AC 01 01 00 00 00 00 00 00
00 00 0E 10 00 00 00 03 01 01 00 00 00 00 00 00
00 00 0E 10 00 00 08 46 01 01 00 00 00 00 00 00
00 00 0E 10 00 00 00 03 01 01 00 00 00 00 00 00
00 00 00 84 74 72 75 6E 01 00 0F 01 00 00 00 07
00 03 10 56 00 00 0E 10 00 00 2B 1C 01 01 00 00
00 00 00 00 00 00 0E 10 00 00 00 03 01 01 00 00
00 00 00 00 00 00 0E 10 00 00 00 63 01 01 00 00
00 00 00 00 00 00 0E 10 00 00 00 03 01 01 00 00
00 00 00 00 00 00 0E 10 00 00 92 BA 01 01 00 00
00 00 00 00 00 00 0E 10 00 00 00 03 01 01 00 00
00 00 00 00 00 00 0E 10 00 00 00 7B 01 01 00 00
00 00 00 00 00 00 00 84 74 72 75 6E 01 00 0F 01
00 00 00 07 00 03 E0 5A 00 00 0E 10 00 00 00 03
01 01 00 00 00 00 00 00 00 00 0E 10 00 00 4B B8
01 01 00 00 00 00 00 00 00 00 0E 10 00 00 00 03
01 01 00 00 00 00 00 00 00 00 0E 10 00 00 17 AF
01 01 00 00 00 00 00 00 00 00 0E 10 00 00 00 03
01 01 00 00 00 00 00 00 00 00 0E 10 00 01 77 08
01 01 00 00 00 00 00 00 00 00 0E 10 00 00 00 03
01 01 00 00 00 00 00 00 00 00 00 84 74 72 75 6E
01 00 0F 01 00 00 00 07 00 05 CC 1D 00 00 0E 10
00 00 1D 66 01 01 00 00 00 00 00 00 00 00 0E 10
00 00 00 03 01 01 00 00 00 00 00 00 00 00 0E 10
00 00 21 62 01 01 00 00 00 00 00 00 00 00 0E 10
00 00 00 03 01 01 00 00 00 00 00 00 00 00 0E 10
00 00 14 43 01 01 00 00 00 00 00 00 00 00 0E 10
00 00 00 03 01 01 00 00 00 00 00 00 00 00 0E 10
00 00 3A 41 01 01 00 00 00 00 00 00 00 00 00 84
74 72 75 6E 01 00 0F 01 00 00 00 07 00 06 6A 9F
00 00 0E 10 00 00 00 03 01 01 00 00 00 00 00 00
00 00 0E 10 00 00 00 5F 01 01 00 00 00 00 00 00