python3 -mpip install umzz

• and / or

    pypy3 -mpip install umzz

Don't use a master.m3u8 over a network,

• Here's as close I can keep 4 renditions in sync over currently.
• If the master.m3u8 is local, the renditions stay in sync

If you use a master,m3u8 across a network,
it will have problems. You're trying to download
and parse all the renditions at the same time.
Instead use ffmpeg to pull one rendition off the network
and use it to create a new local master.m3u8.
This is the faster way to do it

• something like

ffmpeg  -re -copyts    
-i https://example.com/rendition4.m3u8  \ 
-g 30 -r 30 -flags +cgop \         
-c:v libx264 -preset faster \       
-b:v:0 2500k -b:v:1 256k  \          
-filter:v:0 scale=1920:1080 -filter:v:1 scale=512:288 \
-c:a aac -b:a 64k \                          
-map 0:v -map 0:a -map 0:v -map 0:a  \ 
-f hls -var_stream_map "v:0,a:0 v:1,a:1" \
-master_pl_name master.m3u8   \
fu3/mo_%v.m3u8  

• While ffmpeg is working, wait a few seconds and then startup umzz.

  umzz -i fu3/master.m3u8 -s my_sidecar.txt -l
  

• and you'll be good to go.

usage: umzz [-h] [-i INPUT] [-c] [-d] [-l] [-n] [-o OUTPUT_DIR] [-p] [-r]
            [-s SIDECAR_FILE] [-S] [-t TIME] [-T HLS_TAG] [-w WINDOW_SIZE]
            [-v]

optional arguments:
  -h, --help            show this help message and exit

  -i INPUT, --input INPUT
                        Input source, like /home/a/vid.ts or
                        udp://@235.35.3.5:3535 or https://futzu.com/xaa.ts or
                        https://example.com/not_a_master.m3u8 [default: stdin]

  -c, --continue_m3u8   Resume writing index.m3u8 [default:False]

  -d, --delete          delete segments (enables --live) [default:False]

  -l, --live            Flag for a live event (enables sliding window m3u8)
                        [default:False]

  -n, --no_discontinuity
                        Flag to disable adding #EXT-X-DISCONTINUITY tags at
                        splice points [default:False]

  -o OUTPUT_DIR, --output_dir OUTPUT_DIR
                        Directory for segments and index.m3u8 (created if
                        needed) [default:'.']

  -p, --program_date_time
                        Flag to add Program Date Time tags to index.m3u8 (
                        enables --live) [default:False]

  -r, --replay          Flag for replay aka looping (enables --live,--delete)
                        [default:False]

  -s SIDECAR_FILE, --sidecar_file SIDECAR_FILE
                        Sidecar file of SCTE-35 (pts,cue) pairs.[default:None]

  -S, --shulga          Flag to enable Shulga iframe detection mode
                        [default:False]

  -t TIME, --time TIME  Segment time in seconds [default:2]

  -T HLS_TAG, --hls_tag HLS_TAG
                        x_scte35, x_cue, x_daterange, or x_splicepoint
                        [default:x_cue]

  -w WINDOW_SIZE, --window_size WINDOW_SIZE
                        sliding window size (enables --live) [default:5]

  -v, --version         Show version

    from umzz import do, argue

    args =argue()

    args.input = "/home/a/slow/master.m3u8"
    args.live = True
    args.replay = True
    args.sidecar_file="sidecar.txt"
    args.output_dir = "out-stuff"

    do(args)

• set any command line options programmatically with args.
• the vars in args correspond to the long_names of the cli tool.
• the vars in args can be access via dot notation
• these are the defaults returned from argue() .