umzz 0.0.33

Ultra Mega Zoom Zoom is SCTE-35 Injection for Adaptive Bitrate HLS

Ultra Mega zoom zoom

Live Adaptive Bitrate HLS SCTE35 Cue Injection, powered by threefive.

Latest Version v0.0.33

---

• umzz
  • Handles live streams in realtime.
  • supports mpegts segments that use h264, h265, and mpeg2 video codecs.
  • Does not encode. Use any encoder you like and pass umzz the master.m3u8.
  • Adds the SCTE-35 Cues to each variant, and adjusts segments to start on iframes.
  • Keeps variants in sync so adaptive bitrate HLS works properly.
  • Outputs a new master.m3u8, new variant m3u8s, and variant segments with SCTE-35.

umzz parsing 4 live renditions (over a network) and ffplay playing all four umzz streams

Install

    python3 -mpip install umzz

• and / or

    pypy3 -mpip install umzz

Inputs

umzz takes a master.m3u8 as input, More on inputs.

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.

Command Line

cli tool

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

Writing Code

using umzz programmatically

    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() .

vars in args	default value
input	sys.stdin.buffer
continue_m3u8	False
delete	False
live	False
no_discontinuity	False
output_dir	'.'
program_date_time	False
replay	False
sidecar_file	None
shulga	False
time	2
hls_tags	'x_cue'
window_size	5

SCTE-35

SCTE-35 cues are load from a sidecar file. More on sidecar files.

Sidecar Cues will be handled the same as SCTE35 cues from a video stream.
line format for text file insert_pts, cue

pts is the insert time for the cue, A four second preroll is standard. cue can be base64,hex, int, or bytes

      a@debian:~/umzz$ cat sidecar.txt
  
      38103.868589, /DAxAAAAAAAAAP/wFAUAAABdf+/+zHRtOn4Ae6DOAAAAAAAMAQpDVUVJsZ8xMjEqLYemJQ== 
      38199.918911, /DAsAAAAAAAAAP/wDwUAAABef0/+zPACTQAAAAAADAEKQ1VFSbGfMTIxIxGolm0= 

 

  umzz -i  noscte35-master.m3u8  -s sidecar.txt

Quick Example

• if you have a master.m3u8 like

a@debian:~/umzz$ cat ~/stuff/master.m3u8
#EXTM3U
#EXT-X-VERSION:6
#EXT-X-STREAM-INF:BANDWIDTH=83222,RESOLUTION=864x486,CODECS="avc1.42c01f,mp4a.40.2"
stream_0.m3u8

#EXT-X-STREAM-INF:BANDWIDTH=83222,RESOLUTION=1280x720,CODECS="avc1.42c01f,mp4a.40.2"
stream_1.m3u8

#EXT-X-STREAM-INF:BANDWIDTH=83222,RESOLUTION=640x360,CODECS="avc1.42c01e,mp4a.40.2"
stream_2.m3u8

• and you want to add a splice insert at PTS 13140.123456, create a sidecar file and add the following line.

a@debian:~/umzz$ cat sidecar.txt
13140.123456,/DAhAAAAAAAAAP/wEAUAAAAJf78A/gASZvAACQAAAACokv3z

• then run this.

a@debian:~/umzz$ umzz -i ~/stuff/master.m3u8 -s sidecar.txt -o fu

• in the base dir fu is the new HLS with SCTE-35

a@debian:~/umzz$ ls -ald fu/* fu/*/index.m3u8
drwxr-xr-x 1 a a 1816 Apr  9 06:07 fu/0
-rw-r--r-- 1 a a 3171 Apr  9 06:07 fu/0/index.m3u8
drwxr-xr-x 1 a a 1816 Apr  9 06:07 fu/1
-rw-r--r-- 1 a a 3171 Apr  9 06:07 fu/1/index.m3u8
drwxr-xr-x 1 a a 1816 Apr  9 06:07 fu/2
-rw-r--r-- 1 a a 3171 Apr  9 06:07 fu/2/index.m3u8
-rw-r--r-- 1 a a  320 Apr  9 06:07 fu/master.m3u8