x9k3 1.0.29

ABR HLS Segmenter with SCTE-35 Injecton

x9k3

x9k3 Injects SCTE-35 Into HLS

---

Current Version: v1.0.29

• SuperTimer is now active in x9k3.

Heads up!

I found a bug in every version before v1.0.29 that differs SCTE-35 from the sidecar file to the next segment, unless it occurs in the first half of the segment. Upgrade to v1.0.27 to fix

Features

• All SCTE-35 HLS Tags are Supported.
• Add SCTE-35 Tags to ABR HLS
• Segment MPEGTS streams into HLS and transfer SCTE-35 or add new SCTE-35 Tags
• SCTE-35 Cues in Mpegts Streams are Translated into HLS tags.
• SCTE-35 Cues can be added from a Sidecar File.
• Segments are Split on SCTE-35 Cues as needed.
• Segments Start on iframes.
• Supports h264 and h265 .
• Multi-protocol. Input sources may be Files, Http(s), Multicast, SRT, or Unicast UDP streams.
• Supports Live Streaming.

---

News

• SRT support for input videos is now working.

• SCTE-35 part 2 support for Event Descriptors and Property objects.
  Adrian

• throttling is now handled by a nanosecond accurate timer, SuperTimer. It keeps ABR HLS renditions in sync with each other. It's pretty cool.

  • SuperTimer will be in the next release.

• [ screen shot of a terminal ]

---

Documentation

• Install
• Use
  • Cli
    • Switches ( --this and --that)
    • Usage Examples
  • Lib (how to use x9k3 as a library)
    • ABR in Code
  • Sidecar Files (these are how you add the SCTE-35, super important)
    • Adding SCTE-35 in real time
    • SCTE-35 Splice Immediate (not the same as real time)
    • SCTE-35 Generation with adbreak3
  • Playlists (make a playlist of MPEGTS or M3u8 files and feed it to x9k3 as input)
• HLS Stuff
  • HLS as Input
  • ABR HLS (there are some terms and conditions)
    • ABR in Code (in less than ten lines)
  • Byterange HLS
  • Live HLS (sliding windows, deleting segments, all that jazz)
  • Looping videos (play the same thing over and over)
• Cues
  • CUE-OUT
  • CUE-IN
• SCTE-35 Tags
  • #EXT-X-CUE
  • #EXT-X-SCTE35
  • #EXT-X-DATERANGE
  • #EXT-X-SPLICEPOINT

Install

• Use pip to install the x9k3 lib and the executable scripts x9k3, adbreak3, and adinterval3.

# python3

python3 -mpip install x9k3

# pypy3 

pypy3 -mpip install x9k3

• Both OpenBSD and Debian now require '--break-system-packages' to be appended to the pip install command if you are not using a venv.

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Details

• X-SCTE35, X-CUE, X-DATERANGE, or X-SPLICEPOINT HLS tags can be generated. set with the --hls_tag switch.

• reading from stdin now available

• Segments are cut on iframes.

• Segment time is 2 seconds or more, determined by GOP size. Can be set with the -t switch or by setting X9K3.args.time

• Segments are named seg1.ts seg2.ts etc...

• For SCTE-35, Video segments are cut at the the first iframe >= the splice point pts.

• If no pts time is present in the SCTE-35 cue, the segment is cut at the next iframe.

• SCTE-35 cues with a preroll are inserted at the splice point.

• x9k3 can continue an existing m3u8 file. You can switch or resume streams, x9k3 handles the details.

How to Use

cli

do the simplest thing that can possibly work

• There are a lot of command line switches available, but you do not have to use them all.
  

Try it like this first

x9k3 -i video.ts -o output_dir

later you can add as many switches as you like.

Super Important tip, -t TIME, --time TIME Segment time in seconds [default:2] can be a float. If you are adding SCTE-35 to existing HLS and want to retain the segments as much as possible, if the segment times are mostly 1.92, put -t 1.92 .

Switches

a@fu:~/x9k3$ x9k3 --help

usage: x9k3 [-h] [-i INPUT] [-b] [-c] [-d] [-l] [-n]
            [-no_adrian_is_cool_tags_at_splice_points_because_I_suck] [-N]
            [-o OUTPUT_DIR] [-e] [-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
                        The Input video can be mpegts or m3u8 with mpegts
                        segments, or a playlist with mpegts files and/or
                        mpegts m3u8 files. The input can be a local video,
                        http(s), udp, multicast or stdin.

  -b, --byterange       Flag for byterange hls [default:False]

  -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]

  -no_adrian_is_cool_tags_at_splice_points_because_I_suck
                        Flag to disable adding #EXT-X-ADRIAN-IS-COOL tags at
                        splice points [default:False]

  -N, --no-throttle,             
                        Flag to disable live throttling [default:False]

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

  -e, --exclude_mpegts  Flag to exclude parsing SCTE-35 from MPEGTS.
                        [default:False]

  -p, --program_date_time
                        Flag to add Program Date Time tags to index.m3u8  [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

Example Usage

local file as input

   x9k3 -i video.mpegts

multicast stream as input with a live sliding window

x9k3 --live -i udp://@235.35.3.5:3535 -o output_dir

Live mode works with a live source or static files.

• x9k3 will throttle segment creation to mimic a live stream.

x9k3 --live -i /some/video.ts -o output_dir

live sliding window and deleting expired segments

x9k3  -i udp://@235.35.3.5:3535 --delete -o output_dir

https stream for input, and writing segments to an output directory

• directory will be created if it does not exist.

  x9k3 -i https://iodisco.com/neworder.ts --output_dir /home/a/variant0

https hls m3u8 for input, and inserting SCTE-35 from a sidecar file, and continuing from a previously create index.m3u8 in the output dir

  x9k3 -i https://bigcorp.ltd/longb2.m3u8 --output_dir /home/a/variant0 -continue_m3u8 -s sidecar.txt

using stdin as input

cat video.ts | x9k3   -o output_dir

live m3u8 file as input, add SCTE-35 from a sidecar file, change segment duration to 3 and output as live stream

x9k3 -i https://example.com/rendition.m3u8 -s sidecar.txt -t 3 -l -o output-dir

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Programmatically

Up and Running in three Lines

        from x9k3 import X9K3            # 1
        x9 = X9K3('/home/a/cool.ts')     # 2
        x9.decode()                      # 3

Writing Code with x9k3

• you can get a complete set of args and the defaults like this

from x9k3 import X9K3
x9 = X9K3()

>>>> {print(k,':',v) for k,v in vars(x9.args).items()}

input : <_io.BufferedReader name='<stdin>'>
continue_m3u8 : False
delete : False
live : False
no_discontinuity : False
no_throttle : False
output_dir : .
program_date_time : False
replay : False
sidecar_file : None
shulga : False
time : 2
hls_tag : x_cue
window_size : 5
version : False

• or just

>>>> print(x9.args)

Namespace(input=<_io.BufferedReader name='<stdin>'>, continue_m3u8=False, delete=False, live=False, no_discontinuity=False, no_throttle=False, output_dir='.', program_date_time=False, replay=False, sidecar_file=None, shulga=False, time=2, hls_tag='x_cue', window_size=5, version=False)

• Setting parameters

from x9k3 import X9K3
x9 = X9K3()

• input source

x9.args.input = "https://futzu.com/xaa.ts"   

• hls_tag can be x_scte35, x_cue, x_daterange, or x_splicepoint

x9.args.hls tag = x_cue 

• output directory default is "."

x9.args.output_dir="/home/a/stuff"

• live

x9.args.live = True

• replay (loop video) ( also sets live )

x9.args.replay = True

• delete segments when they expire ( also sets live )

x9.args.delete = True

• add program date time tags ( also sets live )

x9.args.program_date_time= True

• set window size for live mode ( requires live )

x9.args.window_size = 5 

• run

x9.decode()

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HLS as input

• x9k3 can use HLS manifests as input.
• HLS Must be MPEGTS with audio and video together in the segment.
• No audio only or separate audio.
• Existing HLS SCTE-35 Tags in input manifests will be dropped.
• ABR HLS has additional restrictions

Byterange

• with the cli tool1.92
  • use full path to video file when creating byterange m3u8.

x9k3 -i /home/a/input.ts -b

• programmatically

from x9k3 import X9K3
x9 = X9K3()
x9.self.args.byterange = True
x9.decode()

• output

#EXTM3U
#EXT-X-VERSION:4
#EXT-X-TARGETDURATION:3
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-DISCONTINUITY-SEQUENCE:0
#EXT-X-X9K3-VERSION:0.2.55
#EXTINF:2.000000,
#EXT-X-BYTERANGE:135548@0
msnbc1000.ts
#EXTINF:2.000000,
#EXT-X-BYTERANGE:137992@135548
msnbc1000.ts
#EXTINF:2.000000,
#EXT-X-BYTERANGE:134796@273540
msnbc1000.ts
#EXTINF:2.000000,
#EXT-X-BYTERANGE:140436@408336
msnbc1000.ts
#EXTINF:2.000000,
#EXT-X-BYTERANGE:130096@548772
msnbc1000.ts
<SNIP>

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ABR HLS

if you are passing a master.m3u8 file to x9k3, it's best if it's on the same server, especially if you have a lot of Renditions. x9k3 works just fine over a network, make sure you have the bandwidth. For x9k3 to add SCTE-35 to ABR HLS, it has to parse all of the renditions, at the same time. To handle this efficiently, x9k3 starts a separate process for each rendition, which means x9k3 will scale very well.

Here's how it works.

• When x9k3 detects a master.m3u8 as input, it starts up an ABR instance.
• The ABR instance parses the master.m3u8 and finds rendtitions.
• For each rendition an x9k3 process is started.
• The ABR process also parses the SCTE-35 sidecar file and writes a sidecar file for each rendition.
• The master.m3u8 is written to the output_dir.
• Rendition segments and manifest files are written to output_dir/0, output_dir/1, etc.
• any args passed in are set for all rendtions.

The terms and condtions.

• HLS version 3 support only
• Use a Sidecar file for SCTE-35
• Only MPEGTS segments
• Audio and Video MUST be in the same stream.
• No separate Audio tracks
• No Audio only
• No WebVTT
• Pass a local master.m3u8 as input for x9k3

x9k3 -i ~/o21/master.m3u8 -t 3 -l -s sidecar.txt

• ABR works well over a network, if you have the bandwidth to download all renditions simultaneously.
  • If you don't have the bandwidth, the renditions will get out of sync.
  • The throttle time is a good indicator. throttle must be greater than half of target duration for all renditions.
  • throttle time is shown in the x9k3 output

./0/seg0.ts:   start: 0.160   end: 10.000   duration: 9.840  # <-- duration   
throttling 8.22                        # <--- throttle time        throttle time > (duration / 2) GOOD


./2/seg0.ts:   start: 0.160   end: 10.000   duration: 9.840  # <-- duration  
throttling 4.23                       # <--- throttle time          throttle time < (duration / 2)  BAD

ABR in Code

Python 3.9.16 (7.3.11+dfsg-2+deb12u3, Dec 30 2024, 22:36:23)
[PyPy 7.3.11 with GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>> from x9k3 import argue
>>>> from x9k3.x9mp import do
>>>> url = 'https://demo.unified-streaming.com/k8s/live/scte35.isml/.m3u8'
>>>> args = argue()
>>>> args.input=url
>>>> do(args)

• imports

from x9k3 import argue
from x9k3.x9mp import do

• define source

 url = 'https://demo.unified-streaming.com/k8s/live/scte35.isml/.m3u8'

• generate the args.
• more about args

args = argue()

• args is the Namespace returned by the standard library's argparser.
• These are same options as the cli x9k3.

args
Namespace(input=<_io.BufferedReader name='<stdin>'>, byterange=False, continue_m3u8=False,
  delete=False, live=False, no_discontinuity=False, no_adrian_is_cool_tags_at_splice_points_because_I_suck=False,
  no_throttle=False, output_dir='.', exclude_mpegts=False,program_date_time=False, replay=False, sidecar_file=None,
  shulga=False, time=2, hls_tag='x_cue', window_size=5, version=False)

• use dot notation to set what you need

args.input=url

• call do(args)

from x9k3.x9mp import do

• That's it.

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Playlists

• playlists can be used as input

• playlist files must end in .playlist

• lines are video or video, sidecar

  • if video,sidecar, the sidecar file only applies to that video

• playlists can have mpegts video, mpegts m3u8, and playlists.

• example playlist

f10.ts,f10sidecar.txt # comments can be here
f17.ts
f60.ts
flat-striped.ts
# Comments can go here too.
flat.ts
input.ts
nmax.ts
nmx.ts,nmx-sidecar.txt
https://futzu.com/xaa.ts
https://example.com/index.m3u8,another-sidecar.txt

• using

 x9k3 -i out.playlist

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Sidecar Files

load scte35 cues from a Sidecar file

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:~/x9k3$ cat sidecar.txt

38103.868589, /DAxAAAAAAAAAP/wFAUAAABdf+/+zHRtOn4Ae6DOAAAAAAAMAQpDVUVJsZ8xMjEqLYemJQ== 
38199.918911, /DAsAAAAAAAAAP/wDwUAAABef0/+zPACTQAAAAAADAEKQ1VFSbGfMTIxIxGolm0= 

    

x9k3 -i  noscte35.ts  -s sidecar.txt 

adbreak3 writes to sidecar files for you.

In Live Mode you can do dynamic cue injection with a Sidecar file

touch sidecar.txt

x9k3 -i vid.ts -s sidecar.txt -l 

# Open another terminal and printf cues into sidecar.txt

printf '38103.868589, /DAxAAAAAAAAAP/wFAUAAABdf+/+zHRtOn4Ae6DOAAAAAAAMAQpDVUVJsZ8xMjEqLYemJQ==\n' > sidecar.txt

adbreak3 also does dynamic injection.

Sidecar files can now accept 0 as the PTS insert time for Splice Immediate.

Specify 0 as the insert time, the cue will be insert at the start of the next segment. Using 0 only works in live mode

printf '0,/DAhAAAAAAAAAP/wEAUAAAAJf78A/gASZvAACQAAAACokv3z\n' > sidecar.txt

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A CUE-OUT can be terminated early using a sidecar file.

In the middle of a CUE-OUT send a splice insert with the out_of_network_indicator flag not set and the splice immediate flag set. Do the steps above , and then do this

printf '0,/DAcAAAAAAAAAP/wCwUAAAABfx8AAAEAAAAA3r8DiQ==\n' > sidecar.txt

It will cause the CUE-OUT to end at the next segment start.

#EXT-X-CUE-OUT 13.4
./seg5.ts:	start:112.966667	end:114.966667	duration:2.233334
#EXT-X-CUE-OUT-CONT 2.233334/13.4
./seg6.ts:	start:114.966667	end:116.966667	duration:2.1
#EXT-X-CUE-OUT-CONT 4.333334/13.4
./seg7.ts:	start:116.966667	end:118.966667	duration:2.0
#EXT-X-CUE-OUT-CONT 6.333334/13.4
./seg8.ts:	start:117.0	        end:119.0	duration:0.033333
#EXT-X-CUE-IN None
./seg9.ts:	start:119.3	        end:121.3	duration:2.3

Using 0 only works in live mode ⇪ top

---

Cues

CUE-OUT

A CUE-OUT is defined as:

• A Splice Insert Command with:

  • the out_of_network_indicator set to True
  • a break_duration.

• A Time Signal Command and a Segmentation Descriptor with:

  • a segmentation_duration
  • a segmentation_type_id of:
    • 0x22: "Break Start",
    • 0x30: "Provider Advertisement Start",
    • 0x32: "Distributor Advertisement Start",
    • 0x34: "Provider Placement Opportunity Start",
    • 0x36: "Distributor Placement Opportunity Start",
    • 0x44: "Provider Ad Block Start",
    • 0x46: "Distributor Ad Block Start",

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CUE-IN

A CUE-IN is defined as:

• A Splice Insert Command

  • with the out_of_network_indicator set to False

• A Time Signal Command and a Segmentation Descriptor with:

  • a segmentation_type_id of:

    • 0x23: "Break End",
    • 0x31: "Provider Advertisement End",
    • 0x33: "Distributor Advertisement End",
    • 0x35: "Provider Placement Opportunity End",
    • 0x37: "Distributor Placement Opportunity End",
    • 0x45: "Provider Ad Block End",
    • 0x47: "Distributor Ad Block End",

• For CUE-OUT and CUE-IN, only the first Segmentation Descriptor will be used

---

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Supported HLS Tags

• #EXT-X-CUE
• #EXT-X-DATERANGE
• #EXT-X-SCTE35
• #EXT-X-SPLICEPOINT

x_cue

• CUE-OUT

#EXT-X-DISCONTINUITY
#EXT-X-CUE-OUT:242.0
#EXTINF:4.796145,
seg32.ts

• CUE-OUT-CONT

#EXT-X-CUE-OUT-CONT:4.796145/242.0
#EXTINF:2.12,

• CUE-IN

#EXT-X-DISCONTINUITY
#EXT-X-CUE-IN
#EXTINF:5.020145,
seg145.ts

x_scte35

• CUE-OUT

#EXT-X-DISCONTINUITY
#EXT-X-SCTE35:CUE="/DAvAAAAAAAAAP/wFAUAAAKWf+//4WoauH4BTFYgAAEAAAAKAAhDVUVJAAAAAOv1oqc=" ,CUE-OUT=YES 
#EXTINF:4.796145,
seg32.ts

• CUE-OUT-CONT

#EXT-X-SCTE35:CUE="/DAvAAAAAAAAAP/wFAUAAAKWf+//4WoauH4BTFYgAAEAAAAKAAhDVUVJAAAAAOv1oqc=" ,CUE-OUT=CONT
#EXTINF:2.12,
seg33.ts

• CUE-IN

#EXT-X-DISCONTINUITY
#EXT-X-SCTE35:CUE="/DAqAAAAAAAAAP/wDwUAAAKWf0//4rZw2AABAAAACgAIQ1VFSQAAAAAtegE5" ,CUE-IN=YES 
#EXTINF:5.020145,
seg145.ts

x_daterange

• CUE-OUT

#EXT-X-DISCONTINUITY
#EXT-X-DATERANGE:ID="1",START-DATE="2022-10-14T17:36:58.321731Z",PLANNED-DURATION=242.0,SCTE35-OUT=0xfc302f00000000000000fff01405000002967fefffe16a1ab87e014c562000010000000a00084355454900000000ebf5a2a7
#EXTINF:4.796145,
seg32.ts

• CUE-IN

#EXT-X-DISCONTINUITY
#EXT-X-DATERANGE:ID="2",END-DATE="2022-10-14T17:36:58.666073Z",SCTE35-IN=0xfc302a00000000000000fff00f05000002967f4fffe2b670d800010000000a000
843554549000000002d7a0139
#EXTINF:5.020145,
seg145.ts

x_splicepoint

• CUE-OUT

#EXT-X-DISCONTINUITY
#EXT-X-SPLICEPOINT-SCTE35:/DAvAAAAAAAAAP/wFAUAAAKWf+//4WoauH4BTFYgAAEAAAAKAAhDVUVJAAAAAOv1oqc=
#EXTINF:4.796145,
seg32.ts

• CUE-IN

#EXT-X-DISCONTINUITY
#EXT-X-SPLICEPOINT-SCTE35:/DAqAAAAAAAAAP/wDwUAAAKWf0//4rZw2AABAAAACgAIQ1VFSQAAAAAtegE5
#EXTINF:5.020145,
seg145.ts

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VOD

• x9k3 defaults to VOD style playlist generation.
• All segment are listed in the m3u8 file.

Live

• Activated by the --live, --delete, or --replay switch or by setting X9K3.live=True

--live

• Like VOD except:
  • M3u8 manifests are regenerated every time a segment is written
  • Segment creation is throttled when using non-live sources to simulate live streaming. ( like ffmpeg's "-re" )
  • default Sliding Window size is 5, it can be changed with the -w switch or by setting X9k3.window.size

--delete

• implies --live
• deletes segments when they move out of the sliding window of the m3u8.

--replay

• implies --live
• implies --delete
• loops a video file and throttles segment creation to fake a live stream.

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adbreak3

• included with x9k3
• adbreak3 is a cli tool to generate SCTE-35 for sidecar files.
• by default adbreak3 generates 2 SCTE35 Cues with Splice Inserts for CUE-OUT and CUE-IN and writes it to a sidecar file.

a@fu:~$ adbreak3 -h
usage: adbreak3 [-h] [-d DURATION] [-e EVENT_ID] [-i] [-o] [-p PTS] [-P] [-s SIDECAR] [-v]

optional arguments:
  -h, --help            show this help message and exit
  -d DURATION, --duration DURATION
                        Set duration of ad break. [ default: 60.0 ]
  -e EVENT_ID, --event-id EVENT_ID
                        Set event id for ad break. [ default: 1 ]
  -i, --cue-in-only     Only make a cue-in SCTE-35 cue [ default: False ]
  -o, --cue-out-only    Only make a cue-out SCTE-35 cue [ default: False ]
  -p PTS, --pts PTS     Set start pts for ad break. Not setting pts will generate a Splice Immediate CUE-OUT. [default: 0.0 ]
  -P, --preroll         Add SCTE data four seconds before splice point. Used with MPEGTS. [ default: False ]
  -s SIDECAR, --sidecar SIDECAR
                        Sidecar file of SCTE-35 (pts,cue) pairs. [ default: sidecar.txt ]
  -v, --version         Show version

• Usage:

a@fu:~$ adbreak3 --pts 1234.567890 --duration 30 --sidecar sidecar.txt

Writing to sidecar file: sidecar.txt

		CUE-OUT   PTS:1234.567889   Id:1   Duration: 30.0
		CUE-IN    PTS:1264.567889   Id:2

• Sidecar file has SCTE-35 Cues for CUE-OUT and CUE-IN

a@fu:~$ cat sidecar.txt 
1234.56789,/DAlAAAAAAAAAP/wFAUAAABNf+/+Bp9rxv4AKTLgAE0AAAAAFz4v5A==
1264.56789,/DAgAAAAAAAAAP/wDwUAAABOf0/+BsiepgBOAAAAABSgtGA=

• Pass to x9k3

x9k3 -i input.ts -s sidecar.txt

Super Cool Feature: adbreak3 can be used in real time to add SCTE-35 on the fly to live HLS manifest.