HLS Segmenter with SCTE-35
Project description
Details | Install | Use | Customize | Live Events | Bugs | Feedback | Cue | Stream Diff | Sidecar SCTE35
x9k3
HLS Segmenter with SCTE-35 Baked In
- SCTE-35 Cues in Mpegts Streams are Translated into HLS tags.
- Segments are Split on SCTE-35 Cues as needed.
- M3U8 Manifests are created with SCTE-35 HLS tags.
- Supports h264 and h265 and mpeg2 video.
- Multi-protocol. Files, Http(s), Multicast, and Udp.
- Supports Live Streaming.
- Customizable Ad Break Criteria
- SCTE-35 Cues Can Now Load from a Sidecar File.
- Fake live Stream with Video Looping Demo.
ffplay https://slo.me/index.m3u8
Details
-
Segments are cut on iframes.
-
Segment size is 2 seconds or more, determined by GOP size.
-
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 are added when received.
-
All SCTE35 cue commands are added.
# Time Signal
#EXT-X-SCTE35:CUE="/DC+AAAAAAAAAP/wBQb+W+M4YgCoAiBDVUVJCW3YD3+fARFEcmF3aW5nRlJJMTE1V0FCQzUBAQIZQ1VFSQlONI9/nwEKVEtSUjE2MDY3QREBAQIxQ1VFSQlw1HB/nwEiUENSMV8xMjEwMjExNDU2V0FCQ0dFTkVSQUxIT1NQSVRBTBABAQI2Q1VFSQlw1HF/3wAAFJlwASJQQ1IxXzEyMTAyMTE0NTZXQUJDR0VORVJBTEhPU1BJVEFMIAEBhgjtJQ=="
#EXTINF:2.085422,
seg1.ts
SCTE-35 cues with a preroll are inserted again at the splice point
# Splice Point @ 17129.086244
#EXT-X-SCTE35:CUE="/DC+AAAAAAAAAP/wBQb+W+M4YgCoAiBDVUVJCW3YD3+fARFEcmF3aW5nRlJJMTE1V0FCQzUBAQIZQ1VFSQlONI9/nwEKVEtSUjE2MDY3QREBAQIxQ1VFSQlw1HB/nwEiUENSMV8xMjEwMjExNDU2V0FCQ0dFTkVSQUxIT1NQSVRBTBABAQI2Q1VFSQlw1HF/3wAAFJlwASJQQ1IxXzEyMTAyMTE0NTZXQUJDR0VORVJBTEhPU1BJVEFMIAEBhgjtJQ=="
#EXTINF:0.867544,
seg2.ts
CUE-OUT ans CUE-IN are added at the splice point
#EXT-X-SCTE35:CUE="/DAxAAAAAAAAAP/wFAUAAABdf+/+zHRtOn4Ae6DOAAAAAAAMAQpDVUVJsZ8xMjEqLYemJQ==" CUE-OUT=YES
#EXTINF:1.668334,
seg13.ts
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 settingX9K3.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" )
- Sliding Window for 5 WINDOW_SLOTS
- A cue out continue tag is added to first segment in manifest during an ad break.
--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.
Stream Diff
-
stream diff is the difference between the playback time of the stream and generation of segments by x9k3.
-
A segment with a 2 second duration that takes 0.5 seconds to generate would have a stream diff of 1.5.
-
In the default mode, stream_diff is a benchmark of playlist generation.
a@debian:~/x9k3$ time x9k3 -i local-vid.ts
./seg0.ts start: 3.545000 duration: 2.112000 stream diff: 2.094049
./seg1.ts start: 5.593000 duration: 2.048000 stream diff: 4.133058
...
./seg77.ts start: 163.011667 duration: 2.176000 stream diff: 161.307591
./seg78.ts start: 165.187667 duration: 2.176000 stream diff: 163.482903 <-- big stream diff
real 0m0.482s <-- fast segmenting for VOD
user 0m0.334s
sys 0m0.128s
-
stream_diff with
--live
or--delete
or--replay
- stream_diff automatically throttles non-live streams for realtime playback .
- stream_diff keeps segmentation and the sliding window in sync.
a@debian:~/x9k3$ time x9k3 -i local-vid.ts --live
./seg0.ts start: 1.433000 duration: 2.112000 stream diff: 1.749682
./seg1.ts start: 3.545000 duration: 2.048000 stream diff: 1.664505
./seg2.ts start: 5.593000 duration: 2.005333 stream diff: 1.604484
./seg3.ts start: 7.598333 duration: 2.026667 stream diff: 1.608694
...
./seg76.ts start: 158.617000 duration: 2.218667 stream diff: 0.151273
./seg77.ts start: 160.835667 duration: 2.176000 stream diff: 0.101823
./seg78.ts start: 163.011667 duration: 2.176000 stream diff: 0.100369 <-- small stream diff
real 2m44.775s <-- real time segmenting to sync live stream sliding window
user 0m0.678s
sys 0m0.169s
Requires
- python 3.6+ or pypy3
- threefive
- new_reader
Install
- Use pip to install the the x9k3 lib and executable script x9k3
# python3
python3 -mpip install x9k3
# pypy3
pypy3 -mpip install x9k3
How to Use
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
use ffmpeg to read multicast stream as input and x9k3 to segment
with a sliding window, and expiring old segments.
--delete implies --live
ffmpeg -re -copyts -i udp://@235.35.3.5:3535 -map 0 -c copy -f mpegts - | x9k3 --delete
https stream for input, and writing segments to an output directory
directory will be created if it does not exist.
x9k3 -i https://so.slo.me/longb.ts --output_dir /home/a/variant0
using stdin as input
cat video.ts | x9k3
load scte35 cues from a text file
Sidecar Cues will be handled the same as SCTE35 cues from a video stream.
line format for text file : 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
In Live Mode you can do dynamic cue injection
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
FAQ
Q.
How do I Customize CUE-OUT and CUE-IN ad break events?
A.
Override the X9K3.scte35.is_cue_out
and X9K3.scte35.is_cue_in
static methods.
The X9K3 class has three static methods you can override and customize.
@staticmethod | arg | return value | details |
---|---|---|---|
mk_cue_tag | cue | text | called to generate scte35 hls tags |
is_cue_out | cue | bool | returns True if the cue is a CUE-OUT |
is_cue_in | cue | bool | returns True if the cue is a CUE-IN |
Example
- Override the static method X9K3.scte35.is_cue_out(cue)
- Require
- a Splice Command of type
6
, Time Signal - a Splice Descriptor tag of type
2
, Segmentation Descriptor - a Segmentation Type Id of
0x22
, "Break Start"
- a Splice Command of type
def my_cue_out(cue):
"""
my_cue_out returns True
if the splice command is a time signal
"""
if cue.command.command_type == 6: # time signal
for d in cue.descriptors: # cue.descriptors is always list
if d.tag ==2: # Segmentation Descriptor tag
if d.segmentation_type_id == 0x22: # Break Start
return True
return False
- Create an X9K3 instance
from x9k3 import X9K3
x9 = X9K3("vid.ts")
- set is_cue_out to your custom function
x9.scte35.is_cue_out = my_cue_out
x9.decode()
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