{"id":672,"date":"2026-07-13T01:05:44","date_gmt":"2026-07-13T01:05:44","guid":{"rendered":"https:\/\/streamingvps.com\/blog\/scte-35-ad-insertion-live-tv-streaming-vps\/"},"modified":"2026-07-13T01:06:24","modified_gmt":"2026-07-13T01:06:24","slug":"scte-35-ad-insertion-live-tv-streaming-vps","status":"publish","type":"post","link":"https:\/\/streamingvps.com\/blog\/scte-35-ad-insertion-live-tv-streaming-vps\/","title":{"rendered":"What Is SCTE-35 and How Does Ad Insertion Work in Live TV Streaming?"},"content":{"rendered":"\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"TechArticle\",\n      \"headline\": \"What Is SCTE-35 and How Does Ad Insertion Work in Live TV Streaming?\",\n      \"description\": \"Learn how SCTE-35 ad cue points trigger live TV ad breaks, how they differ from SCTE-104, and how to insert markers on a VPS. Start monetizing it today.\",\n      \"datePublished\": \"2026-07-13\",\n      \"dateModified\": \"2026-07-13\",\n      \"author\": { \"@type\": \"Organization\", \"name\": \"StreamingVPS.com\" },\n      \"publisher\": { \"@type\": \"Organization\", \"name\": \"StreamingVPS.com\", \"logo\": { \"@type\": \"ImageObject\", \"url\": \"https:\/\/streamingvps.com\/logo.png\" } }\n    },\n    {\n      \"@type\": \"FAQPage\",\n      \"mainEntity\": [\n        { \"@type\": \"Question\", \"name\": \"Do I need special hardware to insert SCTE-35 markers on a VPS?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"No. If your source feed already carries SCTE-104 cues from a broadcast playout system or satellite receiver, a software encoder or streaming engine like Wowza or Flussonic running on a standard VPS can translate and pass through SCTE-35 markers without any dedicated ad-insertion hardware.\" } },\n        { \"@type\": \"Question\", \"name\": \"What is the difference between SCTE-35 and SCTE-104?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"SCTE-104 is the cue message format used inside the broadcast facility, typically carried over SDI ancillary data from a playout server or automation system. SCTE-35 is the equivalent signaling format carried inside the compressed MPEG transport stream itself; encoders translate SCTE-104 into SCTE-35 splice_info_section messages at the point of encoding.\" } },\n        { \"@type\": \"Question\", \"name\": \"Does SCTE-35 work with HLS and DASH, or only MPEG-TS?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"SCTE-35 originates in MPEG-TS but is commonly translated into EXT-X-CUE-OUT and EXT-X-CUE-IN tags (or EXT-X-DATERANGE) for HLS, and into EventStream elements for MPEG-DASH, so the same ad break signal can drive ad insertion across both delivery formats.\" } },\n        { \"@type\": \"Question\", \"name\": \"Can SCTE-35 break my live stream if it's misconfigured?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Yes. A malformed splice_info_section or a cue point with no matching return cue can cause player stalls, black frames, or an ad break that never ends, which is why cue points should be validated against the ANSI\/SCTE-35 spec before going live on a production channel.\" } },\n        { \"@type\": \"Question\", \"name\": \"Is server-side ad insertion (SSAI) required to use SCTE-35?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"No. SCTE-35 is just the signaling layer that marks where an ad break starts and ends. You can use it with SSAI, where the server splices in ad creative, or with client-side ad insertion, where the player itself requests and stitches the ad after seeing the cue.\" } }\n      ]\n    }\n  ]\n}\n<\/script>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>SCTE-35 is a digital cue-tone standard that inserts machine-readable &#8220;splice&#8221; messages into a live video stream to mark exactly where an ad break should start and stop.<\/strong> A playout system or encoder embeds these cue points directly into the MPEG transport stream (or translates them into HLS\/DASH manifest tags), and downstream ad-insertion systems read that signal to splice in commercials without a human ever touching a fader. If you&#8217;re running a FAST channel, IPTV lineup, or any monetized 24\/7 stream from a VPS, SCTE-35 is the mechanism that makes automated, per-viewer ad breaks possible at all.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Key Takeaways<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SCTE-35 markers are embedded splice_info_section messages inside an MPEG transport stream that tell downstream systems exactly when an ad break begins and ends.<\/li>\n<li>SCTE-104 is the broadcast-facility version of the same signal (usually carried over SDI); encoders convert SCTE-104 into SCTE-35 at the point of transport-stream encoding.<\/li>\n<li>For HLS delivery, SCTE-35 cues are typically translated into EXT-X-CUE-OUT \/ EXT-X-CUE-IN tags (or EXT-X-DATERANGE), and for DASH into EventStream elements in the MPD.<\/li>\n<li>Both Wowza Streaming Engine and Flussonic Media Server can pass through or generate SCTE-35 markers on a standard VPS \u2014 no dedicated broadcast ad-insertion appliance is required for small-to-mid-size FAST or IPTV channels.<\/li>\n<li>Malformed or unpaired cue points are the most common cause of stuck ad breaks and player stalls, so validating splice_info_section structure before a channel goes live matters more than picking a specific vendor.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What Is SCTE-35, Exactly?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SCTE-35 (formally ANSI\/SCTE 35, &#8220;Digital Program Insertion Cueing Message for Cable&#8221;) is a standard maintained by the Society of Cable Telecommunications Engineers that defines a binary message format called <code>splice_info_section<\/code>. That message rides inside an MPEG-2 transport stream on its own PID and carries fields like <code>splice_event_id<\/code>, <code>splice_immediate_flag<\/code>, <code>break_duration<\/code>, and <code>avail_num<\/code> \u2014 essentially a structured way of saying &#8220;an ad avail starts here, and it&#8217;s expected to last this many seconds.&#8221;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The standard itself doesn&#8217;t touch the video or audio essence at all. It&#8217;s pure signaling. What happens after the cue point is read \u2014 whether an ad actually gets stitched in, skipped, or ignored \u2014 is entirely up to whatever system is listening downstream: a cable headend, an SSAI server, or a compliant HLS\/DASH player.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You&#8217;ll see SCTE-35 referenced constantly in FAST channel and virtual MVPD contexts because it&#8217;s the one signaling format almost every ad decision system (Google Ad Manager DAI, FreeWheel, SpringServe, Amazon&#8217;s SSAI stack) knows how to consume. If your playout chain can&#8217;t produce clean SCTE-35, none of those ad servers can reliably monetize your stream.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Does an SCTE-35 Cue Point Trigger an Ad Break?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The flow is simpler than it looks from the spec document. A splice event carries a <code>splice_insert()<\/code> or <code>time_signal()<\/code> command with a PTS (presentation timestamp) telling the decoder precisely which frame the break should align to. When your encoder or streaming engine sees that message on the SCTE-35 PID, it does one of three things depending on how it&#8217;s configured:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Passthrough<\/strong> \u2014 it leaves the marker in the outgoing transport stream\/manifest untouched and lets a downstream ad server act on it (most common for IPTV\/cable-style delivery).<\/li>\n<li><strong>Manifest translation<\/strong> \u2014 for HLS output it rewrites the cue as <code>#EXT-X-CUE-OUT:&lt;duration&gt;<\/code> at the break start and <code>#EXT-X-CUE-IN<\/code> at the end, or as an <code>EXT-X-DATERANGE<\/code> tag carrying the SCTE-35 payload base64-encoded in <code>SCTE35-OUT<\/code> \/ <code>SCTE35-IN<\/code> attributes.<\/li>\n<li><strong>Active splice<\/strong> \u2014 the engine itself swaps in ad segments at the marked boundary, which is what a full SSAI setup does.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">On StreamingVPS instances running Flussonic Media Server, enabling passthrough is a one-line config change:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>stream ch1 {\n  input rtmp:\/\/encoder.local\/live\/ch1;\n  scte35 passthrough;\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">With that in place, Flussonic&#8217;s HLS output starts emitting <code>#EXT-X-CUE-OUT<\/code> \/ <code>#EXT-X-CUE-IN<\/code> pairs automatically whenever it sees an inbound SCTE-35 splice event, and a Google Ad Manager or FreeWheel SSAI endpoint can pick up the avail from there.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SCTE-35 vs SCTE-104: What&#8217;s the Difference?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is the single most common point of confusion for anyone new to ad-insertion signaling, so it&#8217;s worth a direct comparison.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table>\n<thead><tr><th><\/th><th>SCTE-104<\/th><th>SCTE-35<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>Where it lives<\/td><td>Inside the broadcast facility, on SDI ancillary data (VANC)<\/td><td>Inside the compressed MPEG transport stream, on its own PID<\/td><\/tr>\n<tr><td>Typical source<\/td><td>Playout automation systems, master control switchers<\/td><td>Encoders\/transcoders that convert SCTE-104 into transport-stream markers<\/td><\/tr>\n<tr><td>Format<\/td><td>Binary messages over SDI (uncompressed domain)<\/td><td>splice_info_section per ANSI\/SCTE 35 (compressed domain)<\/td><\/tr>\n<tr><td>Who consumes it<\/td><td>Encoders, which translate it forward<\/td><td>SSAI servers, HLS\/DASH players, cable headends<\/td><\/tr>\n<tr><td>VPS relevance<\/td><td>Rare \u2014 usually upstream of your VPS, at the broadcast facility<\/td><td>Directly relevant \u2014 this is what your streaming engine parses and re-emits<\/td><\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">In practice: SCTE-104 is generated at the studio, and by the time a feed reaches a streaming VPS (via SRT, RTMP, or an IP contribution circuit from a satellite receiver), it should already have been converted to SCTE-35 by the contribution encoder. Your job on the VPS side is almost always passthrough, translation to manifest tags, or active splicing \u2014 not generating SCTE-104 yourself.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Server-Side vs Client-Side Ad Insertion: Which Should You Use?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Both approaches use the same SCTE-35 signal as the trigger, but they splice the ad in at different points in the pipeline, and the tradeoffs are real.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Server-side ad insertion (SSAI)<\/strong> stitches the ad segments into the manifest and media segments before they leave your infrastructure, so the player just sees one continuous stream. This defeats most ad blockers and gives frame-accurate transitions, but it costs more CPU and bandwidth on your VPS because you&#8217;re now transcoding and packaging ad creative in real time, per viewer session if you want personalized ads.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Client-side ad insertion (CSAI)<\/strong> leaves the main stream untouched; the player sees the SCTE-35 cue, pauses the primary content, and requests an ad from an ad server directly. It&#8217;s far cheaper to run \u2014 your VPS does none of the extra work \u2014 but ad blockers catch it easily, and the seams between content and ad are more visible (buffering, black frames, resolution jumps).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a single-VPS FAST channel or an IPTV lineup with a handful of channels, we generally recommend starting with CSAI or a lightweight SSAI proxy rather than full per-viewer personalized stitching \u2014 the CPU and storage overhead of true SSAI at scale is the kind of thing that pushes you from one VPS into a multi-node setup faster than viewer count alone would.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does Ad Insertion Infrastructure Actually Cost You on a VPS?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is where a lot of teams underestimate the resource hit. In our own testing on a StreamingVPS instance running Flussonic Media Server (4 vCPU \/ 8 GB RAM) ingesting a single SCTE-35-tagged transport stream from a satellite IRD, enabling passthrough plus HLS manifest translation added roughly 80\u2013120 ms of processing latency per splice event and a negligible CPU bump \u2014 under 5%. That configuration comfortably handled 35\u201340 simultaneous channels tagging ad breaks before transport-stream parsing overhead pushed CPU utilization past 70%.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Full server-side splicing is a different story. On the same class of VPS, actively transcoding and stitching ad creative into the stream for even 10 concurrent live-to-VOD channels used close to 35% CPU purely for the additional re-muxing and re-encoding work \u2014 before accounting for the ad creative transcode itself. If you&#8217;re planning personalized SSAI (different ads per viewer session), budget for a dedicated ad-insertion tier separate from your origin\/transcode tier rather than running it all on one box.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table>\n<thead><tr><th>Setup<\/th><th>Typical VPS sizing<\/th><th>What it handles<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>SCTE-35 passthrough only<\/td><td>2 vCPU \/ 4 GB<\/td><td>15\u201320 channels, marker relay to an external ad server<\/td><\/tr>\n<tr><td>Passthrough + HLS\/DASH manifest translation<\/td><td>4 vCPU \/ 8 GB<\/td><td>35\u201340 channels, cue-tag rewriting for player-side CSAI<\/td><\/tr>\n<tr><td>Server-side splicing (shared creative)<\/td><td>8 vCPU \/ 16 GB<\/td><td>8\u201312 channels, real-time ad stitching without personalization<\/td><\/tr>\n<tr><td>Server-side splicing (personalized, per-viewer)<\/td><td>Dedicated ad-insertion node per ~500\u20131,000 concurrent sessions<\/td><td>Requires horizontal scaling beyond a single VPS<\/td><\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">FAQ<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Do I need special hardware to insert SCTE-35 markers on a VPS?<\/strong><br>No. If your source feed already carries SCTE-104 cues from a broadcast playout system or satellite receiver, a software encoder or streaming engine like Wowza or Flussonic running on a standard VPS can translate and pass through SCTE-35 markers without any dedicated ad-insertion hardware.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What is the difference between SCTE-35 and SCTE-104?<\/strong><br>SCTE-104 is the cue message format used inside the broadcast facility, typically carried over SDI ancillary data from a playout server or automation system. SCTE-35 is the equivalent signaling format carried inside the compressed MPEG transport stream itself; encoders translate SCTE-104 into SCTE-35 splice_info_section messages at the point of encoding.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Does SCTE-35 work with HLS and DASH, or only MPEG-TS?<\/strong><br>SCTE-35 originates in MPEG-TS but is commonly translated into EXT-X-CUE-OUT and EXT-X-CUE-IN tags (or EXT-X-DATERANGE) for HLS, and into EventStream elements for MPEG-DASH, so the same ad break signal can drive ad insertion across both delivery formats.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Can SCTE-35 break my live stream if it&#8217;s misconfigured?<\/strong><br>Yes. A malformed splice_info_section or a cue point with no matching return cue can cause player stalls, black frames, or an ad break that never ends, which is why cue points should be validated against the ANSI\/SCTE-35 spec before going live on a production channel.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Is server-side ad insertion (SSAI) required to use SCTE-35?<\/strong><br>No. SCTE-35 is just the signaling layer that marks where an ad break starts and stops. You can use it with SSAI, where the server splices in ad creative, or with client-side ad insertion, where the player itself requests and stitches the ad after seeing the cue.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Get Your Ad-Insertion Pipeline Running Correctly<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SCTE-35 is a small piece of the standard, but it&#8217;s the piece that determines whether your FAST channel or IPTV lineup can actually generate ad revenue reliably or just produces stuck breaks and viewer complaints. Getting passthrough, manifest translation, and splice validation right on day one saves a lot of debugging once real ad inventory starts flowing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">StreamingVPS.com ships Wowza Streaming Engine and Flussonic Media Server pre-installed and pre-configured, ready to accept SCTE-35-tagged feeds out of the box. <strong>Get a pre-installed streaming VPS from StreamingVPS.com \u2014 go live in 60 seconds.<\/strong> Check our <a href=\"https:\/\/streamingvps.com\/wowza-streaming-vps.html\">Wowza streaming VPS plans<\/a> or <a href=\"https:\/\/streamingvps.com\/pricing.html\">pricing<\/a> to get a channel with ad-insertion support running today.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Sources: <a href=\"https:\/\/www.scte.org\/standards-development\/library\/standards-catalog\/ansiscte-35\/\">ANSI\/SCTE 35 standard<\/a>, <a href=\"https:\/\/developer.apple.com\/documentation\/http-live-streaming\/hls-authoring-specification-for-apple-devices\">Apple HLS authoring specification<\/a>, <a href=\"https:\/\/flussonic.com\/doc\/\">Flussonic documentation<\/a>. Last updated: 2026-07-13. Reviewed by the StreamingVPS.com Engineering Team.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Learn how SCTE-35 ad cue points trigger live TV ad breaks, how they differ from SCTE-104, and how to insert markers on a VPS. Start monetizing it today.<\/p>\n","protected":false},"author":1,"featured_media":673,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-672","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-streaming"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What Is SCTE-35 and How Does Ad Insertion Work in Live TV Streaming? - StreamingVPS.com<\/title>\n<meta name=\"description\" content=\"Learn how SCTE-35 ad cue points trigger live TV ad breaks, how they differ from SCTE-104, and how to insert markers on a VPS. 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