--- title: "How we test video streaming: stalls and zap time | TEST4NET" description: "Video QoE on the CloudLAB bench: HLS and DASH players, IPTV channel change and MDI, video calls; start-up time, stalls and bitrate per viewer" image: https://test4net.com/hubfs/blog-covers/how-we-test-video-streaming-qoe.png --- [Skip to content](https://test4net.com/blog/how-we-test-video-streaming-qoe#main-content) [![TEST4NET](https://test4net.com/hubfs/test4net-logo-fixed-2.svg)](https://test4net.com/?hsLang=en) - Services - Products - Resources - Company - [English](https://test4net.com/blog/how-we-test-video-streaming-qoe) - [Русский](https://test4net.com/ru/blog/how-we-test-video-streaming-qoe) - [Հայերեն](https://test4net.com/hy/blog/how-we-test-video-streaming-qoe) [News](https://test4net.com/news?hsLang=en) [Login](https://lab.test4net.com) [Support](https://test4net.com/support?hsLang=en) - [English](https://test4net.com/blog/how-we-test-video-streaming-qoe) - [Русский](https://test4net.com/ru/blog/how-we-test-video-streaming-qoe) - [Հայերեն](https://test4net.com/hy/blog/how-we-test-video-streaming-qoe) What we test By technology Industries [Load & Performance Testing Throughput, sessions and latency up to and past the rated limit](https://test4net.com/services/load-performance-testing?hsLang=en) [Functional & Conformance Testing Features against the spec, RFC compliance with evidence](https://test4net.com/services/functional-conformance-testing?hsLang=en) [Interoperability Testing Multi-vendor behaviour, before it reaches production](https://test4net.com/services/interoperability-testing?hsLang=en) [Security & Resilience Testing NGFW, IPS and VPN efficacy and performance with threats on the wire](https://test4net.com/services/security-resilience-testing?hsLang=en) [Test Plan & Methodology Design What to test, how, and what counts as a pass](https://test4net.com/services/test-plan-design?hsLang=en) [Test Automation & CI/CD Regression suites wired into your release pipeline](https://test4net.com/services/test-automation?hsLang=en) [Training Programs Hands-on courses for your test engineers](https://test4net.com/services/training-programs?hsLang=en) [Equipment Repair Repair and verification of test equipment](https://test4net.com/services/equipment-repair?hsLang=en) [All services](https://test4net.com/services?hsLang=en) [Routing & Switching RFC 2544 and RFC 2889 on real ports, 1G to 100G](https://test4net.com/solutions/routing-switching?hsLang=en) [Firewalls & NGFW RFC 9411 throughput with inspection switched on](https://test4net.com/solutions/firewalls-ngfw?hsLang=en) [Load Balancers & ADC Connections, TLS and failover of the pair under load](https://test4net.com/solutions/load-balancers-adc?hsLang=en) [SD-WAN & WAN Path selection and QoS under emulated WAN conditions](https://test4net.com/solutions/sd-wan?hsLang=en) [Cloud & NFV Virtual appliances and cloud services under load](https://test4net.com/solutions/cloud-nfv?hsLang=en) [5G & Mobile Core Transport and core functions under subscriber traffic](https://test4net.com/solutions/5g-mobile-core?hsLang=en) [Wi-Fi Wi-Fi 6 clients and access points, Wi-Fi 7 in progress](https://test4net.com/solutions/wi-fi?hsLang=en) [Storage & Infrastructure Storage networks and servers under realistic I/O](https://test4net.com/solutions/storage?hsLang=en) [AI / Switching Fabric (RoCEv2) Lossless Ethernet for GPU clusters: PFC, ECN, fabric load](https://test4net.com/solutions/ai-fabric-rocev2?hsLang=en) [All technologies](https://test4net.com/services#coverage) [Telecom Operators Pre-deployment acceptance and vendor comparison](https://test4net.com/solutions/industries#telecom) [Network & Security Vendors Independent validation of your product claims](https://test4net.com/solutions/industries#vendors) [System Integrators Proof for the customer before the rollout](https://test4net.com/solutions/industries#integrators) [Enterprise & Banks Upgrades and new platforms checked before production](https://test4net.com/solutions/industries#enterprise) [All industries](https://test4net.com/solutions/industries?hsLang=en) Not sure where to start? Test plan and quote in 1–3 business days Tell us what you run and what worries you. We propose the tests, tools and timeline. [Request a test plan](https://test4net.com/contacts?hsLang=en) CloudLAB [How It Works Pick a scenario, run it in the live lab, get the report](https://test4net.com/cloudlab#how) [Equipment & Capabilities L2-3 to 100G, L4-7 past 200G, Wi-Fi, WAN emulation](https://test4net.com/cloudlab#equipment) [Access Plans Hourly sessions, subscriptions, dedicated racks](https://test4net.com/cloudlab/plans?hsLang=en) [Hosted DUT Testing Ship the box or upload the VM, we run the tests](https://test4net.com/cloudlab/hosted-dut?hsLang=en) [Open the CloudLAB portal](https://lab.test4net.com) Our tools [Traffic Generator L4-7 and security traffic past 200 Gbit/s, app mix library](https://test4net.com/products/traffic-generator?hsLang=en) [WANemu Delay, jitter, loss and bandwidth shaping per link](https://test4net.com/products/wanemu?hsLang=en) [Book a demo](https://test4net.com/contacts?hsLang=en) New: our own test tools Our own tools, in beta this autumn Built in our lab, priced per gigabit. Join the beta list and see them first. [Join the beta list](https://test4net.com/products#lead-form) Read Technologies / Protocols Methodologies [Blog Case studies, test insights and lab notes](https://test4net.com/blog?hsLang=en) [Industry News What is changing in network testing and infrastructure](https://test4net.com/news?hsLang=en) [FAQ How the lab, sessions and reports work](https://test4net.com/faq?hsLang=en) [Glossary Network testing terms in plain words](https://test4net.com/glossary?hsLang=en) [All resources](https://test4net.com/resources?hsLang=en) [BGP Route exchange, policy and convergence](https://test4net.com/blog/how-we-test-bgp?hsLang=en) [OSPF & IS-IS IGP adjacency, flooding and SPF timing](https://test4net.com/blog/how-we-test-ospf-is-is?hsLang=en) [MPLS & SR LDP, RSVP‑TE and SR‑MPLS label paths](https://test4net.com/blog/how-we-test-mpls-and-segment-routing?hsLang=en) [EVPN / VXLAN Overlay fabrics, MAC/IP routes, multi-homing](https://test4net.com/blog/how-we-test-evpn-vxlan?hsLang=en) [IPsec & IKEv2 Tunnel setup, rekeying and throughput](https://test4net.com/blog/how-we-test-ipsec-and-ikev2?hsLang=en) [TLS / HTTPS Handshakes, cipher suites and inspection](https://test4net.com/blog/how-we-test-tls-and-https?hsLang=en) [RoCEv2 Lossless Ethernet, PFC and ECN for AI fabrics](https://test4net.com/blog/how-we-test-rocev2?hsLang=en) [Wi-Fi 6 / 6E / 7 802.11ax/be, OFDMA, MLO and roaming](https://test4net.com/blog/how-we-test-wi-fi-6-6e-7?hsLang=en) [All protocols](https://test4net.com/blog/tag/protocols?hsLang=en) [RFC 2544 Throughput, latency, frame loss and back-to-back](https://test4net.com/methodologies/rfc-2544?hsLang=en) [RFC 2889 LAN switch benchmarking: forwarding, MAC learning, congestion](https://test4net.com/methodologies/rfc-2889?hsLang=en) [RFC 9411 / RFC 3511 Firewall and NGFW performance benchmarking](https://test4net.com/methodologies/rfc-9411-rfc-3511?hsLang=en) [RFC 6349 TCP throughput and buffer delay testing](https://test4net.com/methodologies/rfc-6349?hsLang=en) [RFC 5180 IPv6 benchmarking methodology](https://test4net.com/methodologies/rfc-5180?hsLang=en) [ITU-T Y.1564 Ethernet service activation: CIR, EIR, KPIs per service](https://test4net.com/methodologies/y-1564?hsLang=en) [ITU-T Y.1731 Ethernet OAM: delay, jitter, loss and SLA monitoring](https://test4net.com/methodologies/y-1731?hsLang=en) [TR-398 Wi-Fi in-premises performance test plan](https://test4net.com/methodologies/tr-398?hsLang=en) [All methodologies](https://test4net.com/methodologies?hsLang=en) Read [Case studies, test insights and lab notes Blog](https://test4net.com/blog?hsLang=en) [What is changing in network testing and infrastructure Industry News](https://test4net.com/news?hsLang=en) [How the lab, sessions and reports work FAQ](https://test4net.com/faq?hsLang=en) [Network testing terms in plain words Glossary](https://test4net.com/glossary?hsLang=en) [About Us Independent lab in Armenia, team and history](https://test4net.com/about?hsLang=en) [Why TEST4NET What you get that vendor slides never show](https://test4net.com/why-test4net?hsLang=en) [Lab & Certifications Bench capacity, methods and the standards we test against](https://test4net.com/lab?hsLang=en) [Partners Test tool vendors and IT partners we work with](https://test4net.com/partners?hsLang=en) [Contacts Talk to an engineer, not a sales bot](https://test4net.com/contacts?hsLang=en) [Support portal](https://test4net.com/support?hsLang=en) - Services What we test [Load & Performance Testing](https://test4net.com/services/load-performance-testing?hsLang=en) [Functional & Conformance Testing](https://test4net.com/services/functional-conformance-testing?hsLang=en) [Interoperability Testing](https://test4net.com/services/interoperability-testing?hsLang=en) [Security & Resilience Testing](https://test4net.com/services/security-resilience-testing?hsLang=en) [Test Plan & Methodology Design](https://test4net.com/services/test-plan-design?hsLang=en) [Test Automation & CI/CD](https://test4net.com/services/test-automation?hsLang=en) [Training Programs](https://test4net.com/services/training-programs?hsLang=en) [Equipment Repair](https://test4net.com/services/equipment-repair?hsLang=en) [All services](https://test4net.com/services?hsLang=en) By technology [Routing & Switching](https://test4net.com/solutions/routing-switching?hsLang=en) [Firewalls & NGFW](https://test4net.com/solutions/firewalls-ngfw?hsLang=en) [Load Balancers & ADC](https://test4net.com/solutions/load-balancers-adc?hsLang=en) [SD-WAN & WAN](https://test4net.com/solutions/sd-wan?hsLang=en) [Cloud & NFV](https://test4net.com/solutions/cloud-nfv?hsLang=en) [5G & Mobile Core](https://test4net.com/solutions/5g-mobile-core?hsLang=en) [Wi-Fi](https://test4net.com/solutions/wi-fi?hsLang=en) [Storage & Infrastructure](https://test4net.com/solutions/storage?hsLang=en) [AI / Switching Fabric (RoCEv2)](https://test4net.com/solutions/ai-fabric-rocev2?hsLang=en) [All technologies](https://test4net.com/services#coverage) Industries [Telecom Operators](https://test4net.com/solutions/industries#telecom) [Network & Security Vendors](https://test4net.com/solutions/industries#vendors) [System Integrators](https://test4net.com/solutions/industries#integrators) [Enterprise & Banks](https://test4net.com/solutions/industries#enterprise) [All industries](https://test4net.com/solutions/industries?hsLang=en) [Not sure where to start? Test plan and quote in 1–3 business days](https://test4net.com/contacts?hsLang=en) - Products CloudLAB [How It Works](https://test4net.com/cloudlab#how) [Equipment & Capabilities](https://test4net.com/cloudlab#equipment) [Access Plans](https://test4net.com/cloudlab/plans?hsLang=en) [Hosted DUT Testing](https://test4net.com/cloudlab/hosted-dut?hsLang=en) [Open the CloudLAB portal](https://lab.test4net.com) Our tools [Traffic Generator](https://test4net.com/products/traffic-generator?hsLang=en) [WANemu](https://test4net.com/products/wanemu?hsLang=en) [Book a demo](https://test4net.com/contacts?hsLang=en) [New: our own test tools Our own tools, in beta this autumn](https://test4net.com/products#lead-form) - Resources Read [Blog](https://test4net.com/blog?hsLang=en) [Industry News](https://test4net.com/news?hsLang=en) [FAQ](https://test4net.com/faq?hsLang=en) [Glossary](https://test4net.com/glossary?hsLang=en) [All resources](https://test4net.com/resources?hsLang=en) Technologies / Protocols [BGP](https://test4net.com/blog/how-we-test-bgp?hsLang=en) [OSPF & IS-IS](https://test4net.com/blog/how-we-test-ospf-is-is?hsLang=en) [MPLS & SR](https://test4net.com/blog/how-we-test-mpls-and-segment-routing?hsLang=en) [EVPN / VXLAN](https://test4net.com/blog/how-we-test-evpn-vxlan?hsLang=en) [IPsec & IKEv2](https://test4net.com/blog/how-we-test-ipsec-and-ikev2?hsLang=en) [TLS / HTTPS](https://test4net.com/blog/how-we-test-tls-and-https?hsLang=en) [RoCEv2](https://test4net.com/blog/how-we-test-rocev2?hsLang=en) [Wi-Fi 6 / 6E / 7](https://test4net.com/blog/how-we-test-wi-fi-6-6e-7?hsLang=en) [All protocols](https://test4net.com/blog/tag/protocols?hsLang=en) Methodologies [RFC 2544](https://test4net.com/methodologies/rfc-2544?hsLang=en) [RFC 2889](https://test4net.com/methodologies/rfc-2889?hsLang=en) [RFC 9411 / RFC 3511](https://test4net.com/methodologies/rfc-9411-rfc-3511?hsLang=en) [RFC 6349](https://test4net.com/methodologies/rfc-6349?hsLang=en) [RFC 5180](https://test4net.com/methodologies/rfc-5180?hsLang=en) [ITU-T Y.1564](https://test4net.com/methodologies/y-1564?hsLang=en) [ITU-T Y.1731](https://test4net.com/methodologies/y-1731?hsLang=en) [TR-398](https://test4net.com/methodologies/tr-398?hsLang=en) [All methodologies](https://test4net.com/methodologies?hsLang=en) Read [Blog Case studies, test insights and lab notes](https://test4net.com/blog?hsLang=en) [Industry News What is changing in network testing and infrastructure](https://test4net.com/news?hsLang=en) [FAQ How the lab, sessions and reports work](https://test4net.com/faq?hsLang=en) [Glossary Network testing terms in plain words](https://test4net.com/glossary?hsLang=en) - Company [About Us](https://test4net.com/about?hsLang=en) [Why TEST4NET](https://test4net.com/why-test4net?hsLang=en) [Lab & Certifications](https://test4net.com/lab?hsLang=en) [Partners](https://test4net.com/partners?hsLang=en) [Contacts](https://test4net.com/contacts?hsLang=en) [News](https://test4net.com/news?hsLang=en) [Login](https://lab.test4net.com) [Support](https://test4net.com/support?hsLang=en) [All articles](https://test4net.com/blog) [Standards and methodology](https://test4net.com/blog/tag/standards-and-methodology) [Telecom and WAN](https://test4net.com/blog/tag/telecom-and-wan) # How we test video QoE: start-up, stalls and channel zap time ![](https://test4net.com/hubfs/IMG_0070.jpg) [Alexander Zemskov](https://test4net.com/blog/author/az) October 30, 2026 4 min read [English](https://test4net.com/blog/how-we-test-video-streaming-qoe) [Русский](https://test4net.com/ru/blog/how-we-test-video-streaming-qoe) [Հայերեն](https://test4net.com/hy/blog/how-we-test-video-streaming-qoe) ![How we test video QoE: start-up, stalls and channel zap time](https://test4net.com/hs-fs/hubfs/blog-covers/how-we-test-video-streaming-qoe.png?width=1600&height=900&name=how-we-test-video-streaming-qoe.png) In this article A link passes its throughput test at the full subscribed rate, and the viewers on it still watch a spinner. A throughput test sends a steady stream. A video player works differently: it pulls a segment in a burst, measures how long the download took and picks the next bitrate from that. An IPTV box shows a channel only after its IGMP join is served. We score every emulated viewer by what a person on the couch would notice: seconds to the first frame, stalls, the bitrate the player settles on, the time a channel change takes. ## The bench The device under test sits on the video path: a CDN edge cache, a BNG or BRAS, a home CPE, a Wi-Fi access point, an SD-WAN edge, a mobile core user plane, or a WAN link with its faults turned on. The bench emulates viewers in three forms. HLS and DASH players fetch manifests and segments over HTTPS from an origin behind the device and switch bitrate by buffer level and download time. Set-top boxes join and leave multicast IPTV channels with IGMP. Video call endpoints send real-time video in both directions. The [traffic generator](https://test4net.com/products/traffic-generator?hsLang=en) fills the rest of the link with web, VoIP and file transfer flows, weighted by your traffic profile. [WANemu](https://test4net.com/products/wanemu?hsLang=en), in beta on 1G and 10G links, adds delay, jitter and loss per direction, random or in bursts. The player profiles, the bitrate ladder and the channel lineup are yours. ## What we check - Start-up: time from the play request to the first frame, per player and as percentiles across viewers at your evening peak - Stalls: rebuffering events per session and their total time, on the ramp and at the peak - Bitrate: the profile each player settles on, the share of the session at the top profile, how often it steps down - Edge cache: segment response time when viewers start the same live event at once - Channel change: zap time from the IGMP join to the new channel, and the leave that stops the old one, with many set-top boxes zapping together - Multicast quality: MDI per channel per second, delay factor and media loss rate (RFC 4445) - Video calls: freeze time, received frame rate, loss and jitter per call in both directions - Impairment: the same set with delay, jitter and burst loss on the link and bulk traffic filling it, QoS on ## What usually breaks A policer with a shallow bucket on a BNG or CPE. A player fetches each segment in a burst at line rate, the policer cuts off the head of the burst, TCP backs off, and the segment arrives later than its playback time allows. The player reads that as a slow network and steps down. In a typical project a 50 Mbit/s profile carried its full rate in the throughput test, and a 4K player on it spent a third of the session one profile below the top. A larger burst size brought it back. IGMP at the top of the hour. On an idle node a join takes tens of milliseconds, and a zap test with one box passes. When many boxes change channel at once, joins queue in the control plane and zap time grows past a second. A missing fast leave makes it worse: the old channel keeps flowing on the access line until the query timer runs out, two HD channels share a line sized for one, and MDI shows media loss on both. Loss in bursts. A video call rides through 1 % random loss: FEC and concealment cover it. The same 1 % arriving in bursts, as on a busy Wi-Fi cell or a radio link, freezes the picture for a fraction of a second each time. On the [Wi-Fi bench](https://test4net.com/solutions/wi-fi?hsLang=en) it shows up as the cell fills to the design client count; on a WAN link, as burst loss on the Gilbert–Elliott model. A run with random loss at the same average misses it. ## What is in the report Start-up time, stalls and bitrate per player, with percentiles across viewers. Zap time per channel against the join rate. MDI delay factor and media loss rate per channel per second. Freeze time and frame rate per call. All on one timeline with the impairment and the device counters, plus the player settings, the ladder and the emulator values, so the same evening replays on the next firmware. ## Where to start Send us the devices on the video path, the bitrate ladder or the channel lineup and your peak viewer count. We answer with a draft test plan: the items, the bench layout and the dates. The report is yours to keep and to show to the vendor. [Write to us](https://test4net.com/contacts?hsLang=en) or look at [what else the bench does](https://test4net.com/services?hsLang=en). Share Pass it on to someone who runs a network Independent lab data is most useful in the hands of the people who make the call. Send this piece to a colleague. [LinkedIn](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Ftest4net.com%2Fblog%2Fhow-we-test-video-streaming-qoe) [X](https://twitter.com/intent/tweet?url=https%3A%2F%2Ftest4net.com%2Fblog%2Fhow-we-test-video-streaming-qoe&text=How+we+test+video+QoE%3A+start-up%2C+stalls+and+channel+zap+time) [Telegram](https://t.me/share/url?url=https%3A%2F%2Ftest4net.com%2Fblog%2Fhow-we-test-video-streaming-qoe&text=How+we+test+video+QoE%3A+start-up%2C+stalls+and+channel+zap+time) [WhatsApp](https://wa.me/?text=How+we+test+video+QoE%3A+start-up%2C+stalls+and+channel+zap+time%20https%3A%2F%2Ftest4net.com%2Fblog%2Fhow-we-test-video-streaming-qoe) Copy link More apps ![](https://test4net.com/hubfs/IMG_0070.jpg) Written by ### [Alexander Zemskov](https://test4net.com/blog/author/az) Alexander Zemskov leads network and security testing at TEST4NET, an independent, vendor-neutral testing lab in Yerevan, Armenia. With 19+ years in performance and load testing on IXIA, Spirent, Keysight, Xena and Xinertel platforms, he runs NGFW, WAF, IPS, DLP and SASE evaluations for telecom operators, banks and system integrators. [LinkedIn](https://www.linkedin.com/in/azemskov/) [Website](https://test4net.com/?hsLang=en) [Previous article How we test voice quality: every call scored, every second](https://test4net.com/blog/how-we-test-voice-quality?hsLang=en) [Next article How we test application QoE: transaction time per user](https://test4net.com/blog/how-we-test-application-qoe?hsLang=en) In this article On the bench ### Have a device to put through this? Send us the shortlist and the KPIs that decide it. We will come back with a scoped test plan, a timeline and a fixed price. [Talk to a test engineer](https://test4net.com/contacts?hsLang=en) Blog ## Keep reading [![How we measure power under load: watts per Gbps at 4 load steps](https://test4net.com/hs-fs/hubfs/blog-covers/how-we-measure-power-under-load.png?width=880&height=550&name=how-we-measure-power-under-load.png)](https://test4net.com/blog/how-we-measure-power-under-load?hsLang=en) [Standards and methodology](https://test4net.com/blog/tag/standards-and-methodology) ### [How we measure power under load: watts per Gbps at 4 load steps](https://test4net.com/blog/how-we-measure-power-under-load?hsLang=en) The datasheet of a switch, router or firewall gives two power figures: "typical" and "maximum". Neither says at what load, with which optics or at what inlet temperature.… ![](https://test4net.com/hs-fs/hubfs/IMG_0070.jpg?width=22&height=22&name=IMG_0070.jpg) Alexander Zemskov Oct 30, 2026 · 5 min read [![How we test remote-access VPN: 9:00 logins, MFA and failover](https://test4net.com/hs-fs/hubfs/blog-covers/how-we-test-remote-access-vpn.png?width=880&height=550&name=how-we-test-remote-access-vpn.png)](https://test4net.com/blog/how-we-test-remote-access-vpn?hsLang=en) [Security](https://test4net.com/blog/tag/security-performance) ### [How we test remote-access VPN: 9:00 logins, MFA and failover](https://test4net.com/blog/how-we-test-remote-access-vpn?hsLang=en) A VPN concentrator datasheet gives a user count and a throughput figure, both taken separately: thousands of idle tunnels for the first, a few fat ones for the second. A … ![](https://test4net.com/hs-fs/hubfs/IMG_0070.jpg?width=22&height=22&name=IMG_0070.jpg) Alexander Zemskov Oct 30, 2026 · 5 min read [![How we test IPv6 and transition: dual stack, NAT64, 464XLAT](https://test4net.com/hs-fs/hubfs/blog-covers/how-we-test-ipv6-transition.png?width=880&height=550&name=how-we-test-ipv6-transition.png)](https://test4net.com/blog/how-we-test-ipv6-transition?hsLang=en) [Routing and switching](https://test4net.com/blog/tag/routing-and-switching) ### [How we test IPv6 and transition: dual stack, NAT64, 464XLAT](https://test4net.com/blog/how-we-test-ipv6-transition?hsLang=en) A router datasheet shows IPv6 as a tick next to IPv4, with one throughput figure for both. On the bench the two protocols often part ways: at small packets, with an exten… ![](https://test4net.com/hs-fs/hubfs/IMG_0070.jpg?width=22&height=22&name=IMG_0070.jpg) Alexander Zemskov Oct 30, 2026 · 4 min read [![TEST4NET LLC](https://test4net.com/hubfs/test4net-logo-fixed.svg)](https://test4net.com?hsLang=en) Independent testing and validation for telecom, information security and cloud infrastructure – real insights, not assumptions [mailto:sales@test4net.com](mailto:sales@test4net.com) #### Navigate - [Home](https://test4net.com/?hsLang=en) - [Why TEST4NET](https://test4net.com/why-test4net?hsLang=en) - [About us](https://test4net.com/about?hsLang=en) - [Contact](https://test4net.com/contacts?hsLang=en) - [Blog](https://test4net.com/blog?hsLang=en) - [Industry News](https://test4net.com/news?hsLang=en) #### Get in touch Sales [sales@test4net.com](mailto:sales@test4net.com) Support [support.test4net.com](https://support.test4net.com) © 2026 TEST4NET LLC. All rights reserved. [Privacy Policy](https://test4net.com/privacy-policy?hsLang=en) [Legal](https://test4net.com/legal?hsLang=en) ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Alexander Zemskov", "url" : "https://test4net.com/blog/author/az" }, "dateModified" : "2026-10-30T03:37:25.781Z", "datePublished" : "2026-10-30T03:37:25.000Z", "headline" : "How we test video streaming: stalls and zap time | TEST4NET", "image" : [ "https://test4net.com/hubfs/blog-covers/how-we-test-video-streaming-qoe.png" ], "mainEntityOfPage" : { "@id" : "https://test4net.com/blog/how-we-test-video-streaming-qoe", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://test4net.com/hubfs/test4net-logo-fixed.svg" }, "name" : "TEST4NET LLC" } } ``` ```json { "@context" : "https://schema.org", "@id" : "https://test4net.com/#organization", "@type" : "Organization", "address" : { "@type" : "PostalAddress", "addressCountry" : "AM", "addressLocality" : "Yerevan", "postalCode" : "0033", "streetAddress" : "3 Hakob Hakobyan Street (Mergelyan Hub)" }, "alternateName" : "TEST4NET", "contactPoint" : { "@type" : "ContactPoint", "availableLanguage" : [ "en", "ru", "hy" ], "contactType" : "sales", "email" : "sales@test4net.com", "telephone" : "+374-60-88-88-99" }, "description" : "Independent, vendor-neutral lab for testing network and cybersecurity products — NGFW, WAF, IPS, DLP and SASE — and an authorized distributor of test, measurement and network infrastructure solutions.", "email" : "sales@test4net.com", "foundingDate" : "2024", "image" : "https://test4net.com/hubfs/og-t4n.png", "logo" : "https://test4net.com/hubfs/test4net-logo-fixed-2.svg", "name" : "TEST4NET LLC", "sameAs" : [ "https://www.linkedin.com/company/test4net/", "https://t.me/TEST4NET", "https://www.facebook.com/people/Test4net-LLC/61591470856077/" ], "telephone" : "+374-60-88-88-99", "url" : "https://test4net.com/" } ``` ```json { "@context" : "https://schema.org", "@id" : "https://test4net.com/#website", "@type" : "WebSite", "inLanguage" : "en", "name" : "TEST4NET", "potentialAction" : { "@type" : "SearchAction", "query-input" : "required name=search_term_string", "target" : { "@type" : "EntryPoint", "urlTemplate" : "https://test4net.com/hs-search-results?term={search_term_string}" } }, "publisher" : { "@id" : "https://test4net.com/#organization" }, "url" : "https://test4net.com/" } ``` ```json { "@context" : "https://schema.org", "@type" : "BreadcrumbList", "itemListElement" : [ { "@type" : "ListItem", "item" : "https://test4net.com/", "name" : "TEST4NET", "position" : 1 }, { "@type" : "ListItem", "item" : "https://test4net.com/blog", "name" : "Blog", "position" : 2 }, { "@type" : "ListItem", "item" : "https://test4net.com/blog/how-we-test-video-streaming-qoe", "name" : "How we test video QoE: start-up, stalls and channel zap time", "position" : 3 } ] } ```