Change:
I made one change to the links, because this gets a 404: URL But a web search for "SCTE-214-1" found this instead, which seems to be a new location for the same thing: URL Additionally, There were 3 more links that failed check-URL URL URL URL All of these get something with chrome, but fail with curl. The datazoom links get a 403 and the iabtechlab gets a 406. (Changing the UA header to match chrome's made curl succeed with iabtechlab, but not the datazoom links. Didn't dig deeper yet.) I haven't put in automation for this, but I figure it's useful to have something at least to do a quick scan.
This works. These work just fine for me on chrome no 403 or 406, plain 200.
They work for me in chrome also, but they don't work in curl or wget so the script complains about them.
Looks good to me, modulo a Github Action error that we don't understand. Will merge now, so we can move forward.
Just make the change for ACM Mile-High Video Conference.

Discussion:
8. <del> Editor's note: This section is to be kept in a living document where future references, links and/or updates to the existing references will be reflected.  That living document is likely to be an IETF- owned Wiki: https://tinyurl.com/streaming-opcons-reading </del> <ins> The Media Operations community maintains a list of references and resources for further reading at this location: </ins> <del> 8.1. </del> <ins> https://github.com/ietf-wg-mops/draft-ietf-mops-streaming- opcons/blob/main/living-doc-mops-streaming-opcons.md [4] </ins> <del> SVA Glossary: https://glossary.streamingvideoalliance.org/ Datazoom Video Player Data Dictionary: https://help.datazoom.io/hc/en-us/articles/360031323311 Datazoom Video Metrics Encyclopedia: https://help.datazoom.io/hc/ en-us/articles/360046177191 8.2. 8.2.1. The following papers describe how video is encoded, different video encoding standards and tradeoffs in selecting encoding parameters. Overview of the Versatile Video Coding (VVC) Standard and its Applications (https://ieeexplore.ieee.org/document/9503377) Video Compression - From Concepts to the H.264/AVC Standard (https://ieeexplore.ieee.org/document/1369695) Developments in International Video Coding Standardization After AVC, With an Overview of Versatile Video Coding (VVC) (https://ieeexplore.ieee.org/document/9328514) A Technical Overview of AV1 (https://ieeexplore.ieee.org/ document/9363937) CTU Depth Decision Algorithms for HEVC: A Survey (https://arxiv.org/abs/2104.08328) 8.2.2. The following papers summarize the methods for selecting packaging configurations such as the resolution-bitrate pairs, segment durations, use of constant vs. variable-duration segments, etc. Deep Reinforced Bitrate Ladders for Adaptive Video Streaming (https://dl.acm.org/doi/10.1145/3458306.3458873) Comparing Fixed and Variable Segment Durations for Adaptive Video Streaming: a Holistic Analysis (https://dl.acm.org/ doi/10.1145/3339825.3391858) 8.2.3. The following links describe some of the issues and solutions regarding the interconnecting of the content delivery networks. Open Caching: Open standards for Caching in ISP Networks: https://www.streamingvideoalliance.org/working-group/open-caching/ Netflix Open Connect: https://openconnect.netflix.com 8.2.4. The two surveys describe and compare different rate-adaptation algorithms in terms of different metrics like achieved bitrate/ quality, stall rate/duration, bitrate switching frequency, fairness, network utilization, etc. A Survey on Bitrate Adaptation Schemes for Streaming Media Over HTTP (https://ieeexplore.ieee.org/document/8424813) A Survey of Rate Adaptation Techniques for Dynamic Adaptive Streaming Over HTTP (https://ieeexplore.ieee.org/document/7884970) 8.2.5. The following papers describe the peculiarities of adaptive streaming in low-latency live streaming scenarios. Catching the Moment with LoL+ in Twitch-like Low-latency Live Streaming Platforms (https://ieeexplore.ieee.org/document/9429986) Data-driven Bandwidth Prediction Models and Automated Model Selection for Low Latency (https://ieeexplore.ieee.org/ document/9154522) Performance Analysis of ACTE: A Bandwidth Prediction Method for Low-latency Chunked Streaming (https://dl.acm.org/ doi/10.1145/3387921) Online Learning for Low-latency Adaptive Streaming (https://dl.acm.org/doi/10.1145/3339825.3397042) Tightrope Walking in Low-latency Live Streaming: Optimal Joint Adaptation of Video Rate and Playback Speed (https://dl.acm.org/ doi/10.1145/3458305.3463382) Content-aware Playback Speed Control for Low-latency Live Streaming of Sports (https://dl.acm.org/ doi/10.1145/3458305.3478437) 8.2.6. The following papers explain the benefits of server and network assistance in client-driven streaming systems.  There is also a good reference about how congestion affects video quality and how rate control works in streaming applications. Manus Manum Lavat: Media Clients and Servers Cooperating with Common Media Client/Server Data (https://dl.acm.org/ doi/10.1145/3472305.3472886) Common media client data (CMCD): initial findings (https://dl.acm.org/doi/10.1145/3458306.3461444) SDNDASH: Improving QoE of HTTP Adaptive Streaming Using Software Defined Networking (https://dl.acm.org/ doi/10.1145/2964284.2964332) Caching in HTTP Adaptive Streaming: Friend or Foe? (https://dl.acm.org/doi/10.1145/2578260.2578270) A Survey on Multi-Access Edge Computing Applied to Video Streaming: Some Research Issues and Challenges (https://ieeexplore.ieee.org/document/9374553) The Ultimate Guide to Internet Congestion Control (https://www.compiralabs.com/ultimate-guide-congestion-control) 8.2.7. The following papers describe various QoE metrics one can use in streaming applications. QoE Management of Multimedia Streaming Services in Future Networks: a Tutorial and Survey (https://ieeexplore.ieee.org/ document/8930519) A Survey on Quality of Experience of HTTP Adaptive Streaming (https://ieeexplore.ieee.org/document/6913491) QoE Modeling for HTTP Adaptive Video Streaming-A Survey and Open Challenges (https://ieeexplore.ieee.org/document/8666971) 8.2.8. The following papers explain the latest developments in the immersive media domain (for video and audio) and the developing standards for such media. A Survey on Adaptive 360o Video Streaming: Solutions, Challenges and Opportunities (https://ieeexplore.ieee.org/document/9133103) MPEG Immersive Video Coding Standard (https://ieeexplore.ieee.org/ document/9374648) Emerging MPEG Standards for Point Cloud Compression (https://ieeexplore.ieee.org/document/8571288) Compression of Sparse and Dense Dynamic Point Clouds--Methods and Standards (https://ieeexplore.ieee.org/document/9457097) MPEG Standards for Compressed Representation of Immersive Audio (https://ieeexplore.ieee.org/document/9444109) An Overview of Omnidirectional MediA Format (OMAF) (https://ieeexplore.ieee.org/document/9380215) From Capturing to Rendering: Volumetric Media Delivery with Six Degrees of Freedom (https://ieeexplore.ieee.org/document/9247522) 8.3. 5G-MA: https://www.5g-mag.com/reference-tools dash.js: http://reference.dashif.org/dash.js/latest/samples/ DASH-IF Conformance: https://conformance.dashif.org ExoPlayer: https://github.com/google/ExoPlayer FFmpeg: https://www.ffmpeg.org/ GPAC: https://gpac.wp.imt.fr/ hls.js: https://github.com/video-dev/hls.js OBS Studio: https://obsproject.com/ Shaka Player: https://github.com/google/shaka-player Shaka Packager: https://github.com/google/shaka-packager Traffic Control CDN: https://trafficcontrol.apache.org/ VideoLAN: https://www.videolan.org/projects/ video.js: https://github.com/videojs/video.js 8.4. ACM Mile High Video (MHV): https://mile-high.video/ ACM Multimedia Systems (MMSys): https://acmmmsys.org ACM Multimedia (MM): https://acmmm.org ACM NOSSDAV: https://www.nossdav.org/ ACM Packet Video: https://packet.video/ Demuxed and meetups: https://demuxed.com/ and https://demuxed.com/ events/ DVB World: https://www.dvbworld.org EBU BroadThinking: https://tech.ebu.ch/events/broadthinking2021 IBC Conference: https://show.ibc.org/conference/ibc-conference IEEE Int. Conf. on Multimedia and Expo (ICME) Media Web Symposium: https://www.fokus.fraunhofer.de/de/go/mws Live Video Stack: https://sh2021.livevideostack.com Picture Coding Symp.  (PCS) SCTE Expo: https://expo.scte.org/ 8.5. 3GPP SA4: https://www.3gpp.org/specifications-groups/sa-plenary/ sa4-codec 5G-MAG: https://www.5g-mag.com/ AOM: http://aomedia.org/ ATSC: https://www.atsc.org/ CTA WAVE: https://cta.tech/Resources/Standards/WAVE-Project DASH Industry Forum: https://dashif.org/ DVB: https://dvb.org/ HbbTV: https://www.hbbtv.org/ HESP Alliance: https://www.hespalliance.org/ IAB: https://www.iab.com/ MPEG: https://www.mpegstandards.org/ Streaming Video Alliance: https://www.streamingvideoalliance.org/ SCTE: https://www.scte.org/ SMPTE: https://www.smpte.org/ SRT Alliance: https://www.srtalliance.org/ Video Services Forum: https://vsf.tv/ VQEG: https://www.its.bldrdoc.gov/vqeg/vqeg-home.aspx W3C: https://www.w3.org/ 8.6. 8.6.1. 5G new radio and systems technologies provide new functionalities for video distribution. 5G targets not only smartphones, but also new devices such as augmented reality glasses or automotive receivers. Higher bandwidth, lower latencies, edge and cloud computing functionalities, service-based architectures, low power consumption, broadcast/multicast functionalities and other network functions come hand in hand with new media formats and processing capabilities promising better and more consistent quality for traditional video streaming services as well as enabling new experiences such as immersive media and augmented realities. 5G Multimedia Standardization (https://www.riverpublishers.com/ journal_read_html_article.php?j=JICTS/6/1/8) 8.6.2. Ads can be inserted at different stages in the streaming workflow, on the server side or client side.  The DASH-IF guidelines detail server-side ad-insertion with period replacements based on manipulating the manifest.  HLS interstitials provide a similar approach.  The idea is that the manifest can be changed and point to a sub-playlist of segments, possibly located on a different location. This approach results in efficient resource usage in the network, as duplicate caching is avoided, but some intelligence at the player is needed to deal with content transitions (e.g., codec changes, timeline gaps, etc.).  Player support for such content is gradually maturing.  Other important technologies for ad insertion include signalling of ads and breaks that is still typically based on SCTE-35 for HLS and SCTE-214 for DASH.  Such signals provide useful information for scheduling the ads and contacting ad servers.  The usage of SCTE-35 for ad insertion is popular in the broadcast industry, while the exact usage in the OTT space is still being discussed in SCTE.  Another important technology is identification of ads, such as based on ad-id or other commercial entities that provide such services.  The identification of the ad in a manifest or stream is usually standardized by SMPTE.  Other key technologies for ad insertion include tracking of viewer impressions, usually based on Video Ad Serving Template (VAST) defined by IAB. DASH-IF Ad Insertion Guidelines: https://dashif.org/docs/CR-Ad- Insertion-r7.pdf SCTE-214-1: https://www.scte.org/standards-development/library/ standards-catalog/ansiscte-214-1-2016/ RP 2092-1:2015 - SMPTE Recommended Practice - Advertising Digital Identifier (Ad-ID) Representations: https://ieeexplore.ieee.org/ document/7291518 IAB Tech Lab Digital Video Studio: https://iabtechlab.com/audio- video/tech-lab-digital-video-suite/ 8.6.3. There are different contribution and ingest specifications dealing with different use cases.  A common case is contribution that previously happened over satellite to a broadcast or streaming headend.  RIST and SRT are examples of such contribution protocols. Within a streaming headend the encoder and packager/CDN may have an ingest/contribution interface as well.  This is specified by the DASH-IF Ingest. DASH-IF Ingest: https://github.com/Dash-Industry-Forum/Ingest RIST: https://www.rist.tv/ SRT: https://github.com/Haivision/srt 8.6.4. Practical streaming headends need redundant encoders and packagers to operate without glitches and blackouts.  The redundant operation requires synchronization between two or more encoders and also between two or more packagers that possibly handle different inputs and outputs, generating compatible inter-changeable output representations.  This problem is important for anyone developing a streaming headend at scale, and the synchronization problem is currently under discussion in the wider community.  Follow the developments at: https://sites.google.com/view/encodersyncworkshop/ home 8.6.5. WebRTC is increasingly being used for streaming of time-sensitive content such as live sporting events.  Innovations in cloud computing allow implementers to efficiently scale delivery of content using WebRTC.  Support for WebRTC communication is available on all modern web browsers and is available on native clients for all major platforms. DASH-IF WebRTC Discussions: https://dashif.org/webRTC/ Overview of WebRTC: https://webrtc.org/ </del> <ins> Editor's note: The link above might or might not be changed during IESG Evaluation.  See https://github.com/ietf-wg-mops/draft-ietf- mops-streaming-opcons/issues/114 [5] for updates. </ins> 9.

11. Thanks to Alexandre Gouaillard, Aaron Falk, Chris Lemmons, Dave Oran, <del> Glenn Deen, Kyle Rose, Leslie Daigle, Lucas Pardue, Mark Nottingham, Matt Stock, Mike English, Renan Krishna, Roni Even, Sanjay Mishra, and Will Law for very helpful suggestions, reviews and comments. </del> <ins> Eric Vyncke, Glenn Deen, Kyle Rose, Leslie Daigle, Lucas Pardue, Mark Nottingham, Matt Stock, Mike English, Renan Krishna, Roni Even, Sanjay Mishra, and Will Law for very helpful suggestions, reviews and comments. </ins> 12.  References

[2] https://www.ietf.org/mailman/listinfo/mops [3] https://mailarchive.ietf.org/arch/browse/mops/ <ins> [4] https://github.com/ietf-wg-mops/draft-ietf-mops-streaming- opcons/blob/main/living-doc-mops-streaming-opcons.md [5] https://github.com/ietf-wg-mops/draft-ietf-mops-streaming-opcons/ issues/114 </ins>