# Document history for user guide The following table describes the main changes to the documentation for AWS Elemental Live. For notification about updates to this documentation, you can subscribe to an RSS feed. | Change | Description | Date | | --- |--- |--- | | [New section about data generation](el-security.md#live-security-data-generated) | The guide now includes a section with information about the data generated by the use of AWS Elemental Conductor Live. | September 10, 2025 | | [New way to work with SMPTE 2110 with NMOS](setup-2110-input-nmos.md) | The guide now includes information about working with SMPTE 2110 using NMOS. The implementation of NMOS was completely changed in 2024. The guide now describes the new implementation. | July 1, 2025 | | [SMPTE 2110 with NMOS and AWS Elemental Conductor Live](SMPTE-ST-2110.md) | The user guide now includes a note to clarify a constraint with AWS Elemental Conductor Live. You can't use AWS Elemental Conductor Live to set up SMPTE 2110 inputs that use NMOS or to produce SMPTE 2110 outputs that use NMOS. | April 10, 2023 | | [Delivering low-latency HLS output to MediaPackage](output-empV4.md) | Starting with version 2.25.0, Elemental Live supports delivery of an HLS output to an AWS Elemental MediaPackage channel that uses MediaPackage v2. The HLS output delivered to MediaPackage v2 is typically (but not necessarily) part of a glass-to-glass low latency workflow. | April 10, 2023 | | [Working with SRT input](input-srt.md) | We fixed an error where we referred to the upstream system as the SRT caller. With an SRT input, the upstream system is always the sender and the SRT listener. Elemental Live is always the receiver and the SRT caller. | November 10, 2022 | | [RTMP inputs](supported-inputs-live-types.md) | The guide has been revised to clarify that AWS Elemental Live supports both RTMP push and RTMP pull inputs. | September 23, 2022 | | [Revision to output locking section](output-locking.md) | The section on implementing output locking and epoch locking has been completely revised. | July 15, 2022 | | [SWF files deprecated](motion-graphic-overlay.md) | We have removed information about using SWF with motion graphic overlays. Adobe no longer supports Flash Player. Adobe has blocked Flash content from running in Flash Player. We strongly recommend that you not implement SWF in motion graphic overlays. | July 5, 2022 | | [Updates to video quality information](video-quality.md) | The information in this section has been updated to incorporate information about the latest improvements to video quality. | June 6, 2022 | | [Performance expectations for appliances](appliance_performance.md) | The guide now includes information about performance expectations for Elemental Live appliances, including ways that you can measure and optimize it. | June 6, 2022 | | [Update to list of supported captions](captions-supported-formats.md) | This list has been revised to remove CFF captions. The CFF fomat hasn't been supported since Elemental Live removed support for the Ultraviolet output container. | May 27, 2022 | | [Inserting splice inserts on the day the clocks change](insert-a-new-splice-insert-message.md) | This section now includes information about using the REST API to insert a splice insert, specifically on the day that the clocks change to or from Standard Time. | May 27, 2022 | | [DTS Express audio codec](ref-license-codecs-audio.md) | Revised license requirements for this codec because decode isn't supported. | April 28, 2022 | | [Ultra-low latency](video-ull.md) | The user guide now includes information about the existing chunked transfer feature. This feature contributes to ultra-low latency in outputs. | February 11, 2022 | | [Interleave 4K inputs](interleave-2si-inputs.md) | This section (which was formerly called *Interleave 2SI inputs*) has been revised to include the relevant L8xx appliances that can support this input. | January 10, 2022 | | [Eligible messages in input sources](eligible-messages-and-streams.md) | There is an update to the section on the sources and input types that are supported for SCTE-35 and SCTE-104 messages. The table is now up to date with version 2.23.2. | January 7, 2022 | | [Dolby Atmos audio](dolby-atmos-output.md#dolby-atmos-output-sources) | This section has been revised to fix a mistake. The source can include up to 16 channels, not 8 channels, as previously specified. | January 7, 2022 | | [Add-on packages](ref-licenses.md) | The guide now includes information about add-on packages that you can purchase. | December 15, 2021 | | [Nielsen watermarks to ID3](feature-nielsen-id3.md) | Elemental Live now supports the ability to convert Nielsen watermarks to ID3 metadata. | December 6, 2021 | | [Nielsen watermark insertion](feature-nielsen-watermark.md) | The guide now includes information about inserting Nielsen watermarks into the output. | December 6, 2021 | | [Virtual input switching](feature-vips.md) | The guide includes information about virtual input switching using SCTE-35 messages (introduced in version 2.20.2) and virtual input switching through synchronous ESAM messages (introduced in version 2.23.0). | November 10, 2021 | | [Support for RTSP inputs](supported-inputs-live-types.md) | Starting with version 2.22.4, Elemental Live supports RTSP inputs. The guide now includes information about the uses of this input and about the supported video and audio codecs. | October 7, 2021 | | [Revision to codecs for supported outputs](ref-inputs-and-codecs.md) | The tables for supported input codecs have been revised to specify which input types support Dolby Digital Plus with Atmos. | October 7, 2021 | | [Revision to codecs for supported outputs](ref-file-inputs-and-codecs.md) | The tables for supported input codecs have been revised to specify which input types support Dolby Digital Plus with Atmos. | October 7, 2021 | | [Revision to codecs for supported outputs](ref-outputs-and-codecs.md) | The tables for supported output codecs have been revised to specify which output types support Dolby Digital Plus with Atmos. | October 7, 2021 | | [Enhanced support for Dolby Digital Plus with Atmos](dolby-atmos-output.md) | The guide includes information about audio output encoded with Dolby Digital Plus with Atmos. Previously, AWS Elemental Live supported this output only as passthrough. Starting with version 2.20.4, there is also support for converting an audio source to Dolby Digital Plus with Atmos. | October 7, 2021 | | [Improved support for Dolby Vision color space](color-space-convert-d.md) | Starting with AWS Elemental Live version 2.20.3, there is a new implementation of Dolby Vision color space. The color space section of the guide has been revised to include Dolby Vision. | October 5, 2021 | | [Color space](hdr-working-with.md) | The section on handling color space has been completely revised. | October 5, 2021 | | [Motion graphic using HTML5](how-to-insert-a-motion-overlay-with-html5.md) | The user guide now includes information about using an HTML5 asset in a motion graphic overlay. This feature was introduced in Elemental Live version 2.21.0. In addition, the existing information about the other methods for inserting motion graphic overlays has been redesigned, but there are no changes to the functionality. | September 23, 2021 | | [SMPTE 2110 SDP files](2110-sdp-about.md) | The guide has been updated to clarify that the source filter lines in SDP files are optional. | September 9, 2021 | | [Supported outputs](ref-outputs-and-codecs.md) | We have completely revised the information about types of output media and output codecs that Elemental Live supports. We have also moved the information to a section in the Outputs chapter. | August 18, 2021 | | [Supported inputs](ref-inputs-and-codecs.md) | We have completely revised the information about input types and input codecs that Elemental Live supports. We have also moved the information to a section in the Inputs chapter. | August 18, 2021 | | [Supported inputs](ref-file-inputs-and-codecs.md) | We have completely revised the information about input types and input codecs that Elemental Live supports. We have also moved the information to a section in the Inputs chapter. | August 18, 2021 | | [Delivering a TS using the SRT protocol](output-srt.md) | Starting with version 2.22.2, Elemental Live supports delivering a TS output using the SRT protocol. | August 11, 2021 | | [Working with SRT input](input-srt.md) | The guide now includes information about working with SRT inputs. | July 23, 2021 | | [Revision to SMPTE 2022-6 input section](input-2022-6.md) | The information about setting up a SMPTE 2022-6 input has been reorganized. | July 23, 2021 | | [Revisions to SCTE-35 section](scte-message-processing.md) | The SCTE-35 section has been revised to fix some errors. In particular, references to RTSP and HDS outputs have been removed because these output types are no longer supported. Also, screenshots have been removed. | July 19, 2021 | | [Trick-play in an HLS output group](trick-play-solutions.md) | Starting with version 2.22.1, Elemental Live supports inclusion of a trick-play track in an HLS output group. This track follows the Image Media Playlist specification, version 0.4. The guide has been updated to include this feature, and to include the existing feature for implementing trick-play using an I-frame only manifest. | July 7, 2021 | | [Ingesting SMPTE 2038](smpte-2038.md) | The section on ingesting SMPTE 2038 has been completely revised to better describe the behavior. In addition, new information about the passing through custom data has been added. | July 7, 2021 | | [Revision for bonded interfaces in SMPTE 2110 and SMPTE 2022-6](s2110-setup-bonded-if.md) | The user guide has been revised to clarify that if you implement redundant inputs (with SMPTE 2110 or SMPTE 2022-6) or redundant outputs (with SMPTE 2110), you can't have a bonded interface on the Mellanox card or the 25Gb card. | June 28, 2021 | | [WebVTT output captions using OCR](support-for-ocr.md) | Starting with version 2.22.0, Elemental Live supports the ability to produce WebVTT output captions by converting object-based source captions that are in DVB-Sub or SCTE-27 format. Elemental Live uses OCR (optical character recognition) to perform this conversion. The section on supported captions and the section on working with captions have been revised. | June 18, 2021 | | [Color space](hdr-working-with.md) | The section on handling color space has been completely revised. In addition, the section includes information for working with Dolby. | June 15, 2021 | | [SMPTE 2110](SMPTE-ST-2110.md) | The user guide now includes sections about the existing support for SMPTE 2110 inputs and SMPTE 2110 outputs. | June 5, 2021 | | [Version 2.25 release](what-is-aws-elemental-live.md) | First release of the 2.25 software version. | February 5, 2021 |