OBS Studio 29.1 highlights include support for streaming AV1/HEVC for YouTube via RTMP, support for AJA capture card surround sound, new lossless audio recording options for FLAC, ALAC and PCM (including 32-bit float), and support for multiple tracks in simple output recordings.

Developer Alert Enhanced RTMP V1 extends the RTMP protocol to support newer video codecs and HDR that have not yet been implemented; in addition, AV1 / HEVC streaming over RTMP is currently only supported and enabled as a Beta feature for YouTube.

For Linux users, OBS Studio 29.1 significantly improves screen capture performance on devices with dedicated Intel GPUs, updates the JACK input to show “OBS Studio” in its name to clarify its origin, and improves virtual camera support and V4L2 sources.

OBS Studio 29.1 also brings new settings for recording in segmented MP4 and MOV video formats, new settings for selecting audio encoders for streaming and recording, and new options for preloading media sources used in Stingers into memory.

In addition, OBS Studio 29.1 adds indicators to see when an audio source is unmuted and not assigned to any track, as well as the ability to zoom in and out of browser docks using Ctrl – and + or right-click context menus.

This release expands support for subtitle tracks in VLC sources to up to 1000, adds HEVC and HDR support for VA-API encoders, adds HDR capture support for DeckLink sources, improves YouTube thumbnail previews, and introduces QVBR support for AMF encoders.

The list of improvements also includes symbolic linking support for VST paths, twoloop as the default FFmpeg AAC encoder, CUDA support for hardware decoding of media sources, better DeckLink performance, Python 3.11 support for scripts, and FDK AAC support on Flatpak.

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Image source Philips

Vulkan Video API 1.0 mainly focuses on H.264 and H.265 / HEVC. Vulkan working group members say they are working on VP9/AV1 extensions, but it doesn’t appear to be a priority.

AMD’s Ahmed Abdelkhalek said in a comment: “VP9 decode and AV1 decode/encode are already on our list for 2023. The related core extensions are almost complete and support should be released much sooner. We apologize again for the delay” .

VP9 is a free, open-source image encoding format developed by Google to replace the old VP8 image encoding format and compete with the high-efficiency video encoding dominated by the Dynamic Expert Image Group. VP9 is mainly used in Google’s famous video sharing website YouTube. VP9 is typically packaged in WebM format along with Opus audio encoding.

AOMedia Video 1 (AV1) is an open, patent-free video encoding format designed for streaming over the Internet. It was developed by the Alliance for Open Media, which was formed in 2015 by semiconductor companies, video-on-demand providers and web browser developers, to replace its predecessor, VP9.

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Previously, Intel Arc Alchemist graphics cards had been the first to provide support for AV1 encoding, but repeated delays in sales meant that it would lose this first-mover advantage.

Now, the Chromium development team has approved another merge request to enable AV1 encoding on NVIDIA GPUs.

This means that a wide range of users will be able to experience this new feature on upcoming versions of Chromium kernel browsers such as Google Chrome and Microsoft Edge.

It is reported that the 8th generation NVENC of the RTX 40 graphics card provides dual AV1 encoder support, and the official promise is to be able to record games at 8K60 quality and nearly twice the export speed.

Thanks to this, the quality of streaming will also be improved – because the efficiency of the AV1 codec is more efficient than H.264 (AVC) and VP9.

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