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CasparCG Server

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Velocity0.0

Professional broadcast graphics and video playout server

casparcg.com ↗

CasparCG 2.5.1 drops the AVX2 floor it set in 2.5.0 and moves to FFmpeg 8.1.

broadcastplayoutffmpegdecklinkaudiolinux-support
◆Current state
CasparCG Server is an open-source broadcast playout server shipping one or two stable releases a year. 2.5.1 (September 16) removes the AVX2 requirement except for v210 Decklink output, updates FFmpeg to 8.1.2, and adds multi-device audio output, configurable audio and screen delays and an option to disable Decklink keying. 2.5.0 in December 2025 brought initial HDR, headless Linux and Ubuntu packaging.
◆Where it's heading
After 2.5.0 set new baselines, 2.5.1 walks back the hardware one and spends the rest on stability: FFmpeg error handling, an AMCP BATCH race and Decklink av-sync recovery. The pattern is a feature-heavy .0 followed by fix-heavy point releases.
◆Prediction
Expect further 2.5.x point releases before any 2.6 work appears; the entries show no 2.6 betas yet.

◆Recent moves

  1. 1mo ago

    2.5.1 drops the AVX2 requirement and updates FFmpeg to 8.1.2

    The point release reverses 2.5.0's hardware floor for most uses and adds multi-device audio and configurable delays. Most of the rest is stability work on FFmpeg, AMCP and Decklink paths.

    View source ↗
  2. 11mo ago

    2.5.0 brings initial HDR, headless Linux and an AVX2 baseline

    ⚡ SPARK

    The release that moves CasparCG's colour pipeline forward: initial HDR support, more ffmpeg pixel formats to preserve colour accuracy, reworked mixer transforms, and ffmpeg 7.0. It also changes where the server can run — headless Linux, Ubuntu debs, VS2022 Windows builds — and announces AVX2 as a hard requirement from 2.6.

    View source ↗
  3. 1y ago

    2.4.3 clears crashes across FFmpeg, Decklink and HTML producers

    A fix-only release covering the paths that actually take a channel off air: an FFmpeg crash on invalid frame headers, a Decklink crash with ffmpeg 7, an HTML producer crash on exit, and cross-channel progressive-to-interlaced routes rendering mostly black. Stabilization work ahead of the 2.5 colour rework.

    View source ↗
  4. 1y ago

    2.4.2 restores Decklink driver 14.3 compatibility

    A single-item release fixing support for Blackmagic Decklink driver 14.3 and later. Necessary for anyone on current drivers, but narrow.

    View source ↗
  5. 2y ago

    2.4.1 fixes Decklink subregions, EXIF rotation and NDI source listing

    A broad correction pass: three Decklink subregion bugs affecting frame height and vertical offset, EXIF rotate flags now respected on images, NDI local source listing, and a reverted tbbmalloc removal that had cost noticeable Windows performance. Consolidation immediately after the 2.4.0 major.

    View source ↗
  6. 2y ago

    2.4.0 adds 8K and 4K DCI frames plus AMCP command batching

    The 2.4 major: 8K and 4K DCI frame support, configurable custom resolutions, an interlaced mixer pipeline for field accuracy, 16-channel audio, and a meaningfully expanded AMCP surface including command batching, CLEAR ALL, CALLBG and CLEAR_ON_404. It also drops the undocumented CII and CLK protocols.

    View source ↗