software-mansion/smelter
Dec 2024 – Jun 2026
19 Months active
Languages Used
RustTypeScriptBashCSSJSONC++CGStreamer
Technical Skills
API DevelopmentBackend DevelopmentMedia StreamingNetworkingRustWebRTC
Wojciech Kaźmierczak
PROFILE
Wojciech Kaźmierczak
Over 19 months, contributed to the software-mansion/smelter repository by building and refining a robust media streaming platform focused on real-time video and audio workflows. Developed end-to-end RTMP, WebRTC, and WHIP/WHEP protocol support, implementing features such as codec negotiation, hardware-accelerated encoding, and secure TLS streaming. Leveraged Rust and TypeScript to deliver modular APIs, extensible server architectures, and cross-platform SDKs, while maintaining strong test coverage and CI reliability. Enhanced system configurability, observability, and interoperability through careful refactoring, explicit configuration options, and protocol-aligned API surfaces, resulting in a maintainable codebase that supports scalable, low-latency streaming and rapid feature delivery.
Overall Statistics
Feature vs Bugs
90%Features
Repository Contributions
129Total
Bugs
5
Commits
129
Features
47
Lines of code
42,673
Activity Months19
Your Network
69 peopleSame Organization
@swmansion.com61
Work History
June 2026
2 Commits • 1 Features
Jun 1, 2026June 2026: Focused RTMP streaming core improvements for software-mansion/smelter, delivering clearer configuration and better maintainability. The work emphasizes business value through enhanced configurability, stability, and future extensibility, with traceable commits aligned to internal issue numbers.
2 Commits • 1 Features
Jun 1, 2026June 2026: Focused RTMP streaming core improvements for software-mansion/smelter, delivering clearer configuration and better maintainability. The work emphasizes business value through enhanced configurability, stability, and future extensibility, with traceable commits aligned to internal issue numbers.
June 2026
May 2026
10 Commits • 3 Features
May 1, 2026May 2026 — Monthly summary for software-mansion/smelter. Delivered major RTMP streaming enhancements across audio, encoding, and messaging layers, plus a targeted refactor to improve maintainability and extensibility. The work focused on delivering immediate business value through improved reliability, broader codec support, and cleaner architecture for streaming workloads.
May 2026
10 Commits • 3 Features
May 1, 2026May 2026 — Monthly summary for software-mansion/smelter. Delivered major RTMP streaming enhancements across audio, encoding, and messaging layers, plus a targeted refactor to improve maintainability and extensibility. The work focused on delivering immediate business value through improved reliability, broader codec support, and cleaner architecture for streaming workloads.
April 2026
9 Commits • 3 Features
Apr 1, 2026April 2026 monthly summary: Delivered robust streaming transport enhancements across WebRTC and RTMP, plus tooling improvements. WebRTC: expanded H264 profile-level support with hardware-capable filtering; improved WHIP/WHEP error handling; clarified SDP negotiation documentation. RTMP/E-RTMP: added tcUrl to connect messages; strengthened E-RTMP support with improved video/audio handling; refined command handling (support for @ prefixes) and RtmpEvent refactor; enhanced audio parsing for E-RTMP. Tooling/Performance/UX: updated Rust to 1.95.0; improved autocompletion sorting; optimized audio/video queues; refined layout rendering conditions. Impact: broader device interoperability, reduced streaming failures, more predictable deployments, and a cleaner codebase enabling faster future work.
9 Commits • 3 Features
Apr 1, 2026April 2026 monthly summary: Delivered robust streaming transport enhancements across WebRTC and RTMP, plus tooling improvements. WebRTC: expanded H264 profile-level support with hardware-capable filtering; improved WHIP/WHEP error handling; clarified SDP negotiation documentation. RTMP/E-RTMP: added tcUrl to connect messages; strengthened E-RTMP support with improved video/audio handling; refined command handling (support for @ prefixes) and RtmpEvent refactor; enhanced audio parsing for E-RTMP. Tooling/Performance/UX: updated Rust to 1.95.0; improved autocompletion sorting; optimized audio/video queues; refined layout rendering conditions. Impact: broader device interoperability, reduced streaming failures, more predictable deployments, and a cleaner codebase enabling faster future work.
April 2026
March 2026
7 Commits • 2 Features
Mar 1, 2026March 2026 monthly summary for software-mansion/smelter focusing on security-enabling streaming protocols, reliability fixes, and interoperability improvements. Delivered TLS-secured RTMP/RTMPS with unified TLS config, enhanced RTMP video parsing/serialization for E-RTMP, hardened WebRTC SDP negotiation with H264 fmtp filtering, and fixed WHEPInput peer connection handling.
March 2026
7 Commits • 2 Features
Mar 1, 2026March 2026 monthly summary for software-mansion/smelter focusing on security-enabling streaming protocols, reliability fixes, and interoperability improvements. Delivered TLS-secured RTMP/RTMPS with unified TLS config, enhanced RTMP video parsing/serialization for E-RTMP, hardened WebRTC SDP negotiation with H264 fmtp filtering, and fixed WHEPInput peer connection handling.
February 2026
4 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for software-mansion/smelter. Delivered end-to-end RTMP input handling and streaming capabilities with API enhancements for RTMP configuration, alongside robust spam-prevention safeguards for RTMP workflows. Implemented state-machine-based controls and improved decoder warnings to increase reliability and security during live input processing. Aligned RTMP input API with ts-sdk to streamline integration and reduce onboarding friction.
4 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for software-mansion/smelter. Delivered end-to-end RTMP input handling and streaming capabilities with API enhancements for RTMP configuration, alongside robust spam-prevention safeguards for RTMP workflows. Implemented state-machine-based controls and improved decoder warnings to increase reliability and security during live input processing. Aligned RTMP input API with ts-sdk to streamline integration and reduce onboarding friction.
February 2026
January 2026
5 Commits • 1 Features
Jan 1, 2026January 2026 monthly summary for software development focused on enabling robust RTMP streaming ingestion in the Smelter service. Delivered the RTMP Streaming Core with an FFmpeg-based input path, along with server lifecycle integration and data contracts that empower downstream processing and pipeline orchestration.
January 2026
5 Commits • 1 Features
Jan 1, 2026January 2026 monthly summary for software development focused on enabling robust RTMP streaming ingestion in the Smelter service. Delivered the RTMP Streaming Core with an FFmpeg-based input path, along with server lifecycle integration and data contracts that empower downstream processing and pipeline orchestration.
December 2025
1 Commits • 1 Features
Dec 1, 2025December 2025 monthly summary for software-mansion/smelter: Delivered the Base RTMP Streaming Server Foundation with handshake, connection handling, and stream management. Configurable port and support for multiple concurrent connections establish a foundation for additional streaming features and protocols. Commit e8223f0b645c65ddded00cd081c85c483f604bc6 ([rtmp] Base server implementation (#1588)). Impact: provides a scalable, reusable core for real-time streaming, enabling faster feature delivery and improved multi-client support. Technologies/skills demonstrated: RTMP protocol basics, network/server architecture, concurrency, port configurability, and modular server design.
1 Commits • 1 Features
Dec 1, 2025December 2025 monthly summary for software-mansion/smelter: Delivered the Base RTMP Streaming Server Foundation with handshake, connection handling, and stream management. Configurable port and support for multiple concurrent connections establish a foundation for additional streaming features and protocols. Commit e8223f0b645c65ddded00cd081c85c483f604bc6 ([rtmp] Base server implementation (#1588)). Impact: provides a scalable, reusable core for real-time streaming, enabling faster feature delivery and improved multi-client support. Technologies/skills demonstrated: RTMP protocol basics, network/server architecture, concurrency, port configurability, and modular server design.
December 2025
November 2025
7 Commits • 4 Features
Nov 1, 2025November 2025: Delivered end-to-end RTMP server input support and Smelter SDK integration, refined WebRTC/WHIP codec negotiation with Opus audio channel options, added forced audio resampling, enforced RTP payload-type compliance in WHEP, and refreshed video output API typings. These changes broaden ingestion capabilities, boost streaming reliability and audio quality, and improve developer productivity through stronger type safety and clearer APIs.
November 2025
7 Commits • 4 Features
Nov 1, 2025November 2025: Delivered end-to-end RTMP server input support and Smelter SDK integration, refined WebRTC/WHIP codec negotiation with Opus audio channel options, added forced audio resampling, enforced RTP payload-type compliance in WHEP, and refreshed video output API typings. These changes broaden ingestion capabilities, boost streaming reliability and audio quality, and improve developer productivity through stronger type safety and clearer APIs.
October 2025
19 Commits • 4 Features
Oct 1, 2025Month: 2025-10 — Summary of work for software-mansion/smelter focusing on feature delivery, reliability, and developer experience. Delivered a cohesive WebRTC input/output overhaul with WHEP/WHIP enhancements, introduced Vulkan-accelerated encoding across multiple outputs, and modernized HTTP/WHEP/WHIP interaction layers. Improved API ergonomics by enabling Copy semantics for core API types and applied targeted bug fixes to stabilize the integration for downstream usage.
19 Commits • 4 Features
Oct 1, 2025Month: 2025-10 — Summary of work for software-mansion/smelter focusing on feature delivery, reliability, and developer experience. Delivered a cohesive WebRTC input/output overhaul with WHEP/WHIP enhancements, introduced Vulkan-accelerated encoding across multiple outputs, and modernized HTTP/WHEP/WHIP interaction layers. Improved API ergonomics by enabling Copy semantics for core API types and applied targeted bug fixes to stabilize the integration for downstream usage.
October 2025
September 2025
17 Commits • 4 Features
Sep 1, 2025September 2025: Focused on reliability, performance, and developer ergonomics for Smelter. Delivered WebRTC/WHEP/WHIP stability and lifecycle enhancements, enabling robust termination/cleanup, improved RTP/RTCP handling, and FEC support while maintaining compatibility with webrtc-rs 0.13.0. Introduced explicit decoder selection for MP4/HLS inputs (FFmpeg vs Vulkan) with clearer options, dynamic preference logic, and API refactors. Strengthened API stability and usability (per-output ComponentId uniqueness, extended audio volume range, and TypeScript decoder option typings). Upgraded core dependencies (ffmpeg-next 8.0.0 and webrtc-rs 0.13.0) to boost performance and reliability. These changes reduce resource leaks, prevent runtime edge cases, and improve startup resilience, delivering tangible business value through higher uptime and broader input support.
September 2025
17 Commits • 4 Features
Sep 1, 2025September 2025: Focused on reliability, performance, and developer ergonomics for Smelter. Delivered WebRTC/WHEP/WHIP stability and lifecycle enhancements, enabling robust termination/cleanup, improved RTP/RTCP handling, and FEC support while maintaining compatibility with webrtc-rs 0.13.0. Introduced explicit decoder selection for MP4/HLS inputs (FFmpeg vs Vulkan) with clearer options, dynamic preference logic, and API refactors. Strengthened API stability and usability (per-output ComponentId uniqueness, extended audio volume range, and TypeScript decoder option typings). Upgraded core dependencies (ffmpeg-next 8.0.0 and webrtc-rs 0.13.0) to boost performance and reliability. These changes reduce resource leaks, prevent runtime edge cases, and improve startup resilience, delivering tangible business value through higher uptime and broader input support.
August 2025
10 Commits • 2 Features
Aug 1, 2025Monthly summary for 2025-08 (software-mansion/smelter): Delivered WebRTC egress enhancements via WHEP/WHIP with new output modules, definitions, and conversion logic, including Trickle ICE support. Refactored WHIP/WHEP input sessions, improved routing and endpoint naming, and enhanced payloader lifecycle and authentication handling (bearerToken optional). Implemented route/inputs/outputs renames to align with protocol terminology, reducing integration friction. UI SDK gained BoxShadow typing and a mapping utility, with Rescaler and View updated to support boxShadow styling. Overall, these changes improve delivery flexibility, reliability, and developer experience for downstream clients, while strengthening production readiness through clearer API surfaces and token/session handling improvements.
10 Commits • 2 Features
Aug 1, 2025Monthly summary for 2025-08 (software-mansion/smelter): Delivered WebRTC egress enhancements via WHEP/WHIP with new output modules, definitions, and conversion logic, including Trickle ICE support. Refactored WHIP/WHEP input sessions, improved routing and endpoint naming, and enhanced payloader lifecycle and authentication handling (bearerToken optional). Implemented route/inputs/outputs renames to align with protocol terminology, reducing integration friction. UI SDK gained BoxShadow typing and a mapping utility, with Rescaler and View updated to support boxShadow styling. Overall, these changes improve delivery flexibility, reliability, and developer experience for downstream clients, while strengthening production readiness through clearer API surfaces and token/session handling improvements.
August 2025
July 2025
5 Commits • 4 Features
Jul 1, 2025July 2025 focused on delivering core features for rendering fidelity, observability, streaming capabilities, and tooling modernization across the Smelter repository. The work improved UI stability for images, enhanced system visibility, enabled streaming support, and updated the Rust toolchain for future-proofing.
July 2025
5 Commits • 4 Features
Jul 1, 2025July 2025 focused on delivering core features for rendering fidelity, observability, streaming capabilities, and tooling modernization across the Smelter repository. The work improved UI stability for images, enhanced system visibility, enabled streaming support, and updated the Rust toolchain for future-proofing.
June 2025
5 Commits • 3 Features
Jun 1, 2025June 2025 performance summary for software-mansion/smelter. Delivered extended media format support (YUV422P/YUV444P) across decoding, encoding, and output, introduced automatic image format detection for assets, and stabilized integration tests by migrating to snapshot assets and standardizing ffmpeg to 720p. These efforts broaden platform compatibility, reduce manual work for asset handling, and improve CI reliability, enabling faster onboarding and more robust media pipelines.
5 Commits • 3 Features
Jun 1, 2025June 2025 performance summary for software-mansion/smelter. Delivered extended media format support (YUV422P/YUV444P) across decoding, encoding, and output, introduced automatic image format detection for assets, and stabilized integration tests by migrating to snapshot assets and standardizing ffmpeg to 720p. These efforts broaden platform compatibility, reduce manual work for asset handling, and improve CI reliability, enabling faster onboarding and more robust media pipelines.
June 2025
May 2025
10 Commits • 3 Features
May 1, 2025May 2025: Delivered major codec and testing improvements for the software-mansion/smelter project, expanding cross-protocol codec support, refining WHIP negotiation, and strengthening test reliability to accelerate stable releases. Resulting value includes broader VP8/VP9 interoperability across MP4/RTMP/RTP/WHIP, improved API ergonomics with encoder/decoder preferences, and faster, more reliable integration tests with updated FFmpeg usage.
May 2025
10 Commits • 3 Features
May 1, 2025May 2025: Delivered major codec and testing improvements for the software-mansion/smelter project, expanding cross-protocol codec support, refining WHIP negotiation, and strengthening test reliability to accelerate stable releases. Resulting value includes broader VP8/VP9 interoperability across MP4/RTMP/RTP/WHIP, improved API ergonomics with encoder/decoder preferences, and faster, more reliable integration tests with updated FFmpeg usage.
April 2025
8 Commits • 5 Features
Apr 1, 2025April 2025 summary: Expanded codec capabilities and unified output configuration to improve reliability and time-to-market. Key outcomes include stronger test coverage for H.264/VP8 integration, VP8 encoding and RTP output support, VP9 decoding for RTP/WHIP, centralized encoder/output configuration with codec negotiation, and CI stability improvements by pinning the Rust toolchain to 1.86.0 across workflows. Result: broader codec support, more predictable builds, and a simpler, more reliable deployment path for outputs across RTP/RTMP/MP4/WHIP.
8 Commits • 5 Features
Apr 1, 2025April 2025 summary: Expanded codec capabilities and unified output configuration to improve reliability and time-to-market. Key outcomes include stronger test coverage for H.264/VP8 integration, VP8 encoding and RTP output support, VP9 decoding for RTP/WHIP, centralized encoder/output configuration with codec negotiation, and CI stability improvements by pinning the Rust toolchain to 1.86.0 across workflows. Result: broader codec support, more predictable builds, and a simpler, more reliable deployment path for outputs across RTP/RTMP/MP4/WHIP.
April 2025
March 2025
3 Commits • 2 Features
Mar 1, 2025March 2025 monthly summary for software-mansion/smelter. Delivered key features expanding device and network compatibility, automated negotiation for streamlined workflows, and robustness improvements in the video decoding path. These changes drive faster time-to-value for customers and reduce operational risk in production deployments.
March 2025
3 Commits • 2 Features
Mar 1, 2025March 2025 monthly summary for software-mansion/smelter. Delivered key features expanding device and network compatibility, automated negotiation for streamlined workflows, and robustness improvements in the video decoding path. These changes drive faster time-to-value for customers and reduce operational risk in production deployments.
February 2025
3 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for software-mansion/smelter. Delivered a Next.js-based demo that enables in-browser rendering of Smelter outputs on an HTML canvas, including a complete Next.js and Tailwind CSS configuration and sample components for camera and screen-share inputs, with visuals aligned to the latest website design. Additionally, removed the border_radius field from the Tiles API in both Rust and TypeScript definitions to simplify the component and ensure consistency across API surfaces. These efforts establish an end-to-end demo path, improve maintainability, and support faster stakeholder demonstrations.
3 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for software-mansion/smelter. Delivered a Next.js-based demo that enables in-browser rendering of Smelter outputs on an HTML canvas, including a complete Next.js and Tailwind CSS configuration and sample components for camera and screen-share inputs, with visuals aligned to the latest website design. Additionally, removed the border_radius field from the Tiles API in both Rust and TypeScript definitions to simplify the component and ensure consistency across API surfaces. These efforts establish an end-to-end demo path, improve maintainability, and support faster stakeholder demonstrations.
February 2025
January 2025
3 Commits • 2 Features
Jan 1, 2025January 2025: Delivered two strategic capabilities for software-mansion/smelter that enhance text rendering customization and live media ingestion. Implemented Dynamic Font Registration and Loading with a dedicated register_font endpoint and Node.js SDK support, and integrated WHIP server capability to ingest and integrate media streams into the LiveCompositor pipeline. These enhancements expand input modalities, enable dynamic font workflows, and lay groundwork for richer multimedia rendering in production environments.
January 2025
3 Commits • 2 Features
Jan 1, 2025January 2025: Delivered two strategic capabilities for software-mansion/smelter that enhance text rendering customization and live media ingestion. Implemented Dynamic Font Registration and Loading with a dedicated register_font endpoint and Node.js SDK support, and integrated WHIP server capability to ingest and integrate media streams into the LiveCompositor pipeline. These enhancements expand input modalities, enable dynamic font workflows, and lay groundwork for richer multimedia rendering in production environments.
December 2024
1 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for software-mansion/smelter: Focused on expanding live streaming capabilities by delivering WHIP Output Support for LiveCompositor, enabling sending media streams to WHIP-compatible servers with configurable encoding options and WebRTC-based connection handling. This work broadens server interoperability and supports scalable, low-latency streaming workflows.
1 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for software-mansion/smelter: Focused on expanding live streaming capabilities by delivering WHIP Output Support for LiveCompositor, enabling sending media streams to WHIP-compatible servers with configurable encoding options and WebRTC-based connection handling. This work broadens server interoperability and supports scalable, low-latency streaming workflows.
December 2024
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Quality Metrics
Correctness90.2%
Maintainability87.0%
Architecture88.2%
Performance82.6%
AI Usage23.0%
Skills & Technologies
Programming Languages
BashCC++CSSGStreamerJSONJavaScriptMarkdownRustTOML
Technical Skills
API DesignAPI DevelopmentAPI IntegrationAPI RefactoringAPI developmentAsynchronous ProgrammingAudio EncodingAudio ProcessingAudio StreamingBackend DevelopmentC++CI/CDCode OrganizationCode RefactoringCodec Integration
Repositories Contributed To
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