Integrate a native Jetson Multimedia API encoder path and keep the existing encoded access-unit contract for RTMP, RTP, and recording consumers.
This adds conditional Jetson MMAPI detection in CMake, builds the required NVIDIA sample common classes into a dedicated support library, and compiles the new backend only when the platform dependencies are present.
The runtime selector now lets encoder.backend=auto prefer Jetson MM for NVIDIA hardware requests while keeping encoder.backend=ffmpeg as an explicit FFmpeg path. Device selection semantics are updated so nvidia requires the Jetson backend, auto can fall back to FFmpeg software, and software remains FFmpeg-only.
The Jetson backend converts supported raw inputs through swscale, feeds NvVideoEncoder in YUV420M, emits Annex-B access units, and harvests decoder configuration from a warmup keyframe so downstream packetizers keep their existing contract.
This also splits FFmpeg encoder option handling into a shared header, updates runtime config/help text and tester defaults, and refreshes compatibility/caveat documentation to reflect the new selection behavior.
Build-tree runtime RPATH handling is tightened so GCC 15 builds keep the matching libstdc++ visible locally. Verification covered GCC 15 builds, RTP H.264/H.265 tester runs, RTMP H.264 stub publish, local live SRS smoke with cvmmap://zed1, and remote execution on 192.168.2.155 using the deployed bundle lib directory for the GCC 15 runtime.
This commit consolidates operational documentation and runbooks used to drive task execution and release validation.
It includes evidence writeups, caveat/matrix references, release gate outputs, plan/notepad context, and generated SDP fixture needed for reproducible downstream review, keeping them separate from code and generated artifacts.
This separation lets runtime and harness changes be reviewed as implementation units while process documentation remains in an independent governance/history commit.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
crosstyan