feat: add video input support and related functionality for multimodal models#103
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netdur
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May 28, 2026
Video support, done the way libmtmd actually allows: a "video" is a
sequence of image frames. libmtmd has no video decoder (only stb_image
for stills and miniaudio for audio), so frame extraction is the
caller's job — LlamaMedia.videoFrames(frames) wraps pre-extracted frame
bytes as one image media item each, to pair with one marker per frame
(EngineChat.addUser inserts the markers automatically).
example/probes/video_describe.dart shows the full flow: ffmpeg extracts
N downscaled frames, videoFrames wraps them, and they go through the
normal multimodal chat path. Verified against
SmolVLM2-256M-Video-Instruct on a real clip — it produces a coherent
description ("A woman is taking a selfie in a store...").
This is the correct alternative to PR #103, whose premise (libmtmd
auto-decodes video) does not hold: routing raw mp4 bytes through the
image path returns null. No MediaKind.video, no dead video-token params.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Done by Claude Haiku from GitHub Colilot.
I am testing whether it works. Hopefully I will open it when I am sure it is correct.