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Document video frame rate and frame limit for LFM3-VL-2B and LFM3-Omni-2B - #161
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mlabonne
previously approved these changes
Nov 2, 2026
s-jse
reviewed
Nov 2, 2026
| ## Video Frame Rate and Frame Limit | ||
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| By default, LFM3-Omni-2B samples video at 2 fps, with at least 4 and at most 384 frames per video. Both are configurable: each frame adds vision tokens, so a lower frame rate or frame limit uses less context and memory and lowers latency, while a higher one preserves more detail. Set them according to your latency and quality requirements. These settings do not change the soundtrack: the model always hears all of it. | ||
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"soundtrack" -> "audio track"
Soundtrack brings movie music to mind.
| - **Transformers:** set the frame rate per call with `processor.apply_chat_template(..., processor_kwargs={"fps": 1})`. Set the frame limit when you load the processor: `AutoProcessor.from_pretrained(model_id, trust_remote_code=True, max_frames=128)`. | ||
| - **vLLM:** set a server default in `--media-io-kwargs`, for example `'{"video": {"video_backend": "qwen3_vl", "fps": 1, "max_frames": 128}}'`. Override it per request with `extra_body={"media_io_kwargs": {"video": {"fps": 1, "max_frames": 128}}}`. | ||
| - **SGLang:** change `fps`, `min_frames`, and `max_frames` under `video_processor` in `processor_config.json` in a local copy of the checkpoint. | ||
| - **llama.cpp:** always uses 2 fps and 4 to 768 frames for this model. `--video-fps` has no effect. |
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Would editing the model config file make this possible for llama.cpp?
s-jse
approved these changes
Nov 10, 2026
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Summary
lfm/models/lfm3-vl-2b.mdx: adds a "Frame Rate and Frame Limit" subsection under "Video Input" with defaults (2 fps, 4–768 frames) and settings for Transformers, vLLM, SGLang, and llama.cpp.lfm/models/lfm3-omni-2b.mdx: adds a "Video Frame Rate and Frame Limit" section at the end with defaults (2 fps, 4–384 frames) and settings for Transformers, SGLang, and llama.cpp. Notes that these settings don't affect the soundtrack.🤖 Generated with Claude Code