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Add fps_conversion option for even-cadence frame-rate resampling #24

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eb712a0
Add fps_conversion option for even-cadence frame-rate resampling
RikHeijdens Oct 23, 2026
8b473ec
Validate frames locally before borrowing their planes as slices
RikHeijdens Oct 23, 2026
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10 changes: 10 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -113,6 +113,16 @@ request = MediaDecodeRequest(
streams = avtensor.decode_asset(request)
```

By default `fps` keeps the source frame nearest each output timestamp, which
spaces frames unevenly for non-integer ratios (30 -> 24 fps keeps 4 of every 5
frames). `fps_conversion="blend"` cross-fades neighbouring frames instead, and
`fps_conversion="motion"` interpolates along estimated motion (about 1.25x
the cost of the default):

```python
VideoStreamRequest(fps=24.0, fps_conversion="motion")
```

### Decode a time window (seek)

```python
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6 changes: 6 additions & 0 deletions avtensor.pyi
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Expand Up @@ -38,6 +38,11 @@ class VideoStreamRequest:
# "raw" when you need the actual HDR signal, e.g. training on PQ
# masters or colorimetric measurement.
hdr_mode: Literal["tonemap", "raw"] | None
# How `fps` resampling builds each output frame: "nearest" (default)
# keeps the nearest source frame (uneven spacing for e.g. 30 -> 24 fps);
# "blend" cross-fades neighbouring frames; "motion" interpolates along
# estimated block motion (about 1.2-1.6x the cost of "nearest").
fps_conversion: Literal["nearest", "blend", "motion"] | None

def __init__(
self,
Expand All @@ -52,6 +57,7 @@ class VideoStreamRequest:
device: str | None = None,
dtype: str | None = None,
hdr_mode: Literal["tonemap", "raw"] | None = None,
fps_conversion: Literal["nearest", "blend", "motion"] | None = None,
): ...

class LoudnessNormalization:
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