Nullsrc
Video Single output Source
Null video source, return unprocessed video frames.
FFmpeg filter:
nullsrc— the official reference.
Generate a stream. Nullsrc is a source — it has no input, so you create a stream from it rather than applying it to one:
$video = \FFmpeg\VideoStream::generate(new Nullsrc(…));apply() and addFilter() do not apply to source filters (there is nothing to attach them to).
When to use it
Section titled “When to use it”TODO — when this filter shines: what it’s the right tool for, what to reach for instead when it isn’t, and how it composes with neighbouring filters.
How to use it
Section titled “How to use it”TODO — prose: how the filter actually works and what its key parameters mean (the explanation FFmpeg’s terse option help omits).
Examples
Section titled “Examples”TODO — runnable PHP, with the equivalent ffmpeg CLI alongside.
Gotchas
Section titled “Gotchas”TODO
See also
Section titled “See also”TODO
Parameters
Section titled “Parameters”| Parameter | Type | Default | Range / values | Description |
|---|---|---|---|---|
size | string | 320x240 | — | set video size |
rate | string | 25 | — | set video rate |
duration | int | -1 | ≥ -1 | set video duration |
sar | string | — | — | set video sample aspect ratio |
FFmpeg also names these options (use the parameter shown above): s → size, r → rate, d → duration.
Maps to FFmpeg’s nullsrc filter. Verified against ffmpeg n7.1.1.
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