AudioStream

A non-owning view of an audio stream within a Media. It wraps an AVStream + its codec parameters, owns no native memory, and holds a refcount on its parent Media so the file stays open while the view is alive.

Obtain one from Media::audioStream() or Media::streams(). Pass it to MediaEncoder::addAudio() to map it into an output.

Properties

All readonly.

Property	Type	Description
$index	int	Stream index within the container.
$codec	string	Codec short name, e.g. "aac".
$duration	float	Stream duration in seconds (0.0 if unknown).
$bitrate	int	Stream bit rate in bits/sec.
$sampleRate	int	Samples per second, e.g. 44100.
$channels	int	Number of audio channels.

Example

$a = FFmpeg\Media::open('clip.mp4')->audioStream();
if ($a !== null) {
    printf("%s %d Hz %d ch\n", $a->codec, $a->sampleRate, $a->channels);
}

See also

Media · VideoStream · MediaEncoder