Video
[Section 6: Encoding Settings]

Video Encode Settings. More...

Modules
	Capture
	Video Capture Settings.
	Transcode
	Video Transcode Settings.
Variables
var	flixpub_flv_video_bitrate
	Video data rate [number].
var	flixpub_flv_video_rate_control_mode
	Video encode data rate control mode [number].
var	flixpub_flv_video_compression_mode
	Compression quality/speed [number].
var	flixpub_flv_video_keyframe_mode
	Keyframing mode [number].
var	flixpub_flv_video_keyframe_rate
	Keyframing rate [number].

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Detailed Description

The video encode settings are grouped into three sections. This section, which documents video settings that apply to all video encodes, and two sub-sections. One for video settings that apply only to Transcode, and the other for settings that apply only to Capture (recording).

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Variable Documentation

var flixpub_flv_video_bitrate

Data rate, in kilobits per second, of output FLV video. Higher numbers generally produce higher quality video.

var flixpub_flv_video_rate_control_mode

Controls how the video encoder behaves. Supported modes:

• kBitrateModeCBR: constant bit rate, best for streaming (default)
• kBitrateModeVBR: variable bit rate, best for progressive download and/or local playback.

var flixpub_flv_video_compression_mode

Controls quality and speed of video encoding. Faster encoding sacrifices some quality. Higher Quality encoding sacrifices speed.

Supported modes:

• kCompressModeRealTime: fastest/lowest quality
• kCompressModeGood is slower than realtime, but produces higher quality output.
• kCompressModeBest is slower than good, and should only be used for transcoding raw/lossless input.

Note:

For recording, values other than kCompressModeRealTime are ignored. Live sources must be encoded at real time speed.

var flixpub_flv_video_keyframe_mode

Controls how key frames are produced. Key frames are produced automatically based on decisions made by the video encoder library, or at a fixed interval.

Supported modes:

• kKeyframeModeAuto: lets the compression algorithm determine key frame placement. (default/optimal)
• kKeyframeModeConstFrequency: place key frames in the output at a fixed interval.

See also:

flixpub_flv_video_keyframe_rate

var flixpub_flv_video_keyframe_rate

The meaning of the flixpub_flv_video_keyframe_rate setting depends on the value of flixpub_flv_video_keyframe_mode.

Remarks:

When flixpub_flv_video_keyframe_mode is set to kKeyframeModeAuto, flixpub_flv_video_keyframe_rate is used as the maximum distance between key frames in the video stream.
When flixpub_flv_video_keyframe_mode is set to kKeyframeModeConstFrequency, flixpub_flv_video_keyframe_rate is used as a fixed interval.

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