Google Flix Engine Linux Reference Manual Instrukcja Użytkownika Pobierz pdf (Strona 270)

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264 Flix Engine Linux Module Documentation

5.56.2.17 on2sc video_options_SetKeyframeIntervalType (FLIX2HANDLE ﬂix, const

FE2_VideoKeyframeTypes keyframeIntervalType)

Set the keyframe interval type.

Two keyframe modes are supported, MAX_KEYFRAMES (the default) and FIXED_KEYFRAMES.

These specify that the keyframe interval set using video_options_SetKeyframeInterval() is either the max-

imum interval between keyframes or a ﬁxed interval, respectively. In general, the compression codec does

the best job of deciding when keyframes should be used, so setting the maximum interval is usually more

appropriate.

Parameters:

← ﬂix Handle to the Flix Engine returned from Flix2_Create() or Flix2_CreateEx()

← keyframeIntervalType Keyframe interval type (one of FE2_VideoKeyframeTypes)

Return values:

ON2_OK The keyframe interval was successfully set in the engine.

ON2_INVALID_PARAMS The value is out of range.

ON2_NET_ERROR The underlying communication layer failed.

Note:

The default value is MAX_KEYFRAMES

Deprecated

Use the Codec Interface along with the FE2_VCODECPARAM_KFINTTYPE parameter. This func-

tion will be removed in a future release. See also: Video Codecs.

5.56.2.18 on2sc video_options_SetMaximumBitrate (FLIX2HANDLE ﬂix, const int32_t

lMaximumBitrate)

Set the maximum bitrate target.

Sets the bitrate the compressor will target when encoding the video.

Parameters:

← ﬂix Handle to the Flix Engine returned from Flix2_Create() or Flix2_CreateEx()

← lMaximumBitrate Bitrate target (in Kbps)

Return values:

ON2_OK The target bitrate was successfully set in the engine.

ON2_INVALID_PARAMS The value is out of range.

ON2_NET_ERROR The underlying communication layer failed.

Note:

This bitrate should be a reasonable number with respect to the other video parameters. To determine

if a particular value is reasonable or not, ﬁrst calculate the number of bits per pixel it represents, given

the bitrate in Kbps, framerate in frames per second, and width and height in pixels, using this equation:

bpp =

bitrate ∗ 1024

width ∗ height ∗ framerate

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