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libs: encoder: Describes more detail about the bitrate property

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https://bugzilla.gnome.org/show_bug.cgi?id=778732
This commit is contained in:
Hyunjun Ko 2017-06-02 13:50:05 +09:00 committed by Víctor Manuel Jáquez Leal
parent 81886682cd
commit cbd912b89b
1 changed files with 11 additions and 0 deletions
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11
gst-libs/gst/vaapi/gstvaapiencoder.c
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@ -136,6 +136,17 @@ gst_vaapi_encoder_properties_get_default (const GstVaapiEncoderClass * klass)
* GstVaapiEncoder:bitrate:
*
* The desired bitrate, expressed in kbps.
* This is available when rate-control is CBR or VBR.
*
* CBR: This applies equally to minimum, maximum and target bitrate in the driver.
* VBR: This applies to maximum bitrate in the driver.
* Minimum bitrate will be calculated like the following in the driver.
* if (target percentage < 50) minimum bitrate = 0
* else minimum bitrate = maximum bitrate * (2 * target percentage -100) / 100
* Target bitrate will be calculated like the following in the driver.
* target bitrate = maximum bitrate * target percentage / 100
*
* Note that target percentage is set as 70 currently in GStreamer VA-API.
*/
GST_VAAPI_ENCODER_PROPERTIES_APPEND (props,
GST_VAAPI_ENCODER_PROP_BITRATE,