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vp9: Reset buffer level on large bitrate changes.

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For a large change in the target avg_frame_bandwidth,
via the update in change_config()), reset the buffer_level
to optimal_level.

This fix prevents possible frame drops, where for example,
encoder suddenly goes from lower to higher bitrate.

Change-Id: I2f844c41d04c01240e85f574e59d2b9075c7eb6d
This commit is contained in:
Marco 2017-12-07 17:24:41 -08:00
parent 08a668af32
commit a2127236ae
2 changed files with 5 additions and 0 deletions
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3
vp9/encoder/vp9_encoder.c
View File

@ -1868,6 +1868,7 @@ void vp9_change_config(struct VP9_COMP *cpi, const VP9EncoderConfig *oxcf) {
// Check for resetting the rc flags (rc_1_frame, rc_2_frame) if the
// configuration change has a large change in avg_frame_bandwidth.
// For SVC check for resetting based on spatial layer average bandwidth.
// Also reset buffer level to optimal level.
if (cm->current_video_frame > 0) {
if (cpi->use_svc) {
vp9_svc_check_reset_layer_rc_flag(cpi);
@ -1876,6 +1877,8 @@ void vp9_change_config(struct VP9_COMP *cpi, const VP9EncoderConfig *oxcf) {
rc->avg_frame_bandwidth < (rc->last_avg_frame_bandwidth >> 1)) {
rc->rc_1_frame = 0;
rc->rc_2_frame = 0;
rc->bits_off_target = rc->optimal_buffer_level;
rc->buffer_level = rc->optimal_buffer_level;
}
}
}

2
vp9/encoder/vp9_svc_layercontext.c
View File

@ -881,6 +881,8 @@ void vp9_svc_check_reset_layer_rc_flag(VP9_COMP *const cpi) {
RATE_CONTROL *lrc = &lc->rc;
lrc->rc_1_frame = 0;
lrc->rc_2_frame = 0;
lrc->bits_off_target = lrc->optimal_buffer_level;
lrc->buffer_level = lrc->optimal_buffer_level;
}
}
}