@@ -105,6 +105,7 @@ static struct{
CFStringRef kVTVideoEncoderSpecification_EnableHardwareAcceleratedVideoEncoder;
CFStringRef kVTVideoEncoderSpecification_RequireHardwareAcceleratedVideoEncoder;
+ CFStringRef kVTVideoEncoderSpecification_EnableLowLatencyRateControl;
getParameterSetAtIndex CMVideoFormatDescriptionGetHEVCParameterSetAtIndex;
} compat_keys;
@@ -171,6 +172,8 @@ static void loadVTEncSymbols(void){
"EnableHardwareAcceleratedVideoEncoder");
GET_SYM(kVTVideoEncoderSpecification_RequireHardwareAcceleratedVideoEncoder,
"RequireHardwareAcceleratedVideoEncoder");
+ GET_SYM(kVTVideoEncoderSpecification_EnableLowLatencyRateControl,
+ "EnableLowLatencyRateControl");
}
typedef enum VT_H264Profile {
@@ -1441,6 +1444,17 @@ static int vtenc_create_encoder(AVCodecContext *avctx,
}
}
+ // low-latency mode: eliminate frame reordering, follow a one-in-one-out encoding mode
+ if ((avctx->flags & AV_CODEC_FLAG_LOW_DELAY) && avctx->codec_id == AV_CODEC_ID_H264) {
+ status = VTSessionSetProperty(vtctx->session,
+ compat_keys.kVTVideoEncoderSpecification_EnableLowLatencyRateControl,
+ kCFBooleanTrue);
+
+ if (status) {
+ av_log(avctx, AV_LOG_ERROR, "Error setting low latency property: %d\n", status);
+ }
+ }
+
status = VTCompressionSessionPrepareToEncodeFrames(vtctx->session);
if (status) {
av_log(avctx, AV_LOG_ERROR, "Error: cannot prepare encoder: %d\n", status);
When using low-latency mode, it eliminates frame reordering and follows a one-in-one-out encoding mode Signed-off-by: xufuji456 <839789740@qq.com> --- libavcodec/videotoolboxenc.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)