[FFmpeg-devel] [PATCH] avcodec/videotoolboxenc: add low-latency encoding
xufuji456
839789740 at qq.com
Fri May 19 06:17:03 EEST 2023
When using low-latency mode, it eliminates frame reordering
and follows a one-in-one-out encoding mode
Signed-off-by: xufuji456 <839789740 at qq.com>
---
libavcodec/videotoolboxenc.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/libavcodec/videotoolboxenc.c b/libavcodec/videotoolboxenc.c
index c6f22723d6..ae1ef32b2d 100644
--- a/libavcodec/videotoolboxenc.c
+++ b/libavcodec/videotoolboxenc.c
@@ -1441,6 +1441,17 @@ 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,
+ 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);
--
2.32.0 (Apple Git-132)
More information about the ffmpeg-devel
mailing list