> On May 19, 2023, at 11:17, xufuji456 <[email protected]> wrote:
>
> When using low-latency mode, it eliminates frame reordering
> and follows a one-in-one-out encoding mode
>
> Signed-off-by: xufuji456 <[email protected]>
> ---
> 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);
Please use compat_keys in case of
kVTVideoEncoderSpecification_EnableLowLatencyRateControl
isn’t available.
> +
> + 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)
>
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