PR #20453 opened by cgutman
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20453
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20453.patch
`kVTVideoEncoderSpecification_EnableLowLatencyRateControl` was supported only
for H.264 on Intel Macs, but it can be used with both H.264 and HEVC on Apple
Silicon.
>From d59660b787c940076a87583597bb8cbf28015d91 Mon Sep 17 00:00:00 2001
From: Cameron Gutman <aicomman...@gmail.com>
Date: Fri, 5 Sep 2025 23:42:52 -0500
Subject: [PATCH] avcodec/videotoolboxenc: allow low latency RC with HEVC
It is supported only for H.264 on Intel Macs, but it can be used with
both H.264 and HEVC on Apple Silicon.
Signed-off-by: Cameron Gutman <aicomman...@gmail.com>
---
libavcodec/videotoolboxenc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libavcodec/videotoolboxenc.c b/libavcodec/videotoolboxenc.c
index e423da6933..f0d3a15897 100644
--- a/libavcodec/videotoolboxenc.c
+++ b/libavcodec/videotoolboxenc.c
@@ -1709,7 +1709,8 @@ static int vtenc_configure_encoder(AVCodecContext *avctx)
#endif
// 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) {
+ if ((avctx->flags & AV_CODEC_FLAG_LOW_DELAY) &&
+ ((avctx->codec_id == AV_CODEC_ID_H264) || (TARGET_CPU_ARM64 &&
avctx->codec_id == AV_CODEC_ID_HEVC))) {
CFDictionarySetValue(enc_info,
compat_keys.kVTVideoEncoderSpecification_EnableLowLatencyRateControl,
kCFBooleanTrue);
--
2.49.1
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